FCC ID: C8LB6100-S2 VHF fixed ground based aeronautical receiver

 

PAE T6T TRANSMITTER and T6R RECEIVER, VHF Multimode Digital Radio (MDR) TECHNICAL INFORMATION PAE T6T TRANSMITTER and T6R RECEIVER, VHF Multimode Digital Radio (MDR) GENERAL - T6T and T6R Frequency range Channel spacing:

AM-voice AM data Modes:

Options Mode memory slots Supported standards Frequency stability:

Option 1 118 to 136.975 MHz 8.33 kHz and 25 kHz 25 kHz A3E AM-voice AM-MSK VDL-2 VDL-3 4 ICAO Annex 10 EN 301 841-1 EN 300 676

<1 ppm

<0.3 ppm (T6T only) CONTROL - T6T and T6R Full control and monitoring of the T6T and T6R can be carried out locally using the front panel controls and display, from a computer connected to the front panel, or remotely via a RS422 serial port from PAE MARC or similar. Pre-set channels Channel settings 100 Frequency, channel spacing, memory assignment, frequency offset Prevents unauthorised adjustment Rotary encoder and backlit multifunction display provide menu driven control of all radio operating parameters and BIT functions Front panel lock out Local control facilities TRANSMIT - T6T Carrier power Modulation VSWR mismatch Offset carrier:

2-offset carrier 3-offset carrier 4-offset carrier 5-offset carrier Oscillator detect Harmonic outputs RECEIVE - T6R Sensitivity Selectivity:

8.33 kHz 25 kHz Squelch 5 to 50 W in 1 W steps 0 to 100% in 1% steps Full power into VSWR of 2.5:1 Infinite VSWR without damage 5 kHz fc and 7.3 kHz 2.5 kHz and 7.5 kHz fc, 4 kHz and 8 kHz (Option 1 only) Monitors installed oscillator. Inhibits offset programming if invalid oscillator fitted

<-36 dBm

-107 dBm for 10 dB (S+N)/N

<6 dB at 3.5 kHz

>70 dB at 8.33 kHz

>80 dB at 25 kHz

<6 dB at 11 kHz

>80 dB at 25 kHz Threshold adjustable in 1 dB steps for RF input levels from -114 dBm to

-60 dBm [equivalent to <6 to >30 dB

(S+N)/N]. Incorporates Digital Coherent Mute (DCM) technology to dynamically filter on-channel interference. DCM automatically mitigates co-location interference to ensure the squelch opens whenever an input signal exceeds the set threshold and has a positive (S+N)/N ratio Ref oscillator adjust Duty cycle Operating temperature Storage temperature Power consumption:

T6T - transmit T6T - standby T6R - receive T6R - standby Supplies:

ac dc Remote control ports:

Facilities MARC HDLC Spurious outputs VOGAD Tx mute Time out Audio distortion Audio bandwidth:

8.33 kHz 25 kHz Audio interface:

Line input Tape output AGC RF AGC audio Antenna radiation Audio distortion Audio bandwidth:

8.33 kHz 25 kHz Audio interface:

Line output Loudspeaker Tape output From front panel rotary encoder 100% continuous transmit

-20 to +55C

-30 to +70C ac 330 VA 20 VA 35 VA 20 VA dc 10 A 0.4 A 1 A 0.4 A T6T: 110/120/220/230/240 V (10%) 48 to 62 Hz T6R: 99 to 264 V 48 to 62 Hz 21.6 to 32 V LED indicators for standby, ready, alarm, receive (on T6R) and transmit (on T6T) Mic/headset/diagnostic port for local operation and programming from computer via RS232 serial link Coaxial connector for monitoring reference oscillator frequency Audio and control for AM operation RS422 serial port for control of radio from MARC or other compatible system Serial interface for VDL operation

<-46 dBm

<10% change in modulation depth for 30 dB change in input level 5 dB below VOGAD threshold Off, or 2 s to 510 s in 2 s steps

<5% THD 350 Hz to 2500 Hz 300 Hz to 3400 Hz

-40 dBm to 0 dBm in 1 dB steps

-10 dBm

<3 dB change in audio output for RF signals between -107 dBm and +10 dBm

<1 dB change in audio output for modulation depth change between 90% and 30%. Automatically maintains audio at the 90% modulation equivalent level for maximum fidelity

<-73 dBm

<5% THD 350 Hz to 2500 Hz 300 Hz to 3400 Hz

-30 dBm to +10 dBm in 1 dB steps 1 W

-10 dBm MECHANICAL - T6T and T6R Dimensions T6T: 89(H) x 483(W) x 450(D) mm T6R: 89(H) x 483(W) x 430(D) mm Weight RF connectors T6T: 17 kg T6R: 6 kg N-type socket ORDERING INFORMATION - T6T and T6R T6T transmitter:

Part No. B6350 Option 1 (high stab oscillator) Part No. B6350OPT1 T6R receiver Part No. B6100 T6T transmitter user guide T6R receiver user guide Microphone Headset End-fed dipole antenna Part No. 31-360000TX Part No. 31-360000RX Part No. 24-11030301 Part No. 24-12002801 Part No. B2080 Park Air Systems reserves the right to amend specifications in the light of continuing development - 012-1 A subsidiary of Northrop Grumman Corporation Park Air Systems Ltd, Northfields, Market Deeping, Peterborough, England, PE6 8UE Tel: +44 1778 345434 Fax: +44 1778 342877 Email: sales@parkairsystems.com www.parkairsystems.com The PAE T6T Transmitter and T6R Receiver PAE T6 Series for advanced airspace communications VHF 118 to 137 MHz Multimode Digital Radio (MDR) 8.33 kHz and 25 kHz channel spacing 50 W RF transmit output power Digital Coherent Mute (DCM) technology Five-offset carrier capability Analogue and digital operation Extensive remote control facilities PAE T6T TRANSMITTER and T6R RECEIVER, VHF Multimode Digital Radio (MDR) The PAE T6T Transmitter and T6R Receiver PAE T6 Series for advanced airspace communications The PAE T6T and T6R multimode digital radios are designed to provide ground-to-air communications for professional applications in airport and en route centres. The radios will support both voice and ICAO defined data modes. The T6 series incorporates 8.33 kHz and 25 kHz channel spacing. The radios recognize frequencies entered in ICAO format and automatically adjust to the correct channel spacing. For multichannel operation, any combination of 8.33 kHz and 25 kHz channel spacing can be programmed. A 100 channel memory allows immediate recall of stored frequencies. Front panel operation can be

locked to prevent unauthorised adjustment of radio parameters. The T6T supports ICAO defined offset carrier operation. The standard master oscillator supports two, three and four-offset carrier operation, the optional high stability oscillator also allows five-offset carrier operation. The radio detects the oscillator fitted and will inhibit five-offset carrier operation if the high stability option is not detected. Careful implementation of DSP techniques significantly reduces the component count within the radios. This leads to increased reliability and reduced logistic costs. All modulation and demodulation processes are carried out using DSP algorithms that provide consistent long-term performance to further enhance equipment reliability. All adjustable parameters within the radios can be modified using the front panel controls, or from a computer connected to the headset/diagnostics port, eliminating the need to remove equipment covers during the operational life of the radio. The radios can be operated locally using the front panel controls, or remotely via flexible control interfaces. STANDBY mode allows the radios to be powered on and off remotely to ensure minimal current drain on local power supplies. The use of innovative RF engineering allied to sophisticated DSP technology provides class leading performance. The advanced design of the T6 series transmitter and receiver allows operation in demanding co-site conditions, reducing the need for external filters. The T6T transmitter employs a sophisticated feedback technique that minimizes spectral noise and enhances signal purity. The power amplifier is designed for optimum performance and maximum reliability and will support continuous operation applications. The T6R receiver circuitry benefits from unique DSP implemented Digital Coherent Mute (DCM) technology. DCM uses specially developed algorithms that monitor on-channel activity and dynamically filter unwanted interfering signals. The receiver front-end has exceptional signal handling properties that ensure rejection of unwanted off-channel signals while maintaining excellent low level wanted signal performance. Comprehensive Built-In Test (BIT) monitors both static and dynamic parameters. Results can be viewed on the front panel LCD and summarized via READY and ALARM indicators. All BIT data is available for remote monitoring via serial ports, and transmitters and receivers can be readily networked for remote monitoring using the PAE Multi-Access Remote Control (MARC) or similar systems.

 

 

Back to Main Page T6R VHF Multimode Receiver This documentation is applicable to receivers at Mod strike 7 Select Topic Specification Operation Installation Maintenance Approvals and Standards Back to Receiver Main Page Approvals and Standards T6R VHF Receivers Approvals:

The equipment is designed to meet the essential requirements of Directives 1999/5/EC, 89/336EEC as amended by Directive 93/68/EEC, and 72/23/EEC. Standards:

The following standards are applied:

EMC EN 301 489-1; EN 301 489-22. Health & Safety, EN 60950, CAN/CSA-C22.2 No. 60950, UL 60950. Radio EN 300 676, IC RSS141, FCC part 15. Telecom CS-03. FCC Statement:

This device has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna. Increase the separation between the equipment and the receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the supplier or an experienced radio/TV technician for help. Operation on 8.33 kHz channel spacing is restricted to European customers. Back to Transmitter Main Page Specification This section gives the specification applicable to the T6T VHF Multimode Transmitter operating in AM modes, Mode 2 and Mode 3. All radios operate in AM-voice mode. Additional software must be loaded to allow AM-MSK, Mode 2 and Mode 3. Back to Transmitter Main Page General Specification The general specification applies to a transmitter irrespective of the selected operating mode. Separate listings are given for AM modes, Mode 2 and Mode 3. Variants The T6T VHF Multimode Transmitter is available in the variants as listed in Table 1. Table 1 Transmitter Variants Description Part Number Frequency Range Special Applications 50 watt standard frequency coverage transmitter 50 watt extended frequency coverage transmitter 50 watt, high stability, standard frequency coverage transmitter 50 watt, high stability, extended frequency coverage transmitter B6350/NB/50 118 to 136.975 MHz B6350/WB/50 112 to 155.975 MHz B6350HS/NB/50 118 to 136.975 MHz B6350HS/WB/50 112 to 155.975 MHz Supports 2, 3 and 4-offset carrier operation Supports 2, 3 and 4-offset carrier operation Supports 5-offset carrier operation Supports 5-offset carrier operation Frequency accuracy All variants except HS HS variants Better than 1 ppm. Better than 0.3 ppm. Number of Channels All variants The transmitter has a multichannel capability. 100 channels can be stored and recalled. Power Requirements The transmitter operates from an ac mains supply, or a dc input supply. When both supplies are connected, the dc input acts as an automatic backup for the ac mains. ac input supply dc input supply The transmitter operates from a 48 to 62 Hz single-phase ac supply and automatically adjusts to operate from any supply voltage ranging from 110 Vac to 240 Vac 10%. The power consumption figures are given in Table 2. The transmitter operates from a dc input supply between 21.6 and 32 V (measured at the radios input). Current loading is given in Table 2. T6T 50 W VHF Transmitter Page 2 Specification Back to Transmitter Main Page Table 2 Power Consumption Requirement Normal Operation ac dc Maximum 500 VA Not Transmitting 60 VA 12 A 1 A Dimensions and Weight The dimensions and weight of the transmitter are:

Width Height Depth Weight Environmental Temperature range Humidity Altitude 483 mm (19 inches). 88.9 mm (3.5 inches). The height occupies 2U of equipment cabinet space. 430 mm (16.9 inches) measured from front panel to rear panel. 450 mm (17.8 inches) measured from front panel to rear of fan. 13.5 kg (29.76 pounds). The transmitter operates to specification across the temperature range of -20C to +55C. The transmitter can be stored at temperatures ranging from

-30C to +70C without causing any damage. The transmitter operates to specification at a relative humidity between 5% and 90% non-condensing. The radios operate to specification up to 15,000 feet. Additionally the equipment is capable of storage at altitudes up to 50,000 feet without damage. Shock and vibration The radios comply with shock and vibration protection MIL-STD-810E, method 516.4, procedure VI - Bench Handling. Ventilation Warm up time The transmitters are cooled by an integral fan, which normally runs at half speed. At an RF PA temperature of 45C this is increased to full speed and at 40C it reduces to half speed again. The transmitters also include an additional temperature controlled fan contained in the power supply. All variants are fully operational to specification within 20 seconds after switch on except the T6T HS, which is fully operational within 20 seconds but can takes up to 10 minutes to achieve frequency accuracy for offset carrier. T6T 50 W VHF Transmitter Page 3 Specification Back to Transmitter Main Page AM Modes The transmitter can operate in AM-Voice mode (standard) and AM-MSK mode (optional). The following specifications apply to both modes unless stated otherwise. Transmitter RF Characteristics RF Power Output The RF carrier output power is adjustable in 1 W steps from 5 W to 50 W (as an option, the maximum selectable power can be limited). Output power is automatically controlled under the following conditions:

Frequency range Low supply voltage High VSWR High RF PA temperature Variations in power remain within -0 to +1 dB over the operational frequency range. Variations in power remain within 1 dB for supply voltages between 24 Vdc and 32 Vdc. Loop error can reduce power progressively by up to 3 dB. Variations in power remain within 1 dB into a VSWR of up to 2.5:1. At a VSWR greater than this the output power may be reduced by 10 dB 1 dB. If the RF PA temperature sensor exceeds 80C the output power is reduced by 3 dB 1 dB. If the RF PA temperature sensor exceeds 90C the transmitter is de-keyed and automatically re-keyed at 70C. Duty Cycle All variants Channel Spacing AM-Voice mode 100% continuous operation. The transmitters are capable of both 25 kHz channel spacing and 8.33 kHz channel spacing. AM-MSK mode 25 kHz. Offset Carrier Non-HS variants (AM-Voice) The non-HS T6T is capable of offsetting the carrier frequency to provide 2, 3 and 4 carrier offset. HS variants (AM-Voice) The HS T6T is capable of offsetting the carrier frequency to provide 2, 3, 4 and 5 carrier offset. AM-MSK mode Offset carrier is not available. Harmonic Outputs All variants Second harmonic outputs are less than -36 dBm, third harmonic outputs are less than -46 dBm and fourth harmonic outputs and above up to 4 GHz, are less than -56 dBm. T6T 50 W VHF Transmitter Page 4 Specification Back to Transmitter Main Page Spurious Outputs All variants Intermodulation All variants The spurious outputs are less than -46 dBm for modulation depths up to 90%, measured at greater than 500 kHz from carrier in the frequency range 9 kHz to 4 GHz. There are no coherent spurious outputs above the spectral mask at less than 500 kHz. Intermodulation products, caused by an interfering signal with the same power as the transmitter isolated by 30 dB, are at least -40 dBc at 150 kHz and -50 dBc at 500 kHz. Transmitter Modulation Characteristics The transmitter modulation characteristics are as follows:

Mode AM-Voice AM-MSK Modulation Depth All variants Hum and Noise All variants Frequency Response 25 kHz channel spacing 8.33 kHz channel spacing Distortion 25 kHz channel spacing 8.33 kHz channel spacing AM-Voice mode uses Double Sideband (DSB) Amplitude Modulation

(AM) full carrier; emission designator 6K80A3EJN for 25 kHz channels and 5K00A3EJN for 8.33 kHz channels. AM-MSK mode uses Double Sideband (DSB) Amplitude Modulation

(AM) full carrier; emission designator 13K0A2DJN. The transmitter is capable of modulation depths up to 95%. The hum and noise is more than 45 dB below the signal level for line input levels <-13 dBm, and more than 50 dB below the signal level for line input levels -13 dBm, for a carrier modulated by a 1 kHz signal with a modulation depth of 90%. AM-Voice and AM-MSK: The variation in frequency response with reference to a 1 kHz signal is within +0.5 dB and -1.5 dB across the frequency range 300 to 3400 Hz. The response is also less than -20 dB at 100 Hz and below, and less than -30 dB at 4 kHz and above. AM-Voice only: The variation in frequency response with reference to a 1 kHz signal is within +0.5 dB and -1.5 dB across the frequency range 350 Hz to 2500 Hz. The response is also less than -10 dB at 100 Hz and below, and less than -30 dB at 3200 Hz and above. The total harmonic distortion is less than 5% due to signals with a modulation depth of 90%, within the frequency range 300 Hz to 3400 Hz. AM-Voice only: The total harmonic distortion is less than 5% due to signals with a modulation depth of 90%, within the frequency range 350 Hz to 2500 Hz. T6T 50 W VHF Transmitter Page 5 Specification Back to Transmitter Main Page Residual FM All variants VOGAD AM-Voice For a test signal of 1 kHz set at 80% modulation depth applied to the line input of the transmitter, the unwanted peak frequency modulation does not exceed 500 Hz. The VOGAD has an operational range of 30 dB. The VOGAD can be disabled. AM-MSK The VOGAD is disabled. Mute AM-Voice The mute level is set at 15 dB below the average speech line level setting. The mute can be disabled. AM-MSK The mute is disabled. Differential Group Delay AM-MSK There is less than 60 s differential group delay for signals in the range 1200 to 2400 Hz. Transmitter Control Transmitter control characteristics are as follows:

Audio Inputs All variants PTT Time Out All variants Voice can be connected to the transmitter via the front panel microphone connector. Voice can also be connected via the line inputs. Line level setting from -30 to +10 dBm. The time out period is adjustable from 2 to 510 seconds in 2 second steps or can be disabled. T6T 50 W VHF Transmitter Page 6 Specification Back to Transmitter Main Page Mode 2 This section gives the transmitters specification applicable to Mode 2 operation. Mode 2 parameters are identical to AM-Voice mode parameters with the following exceptions:

RF Power Rise Time All models RF Power Decay Time All models The transmitter produces more than 90% of full power output within the first 2 symbols of the power stabilization segment, which is the first segment of the training sequence and consists of 4 symbols each representing 000. The output power decays by more than 20 dB within 2.5 symbols of the middle of the final symbol. Channel Spacing All models 25 kHz channel spacing only. Transmitter Modulation Characteristics Mode All models Modulation Rate All models RMS Phase Error All models Phase Acceleration All models Mode 2 uses Carrier Sense Multiple Access (CSMA) differentially encoded 8-phase shift keying (D8PSK), using a raised cosine filter with =0.6 (nominal value), emission designator 14K0G1DE. Information is differentially encoded with 3 bits per symbol transmitted as changes in phase rather than absolute phase. The data stream is divided into groups of 3 consecutive data bits, least significant bit first. Zeros are padded to the end of transmissions if needed for the final channel symbol. The symbol rate is 10,500 symbols/second (0.005%), resulting in a nominal bit rate of 31,500 bits/s. The RMS phase error is less than 3. The error vector magnitude is less than 6%. The total frequency change during the transmission of the unique word is less than 10 Hz. After this, the phase acceleration is less than 500 Hz/s. T6T 50 W VHF Transmitter Page 7 Specification Back to Transmitter Main Page Mode 3 This section gives the transmitters specification applicable to Mode 3 operation. Mode 3 parameters are identical to AM-Voice mode parameters with the following exceptions:

RF Power Rise Time All models RF Power Decay Time All models The transmitter produces more than 90% of full power output within the first 2 symbols of the power stabilization segment, which is the first segment of the training sequence and consists of 4 symbols each representing 000. The output power decays by more than 20 dB within 2.5 symbols of the middle of the final symbol. Channel Spacing All models 25 kHz channel spacing only. Transmitter Modulation Characteristics Mode All models Modulation Rate All models RMS Phase Error All models Phase Acceleration All models End of document Mode 3 uses Time Division Multiple Access (TDMA) differentially encoded 8-phase shift keying (D8PSK), using a raised cosine filter with =0.6 (nominal value), emission designator 14K0G7WET. Information is differentially encoded with 3 bits per symbol transmitted as changes in phase rather than absolute phase. The data stream is divided into groups of 3 consecutive data bits, least significant bit first. Zeros are padded to the end of transmissions if needed for the final channel symbol. The symbol rate is 10,500 symbols/second (0.005%), resulting in a nominal bit rate of 31,500 bits/s. The RMS phase error is less than 3. The error vector magnitude is less than 6%. The total frequency change during the transmission of the unique word is less than 10 Hz. After this, the phase acceleration is less than 500 Hz/s. T6T 50 W VHF Transmitter Page 8 Specification Back to Transmitter Main Page Operation This document describes the controls, indicators, setting up and operating instructions applicable to the T6T VHF Multimode Transmitter. Back to Transmitter Main Page Controls, Indicators and Front Panel Connectors This part details the purpose of all controls and indicators of the T6T transmitters. Front Panel The front panels controls, indicators and connectors are shown below and detailed in the following paragraphs. LCD Scroll/Select Switch READY ALARM TRANSMIT STANDBY F r e q 1 1 8 .0 0 0 M H z C h 1 0 0 + 7 . 3 k H z M o d e A M V o i c e 1 P w r REFERENCE SCROLL/

SELECT MICROPHONE/

DIAGNOSTICS Scroll/Select Switch and LCD The Scroll/Select switch is used in conjunction with the LCD to select most of the transmitter's operational settings. Use of the switch and LCD is fully detailed in this section applicable to the particular operating mode. During normal operation, the LCD shows the operating frequency, the channel number (if the channel store facility is used), the carrier offset (if used), and displays a graphical representation of instantaneous peak power. The example LCD screen above shows the transmitter operating on 118.000 MHz; the frequency has been preset as channel 100 and offset at +7.3 kHz. Ready Indicator A green indicator that lights when the transmitter is ready for use and no BIT faults have been detected. Transmit Indicator An amber indicator that lights when the transmit circuit is keyed and producing output power. Alarm Indicator A red indicator that either flashes, or lights, when a BIT fault has been detected. BIT indications are classified as either Alarms or Alerts. If an alert condition is detected, the Alarm indicator flashes, the Ready indicator remains lit, and the transmitter remains operational. A BIT alert is indicated if:

If the transmitter RF output power has reduced from its setting by more than 1 dB but not more than 3 dB. If the supply volts falls below a pre-defined level. Any other BIT condition results in an alarm. When detected, the Alarm indicator lights and the Ready indicator becomes unlit; the transmitter cannot be used. T6T VHF 50 W Transmitter Page 2 Operation Back to Transmitter Main Page Standby Indicator A red indicator that lights when the transmitter is in standby mode. When in standby mode, most of the radio's circuits are inactive, the front panel LCD is blanked, and the transmitter cannot be keyed. Standby mode is selected and deselected using the front panel Scroll/Select switch and LCD, by initiating an instruction through a MARC system, through a T6 controller or through the VFP. For details of front panel selection and deselection see page 13. Reference Connector An SMB jack socket that allows a frequency counter to monitor the transmitter's reference frequency. This connector is used only for maintenance purposes. The instructions for checking and adjusting the reference frequency are given in the Maintenance section. Microphone/Diagnostics Connector A dual purpose connector that allows either a microphone, or a PC, to be connected to the transmitter. The connector is a 7-pin self-locking DIN socket; the pin-out is shown in Table 1. A microphone is fitted to this connector to enable the transmitter to be operated in AM local mode. The connections are detailed in Table 1. A PC can also be connected to allow the VFP to be displayed. Using the VFP is detailed in the Maintenance section. The PC connections at the transmitter are shown in Table 2 on page 4. Viewed from front Table 1 Microphone/Diagnostics Connector - Audio Connections Pin Number Signal Input or Output Description 1 3 5 6 7 Microphone ground

0 V. Microphone PTT Sidetone Input Output 0 V to PTT. 0 to 3 V pk-pk. Microphone input Input 2 to 35 mV rms on Passive setting and 8 to 140 mV rms on Active setting to remain in VOGAD range. Ground

0 V. T6T VHF 50 W Transmitter Page 3 Operation Back to Transmitter Main Page Table 2 Microphone/Diagnostics Connector - PC Connections Pin Number Signal Input or Output Description 2 4 7 Transmit data Output Receive data Input RS232, 115200 baud, 8 data bits, 1 stop bit, no parity, no handshaking. RS232, 115200 baud, 8 data bits, 1 stop bit, no parity, no handshaking. Ground

0 V. Rear Panel Power Switch The rear panel's power switch is a 2-way rocker switch used to select between power on, and standby. WARNING Dangerous Voltages When the POWER SWITCH is set to the Standby position, dangerous voltages are still present in the transmitter's internal power supply circuitry. To ensure safe working, the transmitter must be isolated from the ac and dc input supplies.

= On

= Standby T6T VHF 50 W Transmitter Page 4 Operation Back to Transmitter Main Page Setting Up and Operation Introduction Setting up the transmitter involves selecting various parameters using the Virtual Front Panel (VFP), through a Multi-Access Remote Control (MARC) system, from a T6 controller, or from the transmitters front panel. The transmitter can be configured for remote or local use. Table 9 on page 30 details the functions and parameters that can be set from all these sources. The rest of this document details how to configure the transmitter from the front panel, and how to operate the radio in local mode. Selecting most of the transmitter's operational settings is carried out using the front panel Scroll/Select switch and the LCD (see the illustration below). No attempt to set up the transmitter should be made until the transmitter has been installed as per the installation procedures given in the Installation section. Normal Operation During normal operation, the LCD displays the Main screen. This screen shows the operating frequency, the channel number (if the channel store facility is used), the carrier offset (if used), and displays a graphical representation of output power when the transmitter is keyed. If the transmitter has been set to Standby mode, which is shown by the front panel Standby indicator being lit, the LCD is blanked. LCD Scroll/Select Switch READY ALARM TRANSMIT STANDBY F r e q 1 1 8 .0 0 0 M H z C h 1 0 0 + 7 . 3 k H z M o d e A M V o i c e 1 P w r REFERENCE SCROLL/

SELECT MICROPHONE/

DIAGNOSTICS Using the Scroll/Select Switch The Scroll/Select switch (referred to throughout this section as the Switch) is used to leave the Main screen and display the Control screen (see page 8). Further use of the Switch displays various selection menus and allows the required parameters to be set. The switch has three actions: it can be turned clockwise, anti-clockwise, or momentarily pushed in. T6T VHF 50 W Transmitter Page 5 Operation Back to Transmitter Main Page Screen Protocol The following protocol is applicable to all screens described in this document. Main Screen During normal operation, the Main screen (an example of which is shown below whilst the transmitter is transmitting) is displayed. F r e q 1 1 8 . 0 0 0 M H z C h 1 0 0

+ 7 . 3 k H z M o d e A M V o i c e P w r I I I I I I I I I I Switch Time out

Back Exit Refers to the front panel Scroll/Select switch. The switch is turned clockwise to scroll through fields from left to right, and from top to bottom. The switch is turned anti-clockwise to scroll through fields from right to left, and from bottom to top. The switch is pressed to make a selection. If during any setting up procedure the Scroll/Select switch is not operated for 30 seconds, the display returns to the Main screen. If editing any parameter has not been completed, the transmitter stays on the original setting. Indicates more fields are available other than those currently displayed. To access those fields, turn the switch clockwise through the last displayed field. Indicates more fields are available other than those currently displayed. To access those fields, turn the switch anti-clockwise through the first displayed field. When Back is selected, you are returned to the previous menu. When Exit is selected, you are returned to the Main screen. Menu System The front panel control of the radio is implemented through a hierarchical menu system as shown on the following page. T6T VHF 50 W Transmitter Page 6 Operation F r e q 1 1 8 . 0 0 0 M H z C h 1 0 0 M o d e A M V o i c e P w r I I I I I I I I I I Back to Transmitter Main Page Main Screen

(Example) Displayed during normal transmitter operation Control Screen Configure the transmitter operating parameters, access the BIT facility or view the software configuration. Menu Lock Screen

(see page 8) Frequency Channel Settings BIT S/W Config Standby Set the transmitter operating frequency Set or recall up to 100 preset frequency channels Set the transmitter operational settings Initiate a BIT test and view results View the transmitter software configuration Enter or Exit standby mode Backlight Adjust the displays backlight Ref Freq Adjust the transmitter reference frequency Band Edges Set up the transmitter band edges Mode and Mode Settings Select Mode Polarities Set the active polarity for certain hardwire connections AM-Voice Mode Settings

(see page 16) AM-MSK Mode Settings

(see page 18) Digital Modes

(see page 19) Menu System T6T VHF 50 W Transmitter Page 7 Operation Back to Transmitter Main Page Menu Lock Screen A security facility available only from the VFP allows the transmitter's front panel to be locked. When this facility is active, no operational settings can be made from the front panel until an unlock command is sent from the VFP. The following screen is displayed when lock is active, and the front panel switch is pressed. S E C U R I T Y M E S S A G E F r o n t P a n e l L o c k e d O K To exit the system lock screen:

Select OK, then press the switch. You are returned to the Main screen. or, Wait for the 30 second time-out to expire. You are returned to the Main screen. Control Screen The Control screen is entered from the Main screen by pressing the switch. The following screen is displayed:

Change the transmitters operating frequency. Store or recall preset channel frequencies. Select operating mode and mode settings. F r e q u e n c y C h a n n e l S e t E x i t t i n g s

Initiate a BIT test and view results. View software configuration. Enter or exit standby mode. B I T S / W C o n f i g S t a n d b y E x i t

T6T VHF 50 W Transmitter Page 8 Operation Back to Transmitter Main Page Notes for Setting Up the Transmitter The following notes should be read before setting up the transmitter. They advise on the special frequency display when using 8.33 kHz channel spacing, and give guidance on the optimum line level settings. Note that for operation in the United States of America, this equipment is certified only for operation using 25 kHz channel spacing. Front Panel Display for 25 kHz and 8.33 kHz Channel Spacing When setting the operating frequency of the transmitter and 8.33 kHz channel spacing is required, the displayed frequency differs from the actual channel frequency. Table 3 shows the pattern used for 25 kHz and 8.33 kHz spaced channel frequencies from 118.000 MHz to 118.141 MHz. The pattern is the same for any frequency within the transmitter's frequency range. The display conforms to ICAO convention for 8.33 kHz operation. Table 3 25 kHz and 8.33 kHz Channel Spacing Displays Actual Frequency

(to 4 decimal places) Channel Spacing Displayed Frequency at Transmitter's Front Panel 118.0000 MHz 118.0000 MHz 118.0083 MHz 118.0166 MHz 118.0250 MHz 118.0250 MHz 118.0333 MHz 118.0416 MHz 118.0500 MHz 118.0500 MHz 118.0583 MHz 118.0666 MHz 118.0750 MHz 118.0750 MHz 118.0833 MHz 118.0916 MHz 118.1000 MHz 118.1000 MHz 118.1083 MHz 118.1166 MHz 118.1250 MHz 118.1250 MHz 118.1333 MHz 118.1416 MHz 25 kHz 8.33 kHz 8.33 kHz 8.33 kHz 25 kHz 8.33 kHz 8.33 kHz 8.33 kHz 25 kHz 8.33 kHz 8.33 kHz 8.33 kHz 25 kHz 8.33 kHz 8.33 kHz 8.33 kHz 25 kHz 8.33 kHz 8.33 kHz 8.33 kHz 25 kHz 8.33 kHz 8.33 kHz 8.33 kHz 118.000 MHz 118.005 MHz 118.010 MHz 118.015 MHz 118.025 MHz 118.030 MHz 118.035 MHz 118.040 MHz 118.050 MHz 118.055 MHz 118.060 MHz 118.065 MHz 118.075 MHz 118.080 MHz 118.085 MHz 118.090 MHz 118.100 MHz 118.105 MHz 118.110 MHz 118.115 MHz 118.125 MHz 118.130 MHz 118.135 MHz 118.140 MHz Line Level Settings The input line level setting displayed on the front panel is equivalent to the average speech level with a peak-to-average ratio of 13 dB. This corresponds to the level specified for the lines. When testing the transmitter using a sine wave, the line input level should be set to 10 dB above the line level setting. The VOGAD and mute thresholds are pre-set at 10 dB and 15 dB respectively below the line level setting. Table 4 shows the relationship between the input line level, VOGAD threshold and mute threshold. T6T VHF 50 W Transmitter Page 9 Operation Back to Transmitter Main Page Table 4 Relationship Between Line Level, VOGAD Threshold and Mute Threshold Line Level Setting

(dBm) Average Speech Level (dBm) Sine Wave Level

(dBm) VOGAD Threshold

(dBm) Mute Threshold

(dBm)

+10

+5 0

-5

-10

-15

-20

-25

-30

+10

+5 0

-5

-10

-15

-20

-25

-30

+20

+15

+10

+5 0

-5

-10

-15

-20 0

-5

-10

-15

-20

-25

-30

-35

-40

-5

-10

-15

-20

-25

-30

-35

-40

-45 Changing the Transmitters Operating Frequency The transmitters frequency can be changed in two ways: either from the frequency screen, or by recalling a preset channel. This procedure details using the Frequency screen. F r e q 1 1 8 . 0 0 0 M H z C a n c e l O K

(1)

(2)

(3) From the Control screen, select frequency to display the Frequency screen. Turn the switch to highlight the digit to be changed, then press the switch. Turn the switch until the required digit is shown, then press the switch.

(4) Repeat until the required frequency is shown, then highlight OK and press the switch.

(5) Only frequencies that fall between the band edge settings can be selected. T6T VHF 50 W Transmitter Page 10 Operation To Store and Recall Frequency Channels Up to 100 frequency channels can be stored in the transmitter. Back to Transmitter Main Page To store a Channel Frequency

(1) to display the Control screen, select From Channel the Channel screen. Highlight Channel, press the switch and then turn it until the required channel number is displayed; press the switch.

(2) Highlight the MHz frequency value

(see Example 2) press the switch and then turn it until the required MHz value is shown. Press the switch.

(3) Highlight the kHz frequency value (see Example 3), press the switch and then turn it until the required kHz value is shown. Press the switch.

(4) Highlight Store and press the switch. The new frequency is now stored in the selected channel number. C h 1 0 0 F r e q 1 2 1 . 5 0 0 M H z R e c a l l B a c k E x Channel Screen - Example 1 i t C h 1 0 0 F r e q 1 1 8 . 0 0 0 M H z S t o r e B a c k E x i t Channel Screen - Example 2 C h 1 0 0 To recall a Stored Frequency Channel F r e q 1 1 8 . 0 0 0 M H z the Control screen, select the Channel to display From Channel screen. preset channel To make the transmitter operate on any frequency, highlight Channel and press the switch. Turn the switch until the required channel is number/frequency displayed, then press the switch. Turn the switch to highlight Recall, then press the switch. Exit the screen. The transmitter now operates on the recalled channel frequency.

(1)

(2)

(3) Notes:

O u t s i d e B a n d E d g e B a c k E x i t Channel Screen - Example 3 C h 1 0 0 F r e q 1 1 8 . 0 0 0 M H z I nn v a l i d f o r M o d e B a c k E x i t Channel Screen - Example 4 If a frequency outside the band edge limits is entered, a message (see Channel Screen -

Example 3) is displayed. If a frequency not valid for the mode of operation is entered, a message (see Channel Screen - Example 4) is displayed. T6T VHF 50 W Transmitter Page 11 Operation Back to Transmitter Main Page To Initiate a BIT Test Use the following procedure to initiate an interruptive BIT test from the transmitter's front panel. A BIT test cannot be initiated while the transmitter is keyed. After a BIT test has been run, the BIT screen is displayed (see AM-Voice and AM-MSK BIT Screen on page 24). An interruptive BIT test cannot be initiated in Mode 2 or Mode 3. During an interruptive BIT test, the transmitter radiates modulated carrier waves at the set power. Users should therefore obtain the necessary authority before initiating a test. If the test is to be carried out with the antenna disconnected, ensure a load is fitted to the transmitter's antenna connector. In order to test the line input stages, an internally generated 1 kHz tone is injected into the line input circuit. Any other audio present on the line input will cause the test to be inaccurate. Therefore the transmitter must not be keyed during the test.

(1) From the Main screen, press the switch to display the Control screen. Turn the switch until BIT is highlighted. Press the switch. B I T S / W C o n f i g S t a n d b y E x i t

(2) Ensure the BIT menu is displayed. Turn the switch until BIT Initiate is highlighted. Press the switch. B I T E T I I n i t i a t e 0 0 0 0 0 :

0 0 h r s A C S u p p l y E x i t O N

(3) During the test, which takes approximately two seconds, the Testing screen is displayed. T e s t i n g P l e a s e W a i t T6T VHF 50 W Transmitter Page 12 Operation

(4) On completion, and if the interruptive test was initiated from the front panel, one of the following screens will be shown. Back to Transmitter Main Page T e s t S t a t u s P A S S

(5) Selecting OK takes the user back to the BIT screen. T e s t S t a t u s F A I L O K O K

(6) Selecting OK takes the user back to the BIT screen. The user can then scroll through the screen to check out transmitter parameters for failure. Standby Mode Standby mode is a power saving feature that can be used for non-operational transmitters. When in standby mode, most of the transmitter's circuits are inactive, the LCD is blanked, and the transmitter cannot be keyed. To put the transmitter into standby mode, use the following procedure. When the transmitter is in Standby mode, the red front panel Standby indicator is lit. To Enter Standby Mode

(1) From the Control screen select Standby.

(2) At the Standby screen, select Yes. E n t e r S t a n d b y ?

(3) Check that the display blanks and the front panel Standby indicator is lit. Y e s N o To Exit Standby Mode

(1) Press the Switch.

(2) Select Yes.

(3) Check that the Main screen is displayed and that the front panel Standby indicator is unlit. E x i t S t a n d b y ?

Y e s N o T6T VHF 50 W Transmitter Page 13 Operation Back to Transmitter Main Page Settings Operational settings for the T6T VHF transmitter are configured at the front panel, through the VFP, and through an associated MARC system (or compatible control system). Some settings can also be made remotely via a T6 controller. The Settings screen is entered from the Control screen. The settings that can be selected at the front panel Settings screen are:

Mode - either AM-Voice, AM-MSK, Mode 2 or Mode 3 Mode Settings - allows the selected mode parameters to be set Polarities Band edges Backlight Reference frequency. Note that the mode selection, reference frequency and backlight are set from this screen. When mode settings, polarities and band edges are selected the user is taken to other screens. M o d e A M V o i c e Select between AM-Voice, AM-MSK, Mode 2 or Mode 3. M o d e S e t t i n g s P o l a r i t i e s E x i t

Select to take you to the mode specific Settings menu. Select to take you to the Polarities menu. B a n d E d g e s R e f F r e q B a c k l i g h t E x i t 5 0 . 0 %

0 3 0 s

Set the transmitters frequency band edges. Align the transmitters reference frequency (Note 1). Adjust the LCDs backlight time out (Note 2). B a c k E x i t Notes:

1.Setting the transmitters reference frequency is a maintenance operation. The current value should not be reset unless the correct test equipment is connected. See the Maintenance section. 2.The LCDs backlight can be set for permanently on, off, or timed to stay on for a period between 15 and 120 seconds. General and mode specific settings, showing default values, are referenced in Table 5 on page 15. Click on any required parameter by page number for further references. T6T VHF 50 W Transmitter Page 14 Operation Back to Transmitter Main Page Table 5 Operational Settings from the Front Panel Parameter Mode Adjustment Range Factory Default Setting Menu lock screen Enter standby mode Exit standby mode Set mode of operation Set polarities Band edges LCD Backlight RF power Audio line in level Inhibit PTT (key) Tx time out Modulation depth Mute VOGAD All All All All AM-voice, AM-MSK All All All AM-voice, AM-MSK AM-voice, AM-MSK AM-voice, AM-MSK AM-voice, AM-MSK AM-voice, AM-MSK AM-voice AM-voice Antenna C/O delay AM-voice Offset Step Mic Key priority Local PTT Remote PTT Remote phantom PTT AM-MSK AM-voice AM-voice AM-voice AM-voice, AM-MSK AM-voice, AM-MSK AM-voice, AM-MSK AM-voice, AM-MSK Locked or unlocked Unlocked Yes or No Yes or No

AM-voice, AM-MSK, Mode 2 or Mode 3 AM-voice STD or INV STD 118.000 to 136.975 MHz or 112.000 to 155.975 MHz 15 to 120 s, On or Off 5 to 50 W

-30 to +10 dBm On or Off On (key), Off (de-key) 2 to 510 s or Off 5 to 95%

On or Off On or Off On or Off 118.000 and 136.975 MHz or 112.000 and 155.975 MHz 30 s 50 W

-13 dBm Off Off 180 s 85%

On On On Off 0, 2.5, 5, 7.3, 7.5 kHz

(additionally, 4 and 8 kHz on HS models) 8.33 kHz, 25 kHz or both Active or Passive Local-Remote or Remote-Local 0 (No offset) 25 kHz Passive Local-Remote Enabled or Disabled Enabled Enabled or Disabled Enabled Enabled or Disabled Enabled Further Reference page 8 page 13 page 13 page 14 page 20 page 28 page 14 page 16 page 16 and page 18 page 16 and page 18 page 16 and page 18 page 16 and page 18 page 16 and page 18 page 16 page 16 page 16 page 18 page 17 page 17 page 17 page 17 and page 18 page 17 and page 18 page 17 and page 18 page 17 and page 18 T6T VHF 50 W Transmitter Page 15 Operation AM Voice Settings Procedure During this procedure, the following parameters, applicable to AM-voice operation, can be set:

Back to Transmitter Main Page RF power output Audio line input level Inhibit PTT on (key) or off (de-key) Transmitter time out Modulation depth Mute (on or off) VOGAD (on or off) Antenna c/o delay (on or off) Offset Step Mic Key priority (local or remote) Enable or disable local PTT Enable or disable remote PTT Enable or disable remote phantom PTT. AM Voice Mode Settings Screen The AM-voice mode setting screen is accessed from the Settings screen. Use the Scroll/Select switch to select the parameter, then enter the required setting(s). Adjustments P o w e r 5 0 W RF power between 5 W to 50 W. L i n e I n

- 1 3 d B m Audio line in level between -30 to +10 dBm. I n h i b i t E x i t O F F

On or Off. P T T O F F On (key), Off (de-key). T X T i m e o u t 1 8 0 s 2 to 510 s. M o d D e p t h 8 5 %

5 to 95%. E x i t

M u t e V O G A D A n t C / O D e l E x i t

On or Off. On or Off. On or Off. O N O N O N

T6T VHF 50 W Transmitter Page 16 Operation Back to Transmitter Main Page f s e t 0 . 0 k H z 0, 2.5, 5, 7.3, 7.5, (or 4, 8 HS only) kHz. Adjustments O f S t M i e p c E x i t 2 5 k H z 25 kHz, 8.33 kHz or both. P A S S I V E

Active or Passive. K e y P r i o r i t y L - R L o c a l P T T R e m o t e P T T E x i t

E N E N

Local-remote or Remote-local. Enabled or Disabled. Enabled or Disabled. R e m P h a n P T T E N B a c k E x i t

Enabled or Disabled. Return to screen. T6T VHF 50 W Transmitter Page 17 Operation AM-MSK Mode Settings Procedure During this procedure, the following parameters, applicable to AM MSK operation, can be set:

Back to Transmitter Main Page RF power output Audio line input level Inhibit PTT on (key) or off (de-key) Transmitter time out Modulation depth Antenna c/o delay (on or off) Key priority (local or remote) Enable or disable remote PTT Enable or disable remote phantom PTT. AM-MSK Mode Settings Screens The AM-MSK mode setting screen is accessed from the Settings screen. Use the Scroll/Select switch to select the parameter, then enter the required setting(s). P o w e r L i n e I n I n h i b i t E x i t Adjustments 5 0 W RF power between 5 W to 50 W.

- 1 3 d B m Audio line in level between -30 to +10 dBm. O F F

On or Off. P T T O F F On (key), Off (de-key). T X T i m e o u t 1 8 0 s 2 to 510 s. M o d D e p t h 8 5 %

5 to 95%. E x i t

A n t K e y C / O D e l O N On or Off. P r i o r i t y L - R Local-remote or Remote-local. L o c a l P T T E x i t E N

Enabled or Disabled. R e m o t e P T T R e m P h a n P T T E N E N Enabled or Disabled. Enabled or Disabled. B a c k E x i t

T6T VHF 50 W Transmitter Page 18 Operation Back to Transmitter Main Page Mode 2 Settings Screen This is an advisory screen. Pressing OK returns the user to the Main screen. M o d e 2 p a r a m e t e r s a r e s e t H L D C i n t v i e r a f t h e a c e O K Mode 3 Settings Screen This is an advisory screen. Pressing OK returns the user to the Main screen. M o d e 3 p a r a m e t e r s a r e s e t v i a t h e T 1 / E 1 i n t e r f a c e O K T6T VHF 50 W Transmitter Page 19 Operation Back to Transmitter Main Page Polarities Screens AM-Voice and AM-MSK A number of remote indication and control signals can be hard-wire connected to the transmitter. These signals include a transmitter ready indication, a PTT control signal, a phantom PTT control signal, a PTT out indication, a transmitter inhibit control signal, a BIT test initiation control signal, an external VSWR fault indication and antenna C/O. The following paragraphs detail the signals applicable to the operational mode of the transmitter. The Polarities screen is accessed from the Settings screen. AM-Voice and AM-MSK Polarity Settings ten polarity settings applicable Each of to AM-voice and AM-MSK can be set to the default STD (standard) setting or INV (inverted). The signal connections are shown in Table 6 on page 21 along with the conditions when STD or INV is selected. The settings for the PTT Reference voltage are also shown in Table 6. R e a d y O u t E - B I T I n I n h i b i t I n E x i t S T D S T D S T D

B I T P T T P T T E x i t S t a r t I n S T D R e f I n

+ 1 4 V S T D

P h a n P T T I n P T T O u t F a s t P T T O u t S T D S T D S T D E x i t

E x t A n t V S W R I n C / O O u t S T D S T D B a c k E x i t

T6T VHF 50 W Transmitter Page 20 Operation Back to Transmitter Main Page Table 6 AM-Voice and AM-MSK Polarity Settings Signal Connector Polarity set to STD Polarity set to INV Ready Out Facilities, pin 13 An open collector grounded output when the radio is ready to transmit and no BIT faults are detected. An open collector high impedance output when the radio is ready to transmit and no BIT faults are detected. E-BIT In Facilities, pin 2 TTL input. 0 V indicates an external fault. TTL input. 5 V indicates an external fault. Inhibit In Facilities, pin 10 TTL input. 0 V inhibits transmitter operation. TTL input. 5 V inhibits transmitter operation. BIT Start In Facilities, pin 11 TTL input. 0 V initiates an interruptive BIT test. TTL input. 5 V initiates an interruptive BIT test. PTT In MARC, pin 4 MARC Audio, pin 6 Phantom PTT In MARC or MARC Audio, pin 2 PTT Out Facilities, pin 3 Active when input differs from reference by more than 10 V. Inactive when input differs from reference by less than 1 V. Maximum input level 60 V with respect to reference. Input will draw no more than 6 mA, requires at least 1 mA to operate. Active when input differs from reference by less than 1 V. Inactive when input differs from reference by more than +10 V. Maximum input level +60 V with respect to reference. Input will draw no more than 6 mA, requires at least 1 mA to operate. Active when input differs from reference by more than 10 V. Inactive when input differs from reference by less than 1 V. Maximum input level 60 V with respect to reference. Input will draw no more than 6 mA, requires at least 1 mA to operate. Active when input differs from reference by less than 1 V. Inactive when input differs from reference by more than +10 V. Maximum input level +60 V with respect to reference. Input will draw no more than 6 mA, requires at least 1 mA to operate. Grounding solid state relay.

+60 to -60 V, ac or dc, 100 mA max, n/o. Activated 20 ms

(1 ms) before the start of the power ramp up to allow for the antenna relay to pull-in time. Grounding solid state relay.

+60 to -60 V, ac or dc, 100 mA max, n/c. Activated 20 ms

(1 ms) before the start of the power ramp up to allow for the antenna relay to pull-in time External VSWR Input Facilities, pin 4 TTL input. 0 V active. TTL input. 5 V active. Antenna Changeover Facilities, pin 5

(Common pin 6) Solid state relay. +60 to -60V, ac or dc, 100 mA max, n/o. Activated 35 ms (1 ms) before the start of the power ramp up to allow for the antenna relay pull-in time. Solid state relay. +60 to -60V, ac or dc, 100 mA max, n/c. Activated 35 ms (1 ms) before the start of the power ramp up to allow for the antenna relay pull-in time. Common 0 V. Common 0 V. Continued >>

T6T VHF 50 W Transmitter Page 21 Operation Back to Transmitter Main Page Table 6 AM-Voice and AM-MSK Polarity Settings (Continued) Signal Connector Polarity set to STD Polarity set to INV Fast PTT Output

(antenna changeover) MARC Audio, pin 3 Open collector NPN transistor grounding output, 200 mA max, n/o). Open collector NPN transistor grounding output, 200 mA max, n/c. PTT Ref

PTT Ref can be set to +14 V, 0 V or -14 V. PTT state is:

+14 V Ref. key +4 V

+24 V unkey +13 to

+15 V 0 V Ref. key -10 V

+10 V unkey -1 V to +1 V

-14 V Ref. key -24 V

-4 V unkey -13 to -15 V PTT Ref can be set to +14 V, 0 V or -14 V. PTT state is:

+14 V Ref. unkey +4 V

+24 V key +13 to +15 V 0 V Ref. unkey -10 V

+10 V key -1 V to +1 V

-14 V Ref. unkey -24 V

-4 V key -13 to -15 V Maximum input level 60 V with respect to reference. Input will draw no more than 6 mA, and requires at least 1 mA to operate. Maximum input level 60 V with respect to reference. Input will draw no more than 6 mA, and requires at least 1 mA to operate. T6T VHF 50 W Transmitter Page 22 Operation Back to Transmitter Main Page Mode 2 and Mode 3 Polarity Settings R e a d y O u t E - B I T I n E x E x t i t V S W R I n S T D S T D S T D

Each of the three polarity settings applicable to Mode 2 and Mode 3 can be set to the default STD

(standard) setting or INV (inverted). The signal connections are shown in Table 7 along with the conditions when STD or INV is selected. B a c k E x i t

Table 7 Mode 2 and Mode 3 Polarity Settings Signal Connector Polarity set to STD Polarity set to INV Ready Out Facilities, pin 13 An open collector grounded output when the radio is ready to transmit and no BIT faults are detected. An open collector high impedance output when the radio is ready to transmit and no BIT faults are detected. E-BIT In Facilities, pin 2 TTL input. 0 V indicates an external fault. TTL input. 5 V indicates an external fault. External VSWR Input Facilities, pin 4 TTL input. 0 V active. TTL input. 5 V active. T6T VHF 50 W Transmitter Page 23 Operation Back to Transmitter Main Page AM-Voice and AM-MSK BIT Screen The AM-voice and AM-MSK BIT screen is accessed from the Control screen. B I T E T I I n i t i a t e Select to initiate BIT test. 0 0 0 0 0 : 0 0 h r s Shows elapsed time 0:00 to 99999:59 (Hrs:Min). A C S u p p l y E x i t O N

Shows state of ac supply (On or Off). D C S u p p l y S u p p l y O N Shows state of dc supply (On or Off). 2 8 V dc supply 0 to 40 V, <21.6 V Alert, <19 V Alarm. S y n t h L o c k P A S S Pass or Fail (Out-of-Lock). E x i t

P A P A T e m p 5 0 d e g C PA temperature -20C to +150C. C o o l i n g P A S S Pass or Fail. B a s e b a n d E x i t P A S S

Pass, Fail or Not Tested. R F P A P A D r i v e O u t p u t L o o p P A S S P A S S Pass, Fail or Not Tested. Pass, Fail or Not Tested. P A S S Pass, Fail or Not Tested. E x i t

M o d D e p t h R F F i l t e r s V S W R E x i t L o o p E r A u d i o I o r r n D S P 1 E x i t P A S S P A S S P A S S

P A S S P A S S P A S S

Pass, Fail or Not Tested. Pass, Fail or Not Tested. Pass, Fail or Not Tested. Pass or Fail. Pass, Fail or Not Tested. Pass or Fail. T6T VHF 50 W Transmitter Page 24 Operation Back to Transmitter Main Page D S P 2 X i X i E x l l i i i t n x 1 n x 2 P A S S Pass or Fail. P A S S Pass or Fail. P A S S Pass or Fail.

E E P R O M S t a r t U p P A S S Pass or Fail. P A S S Pass or Fail. C a l E x i i t b r a t i o n P A S S Pass or Fail.

U n k e y e d P w r P A S S Pass or Fail. E - B I T M A R C E x i t H D L C T 1 / E 1 B a c k E x i t P A S S Pass or Fail. A C T I V E

Active or Inactive. I N A C T I V E Active or Inactive. I N A C T I V E Active or Inactive.

T6T VHF 50 W Transmitter Page 25 Operation Mode 2 and Mode 3 BIT Screen The Mode 2 and Mode 3 BIT screen is accessed from the Control screen. Back to Transmitter Main Page 0 0 0 0 0 : 0 0 h r s Shows elapsed time 0:00 to 99999:59 (Hrs:Min). E T I A C D C E x i t S u p p l S u p p l y y O N O N

Shows state of ac supply (On or Off). Shows state of dc supply (On or Off). S u p p l y 2 8 V Shows value of dc supply. S y n t h L o c k P A S S Synth lock (Pass or Fail). P A T e m p 5 0 d e g C Indicates the PA temperature. E x i t

P A C o o l i n g V S W R L o o p E r r o r E x i t P A S S P A S S P A S S

Pass or Fail. Pass, Fail or Not Tested. Pass or Fail. P A S S Pass or Fail. P A S S Pass or Fail. P A S S Pass or Fail.

P A S S Pass or Fail. P A S S Pass or Fail. P A S S Pass or Fail.

D S P 1 D S P 2 X i l E x i X i l i t i n x 1 n x 2 E E P R O M S t a r t U p E x i C a l t i b r a t i o n P A S S Pass or Fail. E - B I T M A R C E x i t H D L C T 1 / E 1 B a c k E x i t P A S S Pass or Fail. A C T I V E

Active or Inactive. I N A C T I V E Active or Inactive. I N A C T I V E Active or Inactive.

T6T VHF 50 W Transmitter Page 26 Operation Back to Transmitter Main Page Software Configuration Screens Software configuration screens are as follows:

T 6 V H F 5 0 W T X 1 1 8 - 1 3 6 . 9 7 5 M H z H i g h S t a b i l i t y E x i t

Second line variation for WB radios reads 112-155.975 MHz. Third line variation for WB radios is blank. B o o t S o f t w a r e 6 5 -

x x x x x x x x /

v v E x i t

B a s e S o f t w a r e 6 5 -

x x x x x x x x /

v v E x i t

M o d e S o f t w a r e 6 5 -

x x x x x x x x /

v v E x i F i l t l

1 S o f t w a r e 6 5 -

x x x x x x x x /

v v

[ D e s c r i p t i o n ]

E x i F i l t l

2 S o f t w a r e 6 5 -

x x x x x x x x /

v v

[ D e s c r i p t i o n ]

E x i t

65-xxxxxxxx number and /v v represents its version. represents the software part 65-xxxxxxxx number and /v v represents its version. represents the software part Current mode 65-xxxxxxxx represents the software part number and /v v represents its version. running. 65-xxxxxxxx number and /v v represents its version. represents the software part 65-xxxxxxxx number and /v v represents its version. represents the software part T6T VHF 50 W Transmitter Page 27 Operation Back to Transmitter Main Page F i l l 3 S o f t w a r e 6 5 -

x x x x x x x x /

v v

[ D e s c r i p t i o n ]

65-xxxxxxxx represents the software part number and /v v represents its version. F i l l 4 S o f t w a r e 6 5 -

x x x x x x x x /

v v

[ D e s c r i p t i o n ]

65-xxxxxxxx represents the software part number and /v v represents its version. Band Edges The frequency range of the transmitter is 118 to 136.975 MHz for the B6350/NB version, or 112 to 155.975 MHz for the B6350/WB version. If required, transmission can be limited to either one or two smaller parts of the frequency band by setting the band edges BE1 to BE4. Transmission is possible between BE1 and BE2 frequencies, and frequencies between BE3 and BE4. B E 1 B E 2 B E 3 E x i t 1 1 8 . 0 0 0 M H z 1 3 6 . 9 7 5 M H z 1 1 8 . 0 0 0 M H z

B E 4 1 3 6 . 9 7 5 M H z The Band Edge screen is accessed from the Control screen. Band edge frequencies can be set only in increments of 25 kHz. If the transmitter is required to operate over the full range, the band edge parameters must be set to the lowest and highest values in the range (see Table 8). E x i t

Table 8 Band Edge Values B6350/NB set so that operation is over the full frequency range. B6350/WB set so that operation is over the full frequency range. Example: Transmitter set to transmit only those frequencies in the range 120 to 130 MHz. Example: Transmitter set to transmit only those frequencies in the ranges 120 to 125 MHz and 130 to 135 MHz. BE1 BE2 BE3 BE4 118.000 136.975 118.000 136.975 112.000 155.975 112.000 155.975 120.000 130.000 120.000 130.000 120.000 125.000 130.000 135.000 T6T VHF 50 W Transmitter Page 28 Operation Back to Transmitter Main Page BIT Status Warning Screens The following shows some example BIT screens. These screens alternate with the Main screen when an alert or alarm condition is present. Only the parameters causing the alert or alarm are displayed, and if both an alert and alarm condition exists simultaneously only the alarm information is displayed. If multiple parameters are signalling an alert or alarm condition, multiple screens are used to display the status alternating with the Main screen. A L E R T No RF power reduction S u p p l y 2 1 V Alarm indicator flashing A L E R T RF power reduced between 1 and 3 dB R F P o w e r R e d u c e d L o o p E r r o r S u p p l y 2 1 V Alarm indicator flashing A L E R T RF power reduced between 1 and 3 dB R F P A P o w e r R e d u c e d T e m p 8 5 d e g C Alarm indicator flashing A L A R M RF power reduced by more than 3 dB R F P o w e r R e d u c e d V S W R F A I L Alarm indicator on A L A R M RF power shut down R F P o w e r R e m o v e d L o o p E r r o r F A I L S u p p l y 1 8 V Alarm indicator on A L A R M RF power shut down R F P A P o w e r R e m o v e d T e m p 9 5 d e g C Alarm indicator on T6T VHF 50 W Transmitter Page 29 Operation Back to Transmitter Main Page Table 9 Functions and Parameters Function Front Panel VFP MARC T6 Controller T1/E1 HDLC Default Setting FREQUENCY Change frequency 118.000 MHz FREQUENCY CHANNELS Store/Recall preset frequency channels SETTINGS Set modulation mode

AM-Voice Radio Settings (AM Modes):

Set RF output power Set audio input line level Set inhibit on or off PTT test facility on (key), off (de-

key) Set Tx time out Set modulation depth Set mute on or off

(AM-Voice only) Set VOGAD on or off

(AM-Voice only) Set antenna C/O delay on or off Set frequency offset

(AM-Voice only) Set frequency step size

(AM-Voice only) View state 50 W

-13 dBm Off Off 180 s 85%

On On AM-Voice - On AM-MSK - Off 0 (No offset) 25 kHz Continued >>

T6T VHF 50 W Transmitter Page 30 Operation Back to Transmitter Main Page Table 9 Functions and Parameters (Continued) Function Front Panel VFP MARC T6 Controller T1/E1 HDLC Default Setting Radio Settings (Digital Modes):

Set microphone type

(active or passive)

(AM-Voice only) Set keying priority

(local or remote) Enable or disable local PTT Enable or disable remote PTT Enable or disable remote phantom PTT MAC TM1 (inter access delay) MAC TM2 (channel busy) MAC p

(persistance) MAC M1 (maximum number of access attempts) Scramble vector Tx enable Polarities:

Ready out Set PTT input polarity

(AM modes only) Set phantom PTT input polarity

(AM modes only) View state View state View state Passive Local-Remote Enabled Enabled Enabled 2.5 ms 60 s 13/256 135 4D4B 19787 On STD STD STD Continued >>

T6T VHF 50 W Transmitter Page 31 Operation Back to Transmitter Main Page Table 9 Functions and Parameters (Continued) Function Front Panel VFP MARC T6 Controller T1/E1 HDLC Default Setting Set PTT reference voltage

(AM modes only) Set PTT output polarity

(AM modes only) Set fast PTT antenna changeover output polarity

(AM modes only) Set antenna changeover output polarity

(AM modes only) Set external VSWR input polarity

(All modes) Set inhibit input polarity

(AM modes only) BIT interruptive test input polarity

(AM modes only) E-bit input polarity

(All modes) Band Edges:

View state View state View state View state View state View state View state View state

+14 V STD STD STD STD STD STD (active low) STD (active low) Set band edges or 112.000 and 155.975 MHz 118.000 and 136.975 MHz Reference Frequency:

Adjust transmitters reference frequency LCD Backlight:

Adjust LCD backlight

30 s Continued >>

T6T VHF 50 W Transmitter Page 32 Operation Back to Transmitter Main Page Table 9 Functions and Parameters (Continued) Function Front Panel VFP MARC T6 Controller T1/E1 HDLC Default Setting BIT Initiate BIT interruptive test STANDBY Enter and exit standby facility

Not in Standby SOFTWARE CONFIGURATION View the transmitters software configuration LOCK FACILITIES Front panel lock MARC lock T1/E1 lock HDLC lock End of Document

Off Off Off Off T6T VHF 50 W Transmitter Page 33 Operation Back to Transmitter Main Page Installation Back to Transmitter Main Page Warnings and Cautions WARNING Dangerous Voltages The instructions given in this section involve connecting dangerous voltages to the transmitter. The instructions detailed in this document must be carried out only by suitably qualified personnel. WARNING Dangerous Voltages The equipment is permanently connected to the mains supply when the mains connector is attached. Switching the rear panel Power switch to off does not isolate all internal circuits from the mains supply. For this reason, a mains isolating switch should be fitted close to, and easily accessible from, the transmitter's position. The isolation switch should isolate both live and neutral supplies, be clearly labelled, and adequately rated to protect the equipment. WARNING Antenna Radiation The antenna used with the transmitter must be installed such that the resultant radiated field strength is below 10 W/m in areas normally accessible to personnel. Caution ESSDs The T6T transmitter's circuitry contains Electrostatic Sensitive Devices (ESSDs). Personnel must be aware of the precautions necessary to prevent damage to such devices. During installation all precautions necessary to prevent ESSD damage must be taken. Caution Unauthorized Modifications Changes or modifications made to this equipment that are not expressly approved by Park Air, or parties authorized by Park Air, could void the users authority to operate the equipment. T6T VHF 50 W Transmitter Page 2 Installation Back to Transmitter Main Page Introduction The procedures necessary to install a transmitter are listed in Table 1. Table 1 Installation Procedures Procedure Reference Read and understand the warnings and cautions given on page 2. Perform an initial inspection of the transmitter and fit the correct ac input fuse. page 9 Fit the transmitter into an equipment cabinet. Make external signal connections. See Fig 1 to Fig 5 to determine which external connections are required for the particular configuration. Connect the chassis stud to the cabinet or system earth. Connect the antenna. Connect the dc input supply (if required). Connect the ac input supply (if required). page 9 page 10 page 22 page 22 page 22 page 23 1 2 3 4 5 6 7 8 Fuses and Connectors The following list details the radios supply fuses and connectors. Some of the connectors (depending on your particular configuration) are required during installation. Table 2 Fuses and Connectors Component Type Park Air Part Number Fuses:

AC input fuse, F2, for 110/120 V input AC input fuse, F2, for 220/230 V input T4A, 125V, UL T4A, 250V, IEC DC input fuse Connectors:

AC supply connector DC supply connector Antenna connector MARC connector MARC audio MARC data 15A size 0 IEC XLR3 socket N-type plug 9-way D-type plug RJ48 plug RJ48 plug Facilities connector 15-way D-type plug HDLC connector T1/E1 connector RJ48 plug RJ48 plug Reference connector SMB connector Microphone/Diagnostics connector 7-pin DIN plug 29C11120102S 29E01120108S 29-01350201 20-02030102 20-01030106 19-01030301 Plug: 20-01090100 Cover: 20-09090101 20K01080100 20K01080100 Plug: 20-01150100 Cover: 20-09150101 20K01080100 20K01080100 19C01050300 20-01070101 T6T VHF 50 W Transmitter Page 3 Installation Back to Transmitter Main Page Configuration Connection of external equipment depends on the configuration required. Possible configurations are:

T6T transmitter configured for local operation (see Fig 1). T6T transmitter configured for remote operation (see Fig 2). T6T transmitter configured for use with MARC (see Fig 3). T6T Mode 2 configuration (see Fig 4). T6T Mode 3 configuration. (see Fig 5). Optional Facilities that can be used if required E-BIT input PTT relay output External VSWR input Unregulated supply output Inhibit input BIT interruptive test input Antenna changeover output Ready output Tape output T6T Transmitter Facilities Connector Antenna Connector Reference Connector Microphone/Diagnostics Connector Frequency Counter required only for maintenance Mic/Headset for local operation Laptop (or PC) required only for maintenance For local operation, the transmitter is operated from the front panel using a microphone/headset. Any of the optional facilities may be connected. Fig 1 T6T Transmitter Configured for Local Operation T6T VHF 50 W Transmitter Page 4 Installation Back to Transmitter Main Page Audio PTT Unregulated supply RS422 Data T6T Transmitter MARC Connector or, MARC Data and MARC Audio Connectors Optional Facilities that can be used if required E-BIT input PTT relay output External VSWR input Unregulated supply output Inhibit input BIT interruptive test input Antenna changeover output Ready output Tape output Antenna Connector Facilities Connector Reference Connector Microphone/Diagnostics Connector Frequency Counter required only for maintenance Mic/Headset for engineering use Laptop (or PC) required only for maintenance For remote operation, Audio and PTT signals from the control equipment terminate on the MARC connector, or alternatively on the MARC Audio connector. If data is required by a compatible data system, the RS422 data lines terminate on the MARC connector, or alternatively on the MARC Data connector. Any of the optional facilities may be connected. Fig 2 T6T Transmitter Configured for Remote Operation T6T VHF 50 W Transmitter Page 5 Installation RSE2 Equipment Connector Audio PTT Unregulated supply RS422 data MARC Connector Back to Transmitter Main Page T6T Transmitter Antenna Connector Optional Facilities that can be used if required E-BIT input PTT relay output External VSWR input Unregulated supply output Inhibit input BIT interruptive test input Antenna changeover output Ready output Tape output Facilities Connector Reference Connector Microphone/Diagnostics Connector Frequency Counter required only for maintenance Mic/Headset for engineering use When using a T6T transmitter with a MARC Remote Site Equipment (RSE2) the transmitter MARC connector is pin-to-pin wired to one of the RSE2 Equipment connectors. Any of the optional facilities may be connected. Laptop (or PC) required only for maintenance Fig 3 T6T Transmitter Configured for use with MARC T6T VHF 50 W Transmitter Page 6 Installation Back to Transmitter Main Page T6T Transmitter Reference Connector Microphone/Diagnostics Connector Antenna Connector HDLC Connector T1/E1 Connector Facilities Connector Mode 2 Network Computer Control and data Control and data. 2 km maximum distance Antenna c/o control Fast Antenna Change-Over Switch T6R Receiver T1/E1 Connector Reference Connector Headset/Diagnostics Connector Antenna Connector Connects to the Reference connector Connects to the Microphone/Diagnostics connector Frequency Counter required only for maintenance Laptop (or PC) required only for maintenance Fig 4 T6T Transmitter Mode 2 Configuration T6T VHF 50 W Transmitter Page 7 Installation Back to Transmitter Main Page T6T Transmitter Antenna Connector T1/E1 Connector Reference Connector Microphone/Diagnostics Connector Mode 3 Network Computer Control and data Frequency Counter required only for maintenance Laptop (or PC) required only for maintenance Fig 5 T6T Transmitter Mode 3 Configuration T6T VHF 50 W Transmitter Page 8 Installation Back to Transmitter Main Page Installation Procedures Initial Inspection of the Transmitter On receipt of the transmitter, remove all transit packaging and check that there is no damage. If damage is evident, contact Park Air immediately and retain the original transit packaging. One copy of the T6 User Guide CD (part number 31-36T62VCD) is normally supplied with the transmitter. This CD includes the VFP software. Fitting the Correct AC Input Fuse The mains input fuse F2 is an integral part of the rear panel ac connector. The fuse type must be correct for the local mains supply as detailed below. Earth Line Neutral For a mains input in the range 110 to 120 Vac, fuse F2 should be rated T4A, 125V, UL. For a mains input in the range 110 to 240 Vac, fuse F2 should be rated T4A, 250V, IEC. FS2 Spare Fuse Holder for spare fuse (not supplied) Fitting a Radio into an Equipment Cabinet Caution Mechanical Support It is essential that the chosen mechanical installation provides adequate support along the depth (front to rear) of the unit. The transmitter must not be supported by the front panel;

doing so can cause damage. The transmitter can be installed on telescopic slides, or on fixed runners, within a standard 483 mm

(19 inch) equipment cabinet. M4 tapped holes, each 10 mm deep (see Fig 6) are provided on each side of the equipment to accept the slides. Details of suitable telescopic slides and fixed runners are available from Park Air. When fitted in the cabinet, the transmitter's front panel must be secured to the cabinets chassis using four M6 x 16 mm screws and plastic washers. T6T VHF 50 W Transmitter Page 9 Installation Back to Transmitter Main Page 88.9 Front Panel 29.0 41.7 47.0 152.8 207.5 232.2 378.2 390.9 399 430 450 All measurements in mm Fig 6 Slide Fittings Make External Signal Connections Making the external signal connections involves configuring the transmitter to suit its operational mode. Illustrations showing various configurations are shown in Fig 1 to Fig 5; these figures should be used only as a guide. Front Panel Connectors The front panel has two connectors; Microphone/Diagnostics and Reference connectors. These are illustrated in Fig 7. Fig 7 Front Panel T6T VHF 50 W Transmitter Page 10 Installation Back to Transmitter Main Page Microphone/Diagnostics Connector The Microphone/Diagnostics connector is a self-locking 7-way DIN socket used for connecting a microphone, microphone/headset or PC. The connector pin-out is detailed in Table 3. Pin-out of the Microphone/Diagnostics connector looking into the mating face of the chassis mounted socket. A suitable free socket is detailed in Table 2 on page 3. Table 3 Microphone/Diagnostics Connector Pin Number Signal Characteristic Usage 1 2 3 4 5 6 7 Microphone ground 0 V Microphone/Headset Transmit data RS232. 115200 baud, 8 data bits, 1 stop bit, no parity, no handshaking. PC Microphone PTT 0 V to PTT. Microphone/Headset Receive data RS232. 115200 baud, 8 data bits, 1 stop bit, no parity, no handshaking. PC Sidetone Microphone input To ensure correct VOGAD operation, the fol-

lowing microphone input levels are required:

Passive setting: between 2 and 35 mV Active setting: between 8 and 140 mV. Microphone/Headset Microphone/Headset Ground 0 V PC Reference Connector The Reference connector is an SMB plug used to monitor the radios reference frequency. It monitors the frequency at a level of 100 mV (50 mV) with less than -10 dBc harmonics. T6T VHF 50 W Transmitter Page 11 Installation Back to Transmitter Main Page Rear Panel Connectors The rear panel connectors are shown in Fig 8 and listed in Table 4. Select which connectors are going to be used and then make connections as required. Table 4 Rear Panel Connector Usage Connector Type Usage AC Supply DC Supply Antenna IEC XLR 3-pin N-type Terminating the ac input supply. Terminating the dc input supply. Terminating the antenna feeder coaxial cable. External Speaker 3.5 mm stereo jack Connects an external loudspeaker for monitoring sidetone. MARC 9-way D-type MARC Audio MARC Data RJ48 RJ48 Facilities 15-way D-type T1/E1 RJ48 Used to connect to a MARC remote site equipment. Used to connect a T6 controller or hub. Used to terminate remote audio and PTT signals when a remote site equipment or T6 controller is not used. Used as an alternative to the MARC connector for terminating remote audio and PTT signals. Used as an alternative to the MARC connector for terminating data signals to and from a compatible data system. Provides a number of optional facilities that can be used as required. Used for connecting the radio to a Mode 3 network computer, connecting a transmitter and receiver together as a Mode 2 base station, or for connecting to a digital voice and data net-

work. HLDC RJ48 Used to connect to a Mode 2 network computer. ANTENNA DANGER HIGH RF VOLTAGES CONNECT ANTENNA BEFORE USE T1/E1 HDLC MARC DATA MARC AUDIO MARC FACILITIES AC SUPPLY RATINGS AC SUPPLY 48 - 62Hz

~ 110 - 240V ( +10%) 4A POWER 400VA max FUSE F2 110-240V T4A 250V IEC 110V - 120V T4A 125V UL DC SUPPLY 21.6 - 32V 10A FUSE F1 F15A 32V SEE INSTALLATION INSTRUCTIONS BEFORE CONNECTING SUPPLIES SUPPLY FUSE F1 FUSE F2 DISCONNECT SUPPLIES WHEN NOT IN USE DC SUPPLY Fig 8 Rear Panel (Connectors) T6T VHF 50 W Transmitter Page 12 Installation Back to Transmitter Main Page MARC Connector The MARC connector is a 9-way D-type socket used to connect the transmitter to a MARC remote site equipment, or it can also be used for normal remote operation. As an alternative to using this connector, the RJ48 style MARC Audio and MARC Data connectors can be used to provide the same functions. The MARC connector pin-out is shown below and detailed in Table 5. 5 1 9 6 Pin-out of MARC connector looking into the mating face of the chassis mounted socket. A suitable free socket is detailed in Table 2 on page 3. Table 5 MARC Connector Pin Number Signal Characteristic 1 2 3 4 5 6 7 8 9 Ground 0 V Audio line in (+) Balanced 600 ohm, -20 to +20 dBm. Audio line in (-) PTT input Output supply Data in (+) Data In (-) Data Out (+) Data Out (-) Phantom keying can be superimposed on the audio lines. See Fig 10. Remote PTT signal input. See Fig 9. This output is between 21.6 and 32 Vdc (nominally 28 V) fused at 500 mA. RS422 differential asynchronous data at 9600 baud, 8 data bits, 1 stop bit, no parity, no handshaking. RS422 differential asynchronous data at 9600 baud, 8 data bits, 1 stop bit, no parity, no handshaking. Note ... The line level figures shown for the MARC connector are the limits when testing the transmitter using a sine wave; the line level will be 10 dB above the line level setting. See the information supplied under the heading Line Level Settings in Operation. T6T VHF 50 W Transmitter Page 13 Installation Back to Transmitter Main Page MARC Audio Connector The MARC Audio connector is an 8-way RJ48 socket. It can be used as an alternative to the MARC connector for audio and PTT connections. The connector pin-out is shown below and detailed in Table 6. Numbering is shown looking from the top of the connector. The top is being viewed when the lever is on the bottom. RJ48 Plug Pin 1 Table 6 MARC Audio Connector Pin Number Signal Characteristic 1 2 3 4 5 6 7 8 Audio line in -

(input) Audio line in +

(input) Fast antenna changeover/PTT

(output) Not used Not used Balanced 600 ohm, -20 to +20 dBm. Phantom keying can be superimposed on the audio lines. See Fig 10. Open collector NPN transistor grounding output, 200 mA max, configurable n/o or n/c).

PTT (input) Remote PTT signal input. See Fig 9. Ground Not used 0 V.

Note ... The line level figures shown for the MARC Audio connector are the limits when testing the transmitter using a sine wave; the line level will be 10 dB above the line level setting. See the information supplied under the heading Line Level Settings in Operation. T6T VHF 50 W Transmitter Page 14 Installation Back to Transmitter Main Page T6T Transmitter MARC Audio Connector audio is pins 1 and 2 PTT is pin 6 ground is pin 7. MARC Connector audio is pins 2 and 3 PTT is pin 4 ground is pin 1. Reference Voltage

(0 V, +14 V or -14 V) Set from front panel PTT input requires at least 1 mA to operate. Input will draw no more than 6 mA. MARC or MARC Audio Connector Audio line 1 Audio line 2 PTT Control Equipment Audio Circuit Cross-Site Lines PTT Switch VPTT The transmitter reference voltage (0 V, +14 V or -14 V) is selected from the Polarities screen. PTT is active when VPTT differs from the transmitter reference voltage by more than 10 V. PTT is inactive when VPTT differs from the transmitter reference voltage by less than 1 V. Maximum value of VPTT is 60 V with respect to transmitter reference voltage. Example:

To use 0 V as the keying potential, VPTT = 0 V; set transmitter reference voltage to +14 V; set PTT In to STD. Fig 9 Remote Keying MARC or MARC Audio Connector Audio lines with phantom keying signal superimposed T6T Transmitter MARC Audio Connector:

Audio is pins 1 and 2 MARC Connector:

Audio is pins 2 and 3 Reference Voltage

(0 V, +14 V or -14 V) Set from front panel PTT input requires at least 1 mA to operate. Input will draw no more than 6 mA. Control Equipment Audio Circuit PTT Switch VPTT To reduce the number of cross-site lines between the control site and the transmitter, phantom keying may be employed. This method has the keying potential (VPTT) superimposed on the audio lines instead of using a separate line. The transmitter reference voltage (0 V, +14 V or -14 V) is selected from the Polarities screen. PTT is active when VPTT differs from the transmitter reference voltage by more than 10 V. PTT is inactive when VPTT differs from the transmitter reference voltage by less than 1 V. Maximum value of VPTT is 60 V with respect to transmitter reference voltage. Example:

To use 0 V as the keying potential, VPTT = 0 V; set transmitter reference voltage to +14 V; set PTT In to STD. Fig 10 Phantom Keying T6T VHF 50 W Transmitter Page 15 Installation Back to Transmitter Main Page MARC Data Connector The MARC Data connector is an 8-way RJ48 socket. It can be used as an alternative to the MARC connector for data connections. The connector pin-out is shown below and detailed in Table 7. Numbering is shown looking from the top of the connector. The top is being viewed when the lever is on the bottom. RJ48 Plug Pin 1 Table 7 MARC RJ48 Data Connector Pin Number Signal Characteristic 1 2 3 4 5 6 7 8 Data in (-) Data in (+) RS422 differential asynchronous data, 9600 baud, 8 data bits, 1 stop bit, no parity, no handshaking. Not connected

Data out (+) Data out (-) RS422 differential asynchronous data, 9600 baud, 8 data bits, 1 stop bit, no parity, no handshaking. Remote Supply ON/OFF 0 V to switch off. Ground Output supply Note: Rear panel switch must be in ON position for this function to operate. 0 V. This output is between 21.6 and 32 Vdc (nominally 28 V) fused at 500 mA. T6T VHF 50 W Transmitter Page 16 Installation Back to Transmitter Main Page T1/E1 Connector The T1/E1 connector is an 8-way RJ48 socket used for connecting to a Mode 3 network computer or connecting a transmitter and receiver together when operating as a Mode 2 base station. The connector pin-out is detailed in Table 8. Numbering is shown looking from the top of the connector. The top is being viewed when the lever is on the bottom. RJ48 Plug Pin 1 Pin Signal Characteristic Table 8 T1/E1 Connector 1 2 3 4 5 6 7 8 RRing T1 - Balanced 100 ohm (10%), 1.544 Mbits per second (50 ppm), AMI/B8ZS Coding. E1 - Balanced 120 ohm (10%), 2.048 Mbits per second (50 ppm), AMI/HDB3 Coding. Protected with 28 V differential and common mode clamp and 1.25 A fuse in each line. RTip Not connected

TRing TTip T1 - Balanced 100 ohm (10%), 1.544 Mbits per second (50 ppm), AMI/B8ZS Coding. E1 - Balanced 120 ohm (10%), 2.048 Mbits per second (50 ppm), AMI/HDB3 Coding. Protected with 28 V differential and common mode clamp and 1.25 A fuse in each line. Not connected Not connected Not connected

T6T VHF 50 W Transmitter Page 17 Installation Back to Transmitter Main Page HDLC Connector The HDLC connector is an 8-way RJ48 socket used for connecting to a Mode 2 network computer. The connector pin-out is detailed in Table 9. Numbering is shown looking from the top of the connector. The top is being viewed when the lever is on the bottom. RJ48 Plug Pin 1

. Pin Signal Characteristic Table 9 HDLC Connector 1 2 3 4 5 6 7 8 HDLC RX A

(input) HDLC RX B

(input) HDLC CL A

(output) HDLC TX B

(output) HDLC TX A

(output) HDLC CL B

(output) Ground RS422 differential synchronous data, 128 kbytes per second

(50 ppm). RS422 differential synchronous data, 128 kbytes per second

(50 ppm). RS422 differential synchronous data, 128 kbytes per second

(50 ppm). Pair to pin 3. 0 V. Output supply This output is between 21.6 and 32 Vdc (nominally 28 V) fused at 500 mA. T6T VHF 50 W Transmitter Page 18 Installation Back to Transmitter Main Page External Speaker The External Speaker connector is a 3.5 mm stereo jack used for connecting an external speaker to the transmitter to provide sidetone. This speaker should be a high impedance active type. Table 10 External Speaker Pin Signal Characteristic Tip Ring Speaker Drive (output) 0 to 3 V pk-pk. Connected directly to Ring. Speaker Drive (output) 0 to 3 V pk-pk. Connected directly to Tip. Sleeve Ground 0 V. T6T VHF 50 W Transmitter Page 19 Installation Back to Transmitter Main Page Facilities Connector The Facilities connector is a 15-way D-type filtered socket used for connecting to associated parts of a system. The connector pin-out is detailed in Table 11. 8 15 1 9 Pin-out of Facilities connector looking into the mating face of the chassis mounted socket. A suitable free socket is detailed in Table 2 on page 3. Pin Number Signal Characteristic Table 11 Facilities Connector 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Ground 0 V. E-BIT (input) An external BIT input that connects from any ancillary equipment having a compatible BIT alarm output. When this input is active, the transmitters front panel Alarm indicator flashes and an E-BIT message is displayed on the display. The input is TTL having a 4.7 kohm pull-up resistor to 5 V. The input is configurable from the front panel to be active high or low. PTT output Grounding solid state relay. +60 to -60 V, ac or dc, 100 mA max, configurable n/o or n/c. Activated 35 ms (1 ms) before the start of the power ramp up to allow for the antenna relay pull-in time. External VSWR input Used to indicate an external VSWR fault. TTL input with 4.7 kohm pull-

up to 5 V. Configurable active high or low. Antenna changeover

(output) Antenna changeover common (output) Not used Ground Output supply Inhibit (Input) Solid state relay linked to pin 6. See Fig 11 for further detail. Solid state relay linked to pin 5.

0 V. This output is between 21.6 and 32 Vdc (nominally 28 V) fused at 500 mA. Active signal prevents the transmitter keying. TTL with 4.7 kohm pull-

up to 5 V. Configurable active high or low. BIT interruptive test

(input) Active signal initiates a BIT test. TTL with 4.7 kohm pull-up to 5 V. Configurable active high or low. Must be asserted for >300 ms. Not used

Ready (output) An output that is active when the radio is ready to transmit and no faults are detected. Open collector NPN transistor grounding output, 200 mA max, configurable n/o or n/c. Tape (output) An audio output for connection to a recording system. 0 dBm fixed output into 600 ohm for 90% modulation depth. Reserved (output) Do not connect to pin 15 unless advised to do so by Park Air. T6T VHF 50 W Transmitter Page 20 Installation Back to Transmitter Main Page Antenna T6T Transmitter

(Main) Facilities Connector Antenna T6T Transmitter

(Standby) Facilities Connector Solid State Relay Antenna 28 Vdc (nominal) Main/Standby Transmit Relay 9 5 6 8 Control Link Example This example shows the Antenna Changeover Output configured to control the antenna switching between main and standby transmitters. The potential on Facilities connector pin 6 is switched through to pin 5 when the standby transmitter is keyed; in this example, pin 6 is linked to ground. This energizes the Main/Standby Transmit Relay to route the standby transmitter to the antenna. Other Configurations The antenna changeover output can be configured in other ways to suit the users requirement subject to:

Pin 6 can be any potential between -60 and +60 Vac, or dc. The maximum current drawn must not exceed 100 mA. The output at pin 5 is configurable normally open or normally closed from the Polarities screen. The internal solid state switch activates 35 ms before the start of the power ramp to allow for the antenna relay pull-in time. Fig 11 Example: Using the Antenna Changeover Output T6T VHF 50 W Transmitter Page 21 Installation Back to Transmitter Main Page Chassis Stud Connection WARNING Chassis Earth A chassis stud is fitted to the transmitter's rear panel. This stud is used to connect the equipment to the equipment cabinet, or to the user's system earth point. The stud must not be used as the safety earth. In order not to compromise the transmitters Electromagnetic Compatibility (EMC) the chassis stud, marked and fitted to the rear panel (see Fig 8) must be connected to the equipment cabinet (if a cabinet is being used) or to the user's system earth point. The connection should be made using a single tri-rated, green-and-yellow cable having a cross-sectional area of 2.5 mm2. The cable should have CSA and UL1015 approval, and be connected to the chassis stud through an M6 eyelet (for example, Park Air part number 20-08010103). Failure to comply with this instruction could result in non-compliance with the European Commission EMC Directive 89/336/EEC. Connect the Antenna The antenna connector is an N-type socket suitable for connecting a 50 ohm antenna. Connect the DC Input Supply The transmitter operates from either an ac, or a dc input supply. When both ac and dc are connected, operation from the ac supply takes priority; automatic change-over to the dc supply occurs if the ac supply fails. On restoration of the ac supply, the equipment reverts to ac operation. A dc input supply connector (see Fig 12) is fitted to the equipment's rear panel. The recommended minimum rating of the dc supply cable is: 2-core having a cross-sectional area of 1.5 mm2 per core. The supply cable should be fitted with an XLR 3-pin socket (Park Air part number 20-01030106). Positive Negative Pin-out of DC connector looking into the mating face of the chassis mounted socket. Not used Fig 12 DC Connector T6T VHF 50 W Transmitter Page 22 Installation Back to Transmitter Main Page Connect the AC Input Supply WARNING Dangerous Voltages The equipment is permanently connected to the mains supply when the mains connector is attached. Switching the rear panel Power switch to off does not isolate all internal circuits from the mains supply. For this reason, a mains isolating switch should be fitted close to, and easily accessible from, the transmitter's position. The isolation switch should isolate both live and neutral supplies, be clearly labelled, and adequately rated to protect the equipment. WARNING Earth Connection This equipment must be earthed. The earth terminal of the ac connector should be used as the safety earth. An ac input connector is fitted to the equipments rear panel. The cable used to connect between the equipment and the users ac power source should be 3-core (to IEC 227) rated 250 Vac at 8 amps, and have a minimum cross-sectional area of 1.0 mm2 per core. Park Air recommends the use of polyvinyl chloride (PVC) insulated cable. The cable must be fitted with the IEC approved equipment connector and conform to the following specification:

If PVC insulated, be not lighter than ordinary polyvinyl chloride sheathed flexible cord according to IEC publication 227 (designation H05 VV-F, or H05 VVH2-F). If rubber insulated, be of synthetic rubber and not lighter than ordinary tough rubber-sheathed flexible cord according to IEC publication 245 titled Rubber Insulated Cables of Rated Voltages up to and Including 450/750 V (designation H05 RR-F). The T6T transmitter is a Class 1 equipment. The ac supply cable should have a green-and-yellow protective earthing conductor electrically connected to the protective earthing terminal of the equipment connector and the mains plug. Park Air recommends the ac supply cable is colour coded in accordance with the electrical appliance (colour code) regulations for the UK. That is:

The core coloured green-and-yellow must be connected to the terminal in the plug that is marked with the letter E or by the earth symbol or coloured green-and-yellow. The core coloured blue must be connected to the terminal that is marked with the letter N or coloured black. The core coloured brown must be connected to the terminal that is marked with the letter L or coloured red. Earth Line Neutral FS2 Spare Fuse Holder for spare fuse (not supplied) T6T VHF 50 W Transmitter Page 23 Installation Back to Transmitter Main Page Switching On WARNING Dangerous Voltages When the POWER SWITCH is set to the Standby position, dangerous voltages are still present in the transmitter's internal power supply circuitry. To ensure safe working, the transmitter must be isolated from the ac and dc input supplies When installation is complete, the transmitter should be switched on at the rear panel 2-way rocker Power switch. The Power switch is used to switch on, and switch off, power to the transmitter's circuitry but does not remove power from the radio.

= On

= Standby Under normal circumstances this screen is displayed for a few seconds when the radio is switched on. T 6 D i g i

I

. c ) n i

. 2 0 0 3 t

. i

. a l

. t i

. a l R a d i P a r k A i s i

. n g . o r

. The bottom row begins empty and dots are added as the initialisation progresses. When the initialisation is complete the Main Screen is displayed. Setting Up When installation has been successfully completed the transmitter must be set up using the front panel conntrols or the VFP. Setting up is detailed in the Operation section of this documentation. When setting up the transmitter, pay particular attention to the Polarities of any functions that have been hard-wired during installation. For example, the polarity of the PTT input and the polarity and configuration of the Antenna Changeover output. Failure to select the correct settings will result in incorrect operation. T6T VHF 50 W Transmitter Page 24 Installation Back to Transmitter Main Page Maintenance Back to Transmitter Main Page Introduction This section gives the scheduled and unscheduled maintenance procedures for the T6T transmitter and shows how to use the Virtual Front Panel (VFP). Scheduled Maintenance A scheduled maintenance procedure is given on page 3. Park Air recommends that this task be completed every twelve months. Unscheduled Maintenance Using the VFP Normally, the T6 transmitter is considered a Line Replaceable Unit

(LRU) and should be replaced with a serviceable spare if a fault occurs. The faulty transmitter should then be returned to Park Air for repair. In certain circumstances, Park Air Customer Support may suggest that the user change one of the transmitter modules. Dismantling and assembly instructions are therefore given under the heading Unscheduled Maintenance starting on page 7. Operating parameters can be set from the transmitter front panel, or by using the VFP. Some additional functions are available from the VFP. See page 18. T6T 50 W VHF Transmitter Page 2 Maintenance Scheduled Maintenance Back to Transmitter Main Page Park Air recommends that scheduled maintenance is carried out at twelve-monthly intervals. Scheduled maintenance comprises the following checks:

Number Check Tools/Test Equipment Required 1 2 3 4 Ensure the equipment is clean and that external connectors are securely fitted. Camel hair brush/clean lint-free cloths Check and reset (if required) the transmitter's frequency standard. VHF Frequency Counter Perform a BIT interruptive test. Perform an ac and dc change-over check (if both supplies are connected). Cleaning and Checking Security of Connectors Remove all dust and dirt from the equipment's exterior using a lint free cloth and camel hair brush. Check all external connections are secure and free from damage. Setting the Transmitters Internal Reference Frequency To set the transmitters internal reference frequency, use the following procedure. Note that references to the switch in the procedure mean the Scroll/Select switch.

(1) Ensure the transmitter does not have an offset

(2) Connect a frequency counter to the front panel Reference connector.

(3) From the Main screen, press the switch to display the Control screen. Turn the switch until Settings is highlighted. Press the switch.

(4) Ensure the Settings is displayed. Turn the switch until Ref Freq is highlighted, then press the switch. screen

(5) With Ref Freq selected turn the switch clockwise or anti-clockwise until the frequency counter reads 20.950000 MHz 10 Hz, then press the switch. F r e q u e n c y C h a n n e l S e t E x i t t i n g s Control Screen B a n d E d g e s R e f F r e q B a c k l i g h t E x i t Settings Screen 5 0 . 0 %

0 3 0 s

(6) Turn the switch clockwise until Exit is highlighted, then press the switch. You are returned to the Main screen.

(7) Disconnect the frequency counter. T6T 50 W VHF Transmitter Page 3 Maintenance Back to Transmitter Main Page

(8) If not 5-carrier offset, refer to AM Voice Mode Settings Screen in the Operation section of this document and set to the required offset.

(9) If 5-carrier offset is required, restore the carrier offset using the following routine:

Connect a 50 ohm frequency counter, through a 60 dB attenuator, to the transmitters rear panel Antenna connector (see Fig 1 for location of the Antenna connector). Refer to AM Voice Mode Settings Screen in the Operation section of this document and set the desired 5-carrier offset. Refer to Changing the Transmitters Operating Frequency in this document and set the transmitter to the nearest 25 kHz channel frequency. For example, if the required frequency is 124.504 (+4 kHz offset), set the transmitter to 124.500 MHz. Key the transmitter and adjust the reference frequency, using the front panel Scroll/Select control, until the frequency counter displays the required operating frequency. For example 124.504 MHz. When the frequency counter displays the exact operating frequency, press the Scroll/Select control and stop keying the transmitter. Disconnect the test equipment and reconnect the antenna. T6T 50 W VHF Transmitter Page 4 Maintenance Back to Transmitter Main Page To Initiate a BIT Test An interruptive BIT test cannot be initiated in Mode 2 or Mode 3. During an interruptive BIT test, the transmitter radiates modulated carrier waves at the set power. Users should therefore obtain the necessary authority before initiating a test. If the test is to be carried out with the antenna disconnected, ensure a load is fitted to the transmitter's Antenna connector. In order to test the line input stages, an internally generated 1 kHz tone is injected into the line input circuit. Any other audio present on the line input will cause the test to be inaccurate. Therefore the transmitter MUST NOT be keyed during the test.

(1) From the Main screen, press the switch to display the Control screen. Turn the switch until BIT is highlighted. Press the switch. B I T S / W C o n f i g S t a n d b y E x i t

(2) Ensure the BIT menu is displayed. Turn the switch until BIT Initiate is highlighted. Press the switch. B I T E T I I n i t i a t e 0 0 0 0 0 : 0 0 h r s A C S u p p l y E x i t O N

(3) During the test, which takes approximately is the Testing screen two seconds, displayed. T e s t i n g P l e a s e W a i t

(4) After the test, either a Pass or Fail screen is displayed. Selecting OK takes the user back to the BIT screen. T e s t S t a t u s P A S S

(5) If fail is displayed, scroll through the screen to check the cause of the failure. T e s t S t a t u s F A I L O K O K T6T 50 W VHF Transmitter Page 5 Maintenance Back to Transmitter Main Page AC and DC Change-over Check If both ac and dc input supplies are connected to the transmitter, carry out the following check:

(1) Confirm that both ac and dc supplies are connected to the transmitter. Ensure that the rear panel Power switch is set to the I (on) position.

(2) Confirm that the front panel Ready indicator is lit, the LCD is illuminated, and the transmitter is operational.

(3) Switch off the ac supply from its source.

(4) Check that the transmitter continues to operate correctly from the dc supply. If accessed, the front panel BIT screen will show AC Supply as off, and DC supply as on. The value of the dc supply is also shown. T6T 50 W VHF Transmitter Page 6 Maintenance Back to Transmitter Main Page Unscheduled Maintenance WARNING Dangerous Voltages The instructions given in this document involve connecting dangerous voltages to the transmitter. Maintenance should be carried out only by suitably qualified personnel. When an ac supply is connected, dangerous voltages are present within the transmitter. Care must be taken by personnel to avoid accidental contact with exposed circuitry during maintenance or alignment procedures. When the power switch is set to the Standby position, dangerous voltages are still present in the transmitter's internal power supply circuitry. To ensure safe working, the ac and dc input supplies must be disconnected from the transmitter. WARNING Antenna Radiation The antenna used with the transmitter must be installed such that the resultant radiated field strength is below 10 W/m in areas normally accessible to personnel. Caution ESSDs The T6 transmitter's circuitry contains Electrostatic Sensitive Devices (ESSDs). Personnel must be aware of the precautions necessary to prevent damage to such devices. Caution Unauthorized Modifications Changes or modifications made to this equipment that are not expressly approved by Park Air, or parties authorized by Park Air, could void the users authority to operate the equipment. Caution Repairs When carrying out repairs to the PA module, care must be taken not to damage the gasket. If the strips become damaged, they must be replaced. Failure to comply with this instruction may compromise the transmitters Electromagnetic Compatibility (EMC) and breach European Commission regulations. When screws are inserted into the transmitter PA casting care must be taken not to exceed a torque of 6 Ibs/inch when tightening. This applies when replacing the top and bottom covers and during the refitting of the PA module. T6T 50 W VHF Transmitter Page 7 Maintenance Back to Transmitter Main Page Introduction This document provides the user with detailed instructions on the removal and replacement of modules and assemblies.

(1) When removing or refitting modules, observe antistatic handling precautions.

(2) Do not change any potentiometer (or link) settings unless detailed in these instructions. Potentiometers have been set using specialist equipment.

(3) The transmitter uses the following Molex KK connectors:

CN2 on the PA Control module CN7 and CN6 on the PSU Regulator module. To remove KK type connectors:

Free the locking mechanism on the connector by moving one side of the connector up, then move the other side up (see the following diagram). The upward motion should only be as far as needed to free the locking mechanism DO NOT pull the cable to free the connector Note that KK type connectors are designed to be removed in this manner to free the locking mechanism. Do not use this procedure with non-KK type connectors as damage to the connector may occur. Lift 1 Lift 2 PCB Tools, Materials and Test Equipment Required The following tools, materials and test equipment should be made available to complete the maintenance tasks described in this section:

Personal Computer (PC) General Purpose Tool kit (including a 1.5 mm Allen key) 5 mm Nut Spinner Camel Hair Brush Clean Lint-free Cloths Frequency Counter Power Meter Dummy Load PC to Radio Interconnection Lead

(Park Air part number 17E12600001) SMB to BNC Lead for reference frequency

(Park Air part number 17K11000004) T6T 50 W VHF Transmitter Page 8 Maintenance Back to Transmitter Main Page Top Cover To remove the top cover, locate and unscrew the 18 countersunk screws securing the top cover to the mainframe. Access can then be gained to the following modules:

Processor module PSU Regulation module Power Supply (requires top cover and bottom cover to be removed) RF PA module (requires top cover and bottom cover to be removed) Front Panel assembly PCB (requires top cover and bottom cover to be removed) Removing and Refitting the Processor Module The Processor module is located as shown in Fig 3. A module removal diagram is shown in Fig 4. WARNING Dangerous Voltages Dangerous voltages are present within the transmitter. Care must be taken by personnel to avoid accidental contact with exposed circuitry when the top cover is removed and power is applied to the radio. Removal Before attempting to remove the Processor module, and if possible, save the radios settings. To achieve this connect a PC with the VFP software loaded to the radio using the PC to Radio Interconnection Lead

(Park Air part number 17E12600001). With the VFP software active, upload the radio settings to a specified file. Ensure that the transmitter is isolated from the ac and dc input supplies. Then proceed as follows:

(1) Unscrew the 18 countersunk screws and remove the transmitters top cover.

(2) Locate the Processor module (Fig 3) and disconnect the following connectors (Fig 4):

CN1 50-way connector (50-way ribbon cable from PA Control module) CN3 14-way connector (14-way ribbon cable from PSU Regulator module) CN4 34-way connector (34-way ribbon cable from Front Panel module).

(3) Gain access to the rear of the transmitter. Using a 5 mm nut spinner tool, remove the four screwloc 8 mm-4-40 UNC screws that secure the Processor module interface connectors CN5 and CN6 to the rear panel.

(4) Remove the seven M3 x 8 mm screws that secure the module to the transmitters mainframe.

(5) Remove the module from the chassis. Refitting To refit the Processor module, proceed as follows:

(1) Place the module in position. Ensure no wires are trapped by the module. Ensure jumper J2 on the module is set to T for transmitter (see the following diagram). T6T 50 W VHF Transmitter Page 9 Maintenance Back to Transmitter Main Page JP2 Shown set for transmitter T2 T3 T S 7 C84 IC38 T T R/TR R/TR IC19 IC20 IC21 IC25 IC27

(1) Ensure the modules interface connectors CN5 and CN6 are located correctly and are aligned with the screw holes in the rear panel. Fit the four screwloc 8 mm-4-40 UNC screws and wavy washers but leave them loose.

(2) Fit the 11 (Mod Strike 5 modules), 7 (Mod Strike 6 and 7 modules) M3 x 8 mm screws that secure the module to the transmitters mainframe, but leave them loose.

(3) Using a 5 mm nut spinner, tighten the four screwloc 8 mm-4-40 UNC screws and wavy washers that secure the connectors; then tighten the 11 (Mod Strike 5 modules), 7 (Mod Strike 6 and 7 modules) M3 x 8 mm screws that secure the module to the transmitters mainframe.

(4) Refit the following connectors to the module:

CN1 50-way connector (50-way ribbon cable from PA Control module). CN3 14-way connector (14-way ribbon cable from PSU Regulator module). CN4 34-way connector (34-way ribbon cable from Front Panel module).

(5) Re-establish the ac and/or dc supplies (take heed of the warning on page 9).

(6) Switch power on at the radio using the rear mounted Power switch.

(7) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.

(8) If a new module has been fitted, connect the VFP PC to the radio using the PC to Radio Interconnection Lead, Park Air part number 17E12600001 (if not already connected). Note that any module sent from Park Air as a spare for a particular radio will be programmed with compatible operating and Fill software. Park Air keeps records of module software in all radios supplied. Care must be taken when using a module removed from another radio as this module may not have compatible software.

(9) Download the saved radio settings from file using the VFP. Alternatively, the settings can be edited by hand as described in the Operation section of this document Once entered, ensure the required settings appear in the VFP screen.

(10) Carry out the Calibrate routine using the VFP, as detailed in the procedure To Calibrate the Transmitter on page 22.

(11) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.

(12) Set the transmitters internal reference frequency by carrying out the procedure detailed on page 3. T6T 50 W VHF Transmitter Page 10 Maintenance Back to Transmitter Main Page

(13) Remove the VFP connector and switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter from the ac and/or dc supplies.

(14) Refit the transmitters top cover (take note of repairs caution (1) on page 7 before carrying out this task). The transmitter can now be returned to service. Removing and Refitting the PSU Regulator Module The PSU Regulator module is located as shown in Fig 3. A module removal diagram is shown in Fig 5. Removal Before attempting to remove the PSU Regulator module, ensure that the transmitter is isolated from the ac and dc input supplies. Then proceed as follows:

(1) Remove the transmitters top cover as described on page 9 (take heed of the warning).

(2) Locate the PSU Regulator module and remove the three M3 x 8 mm captive washer screws that secure the module to the transmitters mainframe.

(3) Carefully raise the module to gain access to the module connectors.

(4) Disconnect the following connectors:

CN5 10-way connector (10-way ribbon cable to PA Control module) CN6 6-way connector (2-way loom to power supply). Note caution (3) on page 8 CN4 14-way connector (14-way ribbon cable to Processor module) CN3 3-way connector (3-wire loom to PA module) CN7 3-way connector (3-wire loom to rear panel On/Off switch). Note caution (3) on page 8 CN2 2-way connector (2-wire loom from dc input connector on rear panel) CN1 4-way connector (4-wire cable from power supply) CN9 2-way connector (2-wire cable ac input to power supply) CN8 3-way connector (2-wire loom to rear panel ac input connector plus chassis connection).

(5) Remove the module from the chassis. Refitting To refit the PSU Regulator module, proceed as follows:

(1) While holding the module in position, connect the following connectors:

CN8 3-way connector (2-wire loom to rear panel ac input connector plus chassis connection) CN9 2-way connector (2-wire cable ac input to power supply) CN1 4-way connector (4-wire cable from power supply) CN2 2-way connector (2-wire loom from dc input connector on rear panel) CN7 3-way connector (3-wire loom to rear panel On/Off switch) CN3 3-way connector (3-wire loom to PA module) CN4 14-way connector (14-way ribbon cable to Processor module) CN6 6-way connector (2-way loom to power supply) CN5 10-way connector (10-way ribbon cable to PA Control module). Locate the module in position. Ensure no wires are trapped by the module.

(2) T6T 50 W VHF Transmitter Page 11 Maintenance Back to Transmitter Main Page

(3) Secure the module to the transmitters mainframe using the three M3 x 8 mm captive washer screws removed during the removal procedure.

(4) Re-establish the ac and/or dc supplies (take heed of the warning on page 7).

(5) Switch power on at the radio using the rear mounted Power switch.

(6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.

(7) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.

(8) Switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter from the ac and/or dc supplies.

(9) Refit the transmitters top cover. The transmitter can now be returned to service. Bottom Cover To remove the bottom cover, locate and unscrew the 15 countersunk screws securing the bottom cover to the mainframe. Access can then be gained to the following modules:

PA Control module Power Supply (requires top and bottom covers to be removed) PA module (requires top and bottom covers to be removed) Front Panel assembly (requires top and bottom covers to be removed). WARNING Dangerous Voltages Dangerous voltages are present within the transmitter. Care must be taken by personnel to avoid accidental contact with exposed circuitry when the bottom cover is removed and power is applied to the radio. Removing and Refitting the PA Control Module The PA Control module is located as shown in Fig 3. A module removal diagram is shown in Fig 6. Removal Before attempting to remove the PA Control module, ensure that the transmitter is isolated from the ac and dc input supplies. Then proceed as follows:

(1) Remove the transmitters bottom cover as described above (take heed of the warning).

(2) Locate the module and disconnect the following connectors:

CN1 50-way connector (50-way ribbon cable from Processor module) CN6 10-way connector (10-way ribbon cable from PSU Regulator module) CN5 SMB connector (reference frequency) CN3 SMB connector (RF drive) CN4 SMB connector (forward power sense) CN2 6-way connector (5-wire loom to PA module).

(3) Remove the seven M3 x 8 mm captive washer screws that secure the module to the transmitters mainframe.

(4) Remove the module from the chassis. T6T 50 W VHF Transmitter Page 12 Maintenance Back to Transmitter Main Page Refitting To refit the PA Control module, proceed as follows:

(1) Place the module in position. Ensure no wires are trapped by the module.

(2) Fit the seven M3 x 8 captive washer screws that secure the module to the transmitters mainframe.

(3) Refit the following connectors to the module:

CN2 6-way connector (5-wire loom to PA module) CN4 SMB connector (forward power sense) CN3 SMB connector (RF drive) CN5 SMB connector (reference frequency) CN6 10-way connector (10-way ribbon cable from PSU Regulator module) CN1 50-way connector (50-way ribbon cable from Processor module).

(4) Re-establish the ac and/or dc supplies (take heed of the warning on page 12).

(5) Switch power on at the radio using the rear mounted Power switch.

(6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.

(7) Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure To Calibrate the Transmitter on page 22.

(8) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.

(9) Set the transmitters internal reference frequency by carrying out the procedure detailed on page 3.

(10) Remove the VFP connector and switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter from the ac and/or dc supplies.

(11) Refit the transmitters bottom cover. The transmitter can now be returned to service. Removing and Refitting the Power Supply The Power Supply is located as shown in Fig 3. A module removal diagram is shown in Fig 7. Removal Before attempting to remove the Power Supply, ensure that the transmitter is isolated from the ac and dc input supplies. Then proceed as follows:

(1) Remove the transmitters top and bottom covers as described on page 9 and page 12 (take heed of the warnings on those pages).

(2) Support the radio on its side.

(3) Locate the power supply. From the bottom half of the unit remove the four No. 6 x 32 UNC countersunk screws that secure the power supply to the transmitters mainframe. During this operation support the power supply from the top half of the unit.

(4) Withdraw the power supply from the chassis sufficient to allow access to the power terminal blocks taking care not to damage the ac terminal plastic supply guard.

(5) Remove the connector CN4 (power supply to the power regulator).

(6) Disconnect the dc wires from the eight connector terminal block. T6T 50 W VHF Transmitter Page 13 Maintenance Back to Transmitter Main Page

(7) Slide back the terminal block cover and disconnect the ac wires from the three connector terminal block (marked L N E).

(8) Carefully remove the power supply from the transmitter. Refitting

(1) With the transmitter on its side hold the power supply near to its securing position in the top half of the radio.

(2) Slide back the terminal block cover and connect the ac wires to the three connector terminal block (marked L N E); brown to terminal L, blue to terminal N and yellow/green to terminal E.

(3) Connect the dc wires to the eight connector terminal block; red to terminal 2 and terminal 3 and black to terminal 6 and terminal 7.

(4) Connect connector CN4.

(5) Taking care not to damage the plastic supply guard, lower the power supply into position and secure from the bottom half of the unit using the four countersunk screws.

(6) Re-establish the ac and/or dc supplies.

(7) Switch power on at the radio using the rear mounted Power switch.

(8) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.

(9) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.

(10) Switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter from the ac and/or dc supplies.

(11) Refit the transmitters top and bottom covers. The transmitter can now be returned to service. Removing and Refitting the PA Module The PA module is located as shown in Fig 3. A module removal diagram is shown in Fig 8. Removal Before attempting to remove the PA module, ensure that the transmitter is isolated from the ac and dc input supplies. Then proceed as follows:

(1) Remove the transmitters top and bottom covers as described on page 9 and page 12 (take heed of the warnings on those pages).

(2) Remove CN3 from the PSU Regulator module.

(3) With the transmitter upside-down disconnect CN2 from the PA Control module.

(4) Disconnect the SMB connectors CN8 and CN10. Note that CN10 is located within the heatsink fins and should be disconnected using long nosed pliers. Do not attempt to remove the connector by pulling on the cable.

(5) Remove the black equipment handle from the PA side of the radio by unscrewing and removing the two M5 x 16 mm panhead screws that secures it to the transmitter.

(6) Remove the six M3 x 8 mm countersunk screws and two M3 x 8 mm captive screws that secure the PA from the bottom and top of the mainframe as shown in Fig 8. Ensure the PA module is well supported during this operation.

(7) Withdraw the PA module from the mainframe taking care not to snag the wiring looms. T6T 50 W VHF Transmitter Page 14 Maintenance Back to Transmitter Main Page Refitting To refit the PA module, proceed as follows:

(1) Place the module in position and butt it up to the mainframe. Ensure no wires are trapped by the module.

(2)

(3) Fit the six M3 x 8 countersunk screws and two M3 x 8 mm captive screws that secure the module to the transmitters mainframe. Fit the black equipment handle to the PA side of the radio using the two M5 x 16 mm panhead screws.

(4) Connect the SMB connectors CN8 and CN10. Note that CN10 is located within the heatsink fins and should be connected using long nosed pliers if unable to use fingers in the enclosed space.

(5) With the transmitter upside-down connect CN2 to the PA Control module.

(6) Fit CN3 to the PSU Regulator module.

(7) Re-establish the ac and/or dc supplies.

(8) Switch power on at the radio using the rear mounted Power switch.

(9) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.

(10) Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure To Calibrate the Transmitter on page 22.

(11) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.

(12) Remove the VFP connector and switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter from the ac and/or dc supplies.

(13) Refit the transmitters top and bottom covers. The transmitter can now be returned to service. Removing and Refitting the Front Panel Assembly PCB The Front Panel assembly is located as shown in Fig 3. An assembly and PCB removal diagram is shown in Fig 9. Removal Before attempting to remove the Front Panel assembly PCB, ensure that the transmitter is isolated from the ac and dc input supplies. Then proceed as follows:

(1) Remove the transmitters top and bottom covers as described on page 9 and page 12 (take heed of the warnings on those pages).

(2) Disconnect CN4 at the Processor module. Carefully pull the cable through the aperture in the mainframe to free it.

(3) Disconnect SMB connector CN5 at the PA Control module.

(4) Remove the four M3 x 8 mm countersunk screws from the bottom and top of the mainframe box section (see Fig 9, Diagram A).

(5) Remove the two black equipment handles by unscrewing and removing the four M5 x 16 mm panhead screws that secure them to the transmitter. The front panel can now be moved forward and away from the mainframe.

(6) At the front panel, release the control knob by unscrewing the Allen head grub screw using a 1.5 mm Allen key. Withdraw the control knob from the spindle. T6T 50 W VHF Transmitter Page 15 Maintenance Back to Transmitter Main Page

(7) Remove the Front Panel PCB from the Front Panel assembly by removing the six M3 x 6 mm panhead screws and wavy washers (see Fig 9 Diagram B). Refitting To refit the Front Panel assembly PCB, proceed as follows:

(1) Place the PCB in position at the Front Panel assembly. Ensure the spindle of the control knob and microphone/diagnostics connector are correctly located. Secure the PCB to the Front Panel assembly using the six M3 x 6 mm panhead screws and wavy washers (see Fig 9, Diagram B).

(2) At the front panel, place the control knob onto the spindle and using a 1.5 mm Allen key, secure the Allen head grub screw.

(3) Secure the Front Panel assembly to the top and bottom of the mainframe box section using the four M3 x 8 mm countersunk screws. Fit the two black equipment handles using the four M5 x 16 mm panhead screws (see Fig 9, Diagram A).

(4) Route the ribbon cable to the Processor module connector CN4 and connect it.

(5) Route the SMB connector to CN5 on the PA Control module and connect it.

(6) Re-establish the ac and/or dc supplies.

(7) Switch power on at the radio using the rear mounted Power switch.

(8) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.

(9) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.

(10) Switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter from the ac and/or dc supplies.

(11) Refit the transmitters top and bottom covers. The transmitter can now be returned to service. Removing and Refitting the Cooling Fan The cooling fan is at the rear of the PA module as shown in Fig 3. An assembly and removal diagram is shown in Fig 10. Removal Before attempting to remove the fan, ensure that the transmitter is isolated from the ac and dc input supplies. Then proceed as follows:

(1) Disconnect the two-pin connector.

(2) Remove fan's finger guard.

(3) Using an Allen key, inserted through the holes in the fan exposed with the finger guard removed, remove the three M4 x 12 mm caphead Allen screws that secure the fan to the PA module heatsink.

(4) Remove the fan from the PA module. Refitting To refit the cooling fan, proceed as follows:

(1) Locate the fan in position and using a suitable Allen key inserted through the holes for the fan's finger guard, secure using the three M4 x 12 mm caphead Allen screws.

(2) Secure the finger guard to the fan. T6T 50 W VHF Transmitter Page 16 Maintenance Back to Transmitter Main Page

(3) Connect the 2-pin fan connector to the fan. Ensure the + marked socket mates with the + marked plug on the fan.

(4) Re-establish the ac and/or dc supplies.

(5) Switch power on at the radio using the rear mounted Power switch.

(6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit. The transmitter can now be returned to service. T6T 50 W VHF Transmitter Page 17 Maintenance Back to Transmitter Main Page Virtual Front Panel (VFP) Virtual Front Panel (VFP) software is supplied on CD-ROM and is compatible with any PC or laptop running Windows 2000 or Windows XP. The VFP allows changes to a radios settings and channel information, it displays the current BIT state, displays BIT history, allows security locks to be set, and provides maintenance facilities. A radio can be set up using the front panel Scroll/Select switch and LCD, or by using the VFP. Using the VFP has several advantages over setting the transmitter from the front panel; these are:

A profile of the transmitters operation settings and channel information can be created, stored on disk, and then recalled to download into other transmitters. A print out of the transmitters profile can be made from the VFP. Front Panel Lock is available only when using the VFP. As part of the transmitters Settings (see typical screen display shown below), Front Panel Lock can be set to ON. When selected to on, no settings or frequency information can be changed from the front panel. If the transmitter is part of a MARC system or operates in a digital mode, a MARC Lock, HDLC Lock and T1E1 Lock are available when using the VFP. When selected to on, no settings or frequency information can be changed from the MARC equipment screen, or the digital control equipment. Typical VFP Screen - AM-Voice Profile Shown T6T 50 W VHF Transmitter Page 18 Maintenance Back to Transmitter Main Page Installing the VFP Software The VFP software is supplied by Park Air on CD-ROM. The software can be run from the Main page or installed on your PC via Explorer. To install the software onto your PC:

(1) Using explorer, display the contents of the CD-ROM supplied by Park Air. Identify the file named S0473Vxx.EXE (where xx is the version number).

(2) Using the mouse, right click on the file and then select Copy.

(3) Display the Windows desktop. Right click anywhere on the desktop and select Paste.

(4) Check that the VFP icon is shown on the desktop. Reposition the icon as required. The VFP application is now installed on the PCs desktop. VFP Icon VFP Features The VFP screen is divided into four main windows: Settings, Channels, BIT and Status Information. Four colours are used to display text. The colours have the following meanings:

Black indicates a valid parameter that has been accepted by the radio. Red indicates an invalid parameter that has been rejected by the radio, or a BIT failure. Green indicates text that has not yet been downloaded to the radio. Text loaded into the VFP from a previously stored file, or any text that is manually amended is green until it is downloaded into the radio; after being downloaded into the radio the text changes to black, or if it is invalid, to red. Blue indicates Help text and is shown in the Status Information window. The Menu Bar The menu bar has four categories: File, Serial Port, Radio and Help. FileHas the sub-categories: Open, Save and Print. These sub-categories allow the user to open previously saved profiles, save a new profile, or print a profile. A special sub-category: File > Save > Diagnostics should only be used when advised by Park Air. Serial PortHas the sub-categories: Com 1 and Com 2. Before the VFP can be used, the appropriate Com 1 or Com 2 must be selected to correspond with the PCs Com Port used for the radio connection. RadioHas the sub-categories: Retrieve, Send, Calibrate and Test. This category allows a radios profile to be loaded into the VFP, allows a profile to be downloaded from the VFP to a radio, calibrates a radio and initiates a BIT test. HelpProvides detail about the VFP software. Settings Window This window lists all attributes that can be adjusted by the user. If any individual attribute is clicked on using the mouse, help information is displayed in the Status Information window showing the range of adjustment for that attribute. Click on the value and use the keyboard to amend it; press Enter to confirm the new value noting that the amended text is green until it is downloaded into the radio. T6T 50 W VHF Transmitter Page 19 Maintenance Back to Transmitter Main Page Any invalid parameters are not indicated until the Settings are downloaded to the radio. It is the radio that rejects invalid parameters, not the VFP. The transmitters reference frequency setting is displayed in the window. Adjusting the reference frequency is a maintenance operation that requires external test equipment to be connected. The value shown in the Settings window should not be changed; instead, adjustment of the reference frequency should be performed using the radios front panel controls as detailed on page 3. Channels Window Up to 100 preset channels can be stored in the radio. These are listed in the Channels window. Any channel frequency can be amended by clicking on the value to amend it and pressing Enter to confirm the new value. Note that the amended channel is green until it is downloaded into the radio. Any invalid frequencies are not indicated until the Channels are downloaded to the radio. It is the radio that rejects invalid frequencies, not the VFP. BIT Window Two lists of information are presented. The current BIT status and the BIT history. The BIT history shows the last 100 entries. Status Information Window The Status Information window gives information regarding the type of radio, the software fills, recent VFP actions and Help information. To Change the Transmitters Profile or Save a Profile

(1) Using a radio to PC serial interconnection lead, Park Air part number 17E12600001, connect the radios front panel Microphone/Diagnostics connector to the PCs Com Port 1 or Com Port 2

(note which Com Port is used).

(2) Run up the VFP software and check that a blank VFP screen (as shown below) is displayed. T6T 50 W VHF Transmitter Page 20 Maintenance Back to Transmitter Main Page Blank VFP Screen

(3) At the Menu Bar, click on Serial Port and select either Com 1 or Com 2. The selection must correspond to the port used to connect to the radio.

(4) Load the required information from the radio, or from a stored file. The required information can be radio settings, frequency channels, BIT information, or all of these. To load a previously stored file, selectFile > Open > All or,File > Open >Settings or,File > Open > Channel or,File > Open > BIT To load information from the radio, selectRadio > Retrieve > All or,Radio > Retrieve > Settings or,Radio > Retrieve > Channel or,Radio > Retrieve > BIT

(5) If required, amend any radio Settings or Channel information.

(6) Download the radios profile as shown on the VFP screen to either the radio, or to a file. To download into the radio, select Radio > Send > All or,Radio > Send > Settings or,Radio > Send > Channel To download to a file, selectFile > Send > All or,File > Send > Settings or,File > Send > Channel or,File > Send > BIT T6T 50 W VHF Transmitter Page 21 Maintenance Back to Transmitter Main Page

(7) Check that after downloading to a radio, no invalid parameters are returned (such parameters are displayed as red text). If there are invalid parameters, amend them and then repeat the download.

(8) When there is no further requirement for using the VFP, exit the VFP software and disconnect the radio from the PC. To Initiate a BIT Test During an interruptive BIT test, the transmitter radiates modulated carrier waves at the set power. Users should therefore obtain the necessary authority before initiating a test. If the test is to be carried out with the antenna disconnected, ensure a load is fitted to the transmitter's antenna connector. In order to test the line input stages, an internally generated 1 kHz tone is injected into the line input circuit. Any other audio present on the line input will cause the test to be inaccurate. Therefore the transmitter must not be keyed during the test.

(1) Using a radio to PC serial interconnection lead, Park Air part number 17E12600001, connect the radios front panel Microphone/Diagnostics connector to the PCs Com Port 1 or Com Port 2

(note which Com Port is used).

(2) Run up the VFP software and check that a blank VFP screen is displayed.

(3) At the Menu Bar, click on Serial Port and select either Com 1 or Com 2. The selection must correspond to the port used to connect to the radio.

(4) At the Menu Bar select Radio > Test.

(5) An interruptive BIT test now takes place. The results are displayed in the BIT window.

(6) If there is no further requirement for using the VFP, exit the VFP software and disconnect the radio from the PC. To Calibrate the Transmitter

(1) Connect a dummy load via a power meter to the transmitters Antenna connector.

(2) Remove the transmitters bottom cover.

(3) Using a radio to PC serial interconnection lead, Park Air part number 17E12600001, connect the radios front panel Microphone/Diagnostics connector to the PCs Com Port 1 or Com Port 2

(note which Com Port is used).

(4) Run up the VFP software and check that a blank VFP screen is displayed.

(5) At the Menu Bar, click on Serial Port and select either Com 1 or Com 2. The selection must correspond to the port used to connect to the radio.

(6) At the Menu Bar select Radio > Retrieve > All.

(7) At the Menu Bar select Radio > Calibrate. The Confirm screen will then be displayed to remind you that a dummy load must be connected before proceeding. T6T 50 W VHF Transmitter Page 22 Maintenance Back to Transmitter Main Page

(8) With the Confirm screen displayed and dummy load connected, select Yes to continue with the calibrate routine. The Progress screen will then be displayed.

(9) When the PA Control/PA loop has been calibrated the Progress screen disappears and the VFP screen reappears showing a calibration complete message in the Status Information window.

(10) Gain access to the PA Control module and identify RV8 (see component layout diagram on page 24). From the transmitters front panel AM-Voice or AM-MSK Settings screen, select PTT On.

(11) From the Settings pane of the VFP screen, note the RF power setting. Adjust RV8 until the power meter reads this value.

(12) From the transmitters front panel AM-Voice or AM-MSK Settings screen select PTT Off, then remove the power meter and dummy load. This completes the calibration routine.

(13) When there is no further requirement for using the VFP, exit the VFP software and disconnect the radio from the PC. T6T 50 W VHF Transmitter Page 23 Maintenance Back to Transmitter Main Page Small Screening Can R135 R130 R125 R131 C421 CN4 TP10 RV8 R455 R456 D24 R 3 8 2 R 2 4 3 C 4 2 4 R 2 3 1 R348 Location of PA Control Module RV8 Location of RV8 RV8 Figs 1 to 10 follow T6T 50 W VHF Transmitter Page 24 Maintenance Back to Transmitter Main Page Front View T1/E1 HDLC MARC DATA MARC AUDIO MARC FACILITIES AC SUPPLY RATINGS AC SUPPLY 48 - 62Hz

~ 110 - 240V ( +10%) 4A POWER 400VA max FUSE F2 110-240V T4A 250V IEC 110V - 120V T4A 125V UL DC SUPPLY 21.6 - 32V 10A FUSE F1 F15A 32V SEE INSTALLATION INSTRUCTIONS BEFORE CONNECTING SUPPLIES SUPPLY FUSE F1 FUSE F2 ANTENNA DANGER HIGH RF VOLTAGES CONNECT ANTENNA BEFORE USE DISCONNECT SUPPLIES WHEN NOT IN USE DC SUPPLY Rear View SA3597 SA3594 Fig 1 T6T Front and Rear Panels Back to Transmitter Main Page

CN7ACN7ACN7ACN7A

CN7CCN7CCN7CCN7C Pin Number Name Characteristic Pin Number Name Characteristic 1 2 3 4 5 6 7 8 RRING RTIP n/c TRING TTIP n/c n/c n/c ANSI T1.403-1995 (T1), ITU-T: G.703 (E1) ANSI T1.403-1995 (T1), ITU-T: G.703 (E1) 1 2 3 4 5 6 7 8 Data Rx A (Data In -) Data Rx B (Data In +) n/c RS 422 RS 422 Data Tx B (Data Out +) Data Tx A (Data Out -) RS 422 RS 422 Remote Supply On/Off Ground Unregulated Supply 0V 21.6V to 32V

CN7BCN7BCN7BCN7B

CN7DCN7DCN7DCN7D Pin Number Name Characteristic Pin Number Name Characteristic 1 2 3 4 5 6 7 8 HDLC Rx A HDLC Rx B HDLC CL A HDLC Tx B HDLC Tx A HDLC CL B Ground RS 422 RS 422 RS 422 RS 422 RS 422 RS 422 0V Unregulated Supply 21.6V to 32V 1 2 3 4 5 6 7 8 Line In -

Line In +

+20 dBm to -20 dBm 600R

+20 dBm to -20 dBm 600R Fast Antenna Change Over /

PTT NPN open collector grounding transistor Not used Not used PTT Input Ground Not used

+20 dBm to -20 dBm 600R

+20 dBm to -20 dBm 600R 0 V or +10 V to +60 V or

-10 V to -60 V at 6mA 0 V 0 V or +10 V to +60 V or

-10 V to -60 V at 6mA Connections Name Characteristic Connections Name Characteristic Connections Name Characteristic

Processor Front Panel CN4-1 CN4-2 CN4-3 CN4-4 CN4-5 CN4-6 CN4-7 CN4-8 CN4-9 CN4-10 CN4-11 CN4-12 CN4-13 CN4-14 CN4-15 CN4-16 CN4-17 CN4-18 CN4-19 CN4-20 CN4-21 CN4-22 CN4-23 CN4-24 CN4-25 CN4-26 CN4-27 CN4-28 CN4-29 CN4-30 CN4-31 CN4-32 CN4-33 CN4-34 CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8 CN1-9 CN1-10 CN1-11 CN1-12 CN1-13 CN1-14 CN1-15 CN1-16 CN1-17 CN1-18 CN1-19 CN1-20 CN1-21 CN1-22 CN1-23 CN1-24 CN1-25 CN1-26 CN1-27 CN1-28 CN1-29 CN1-30 CN1-31 CN1-32 CN1-33 CN1-34 LED Alarm LED Ready LED Standby LED Tx LCD RS LCD R/W LCD Enable Data 0 Data 1 Data 2 Data 3 Data 4 Data 5 Data 6 Data 7 LCD Backlight Transmit Data

+5 V Supply Receive Data

-5 V Supply Ground

+15 V Supply Ground LED RX (not used) Turn +

Turn -

Push Mic PTT Ground Sidetone (Headset Drive) Loudspeaker Amp Drive Ground Mic Input Ground Open collector (5mA) Open collector (5mA) Open collector (5mA) Open collector (5mA) TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL Open collector (200mA) RS232

+5 V RS232

-5 V 0 V

+15 V 0 V Open collector (5mA) 5 V pull-up 5 V pull-up 5 V pull-up 0 V=PTT,5 V pull-up=PTT 0 V 3 Vac pk-pk 2V p-p maximum 0V 1.6V p-p maximum 0V Connections Name Characteristic Regulation CN4-1 CN4-2 CN4-3 CN4-4 CN4-5 CN4-6 CN4-7 CN4-8 CN4-9 CN4-10 CN4-11 CN4-12 CN4-13 CN4-14 Processor CN3-1 CN3-2 CN3-3 CN3-4 CN3-5 CN3-6 CN3-7 CN3-8 CN3-9 CN3-10 CN3-11 CN3-12 CN3-13 CN3-14

+15 V Supply

+15 V Supply

+5 V Supply

+5 V Supply Ground Ground

-15 V Supply

-15 V Supply ac Detect dc Detect V Unreg V Unreg Remote on/off n/c

+15 V

+15 V

+5 V

+5 V 0V 0V

-15 V

-15 V 15V on, 0V off Open collector 21.6 to 32 V 21.6 to 32 V 0V = off, open collector = on n/c Connections Name Characteristic Regulation CN5-1 CN5-2 CN5-3 CN5-4 CN5-5 CN5-6 CN5-7 CN5-8 CN5-9 CN5-10 PA Control CN6-1 CN6-2 CN6-3 CN6-4 CN6-5 CN6-6 CN6-7 CN6-8 CN6-9 CN6-10

+15 V Supply

+15 V Supply

+5 V Supply

+5 V Supply Ground Ground

-15 V Supply

-15 V Supply ac Detect dc Detect Connections Name External Speaker

+15 V

+15 V

+5 V

+5 V 0V 0V

-15 V

-15 V n/c n/c Characteristic Processor CN8 Tip CN8 Ring CN8 Sleeve 1 2 3 External Speaker Drive 3 Vac pk-pk max External Speaker Drive 3 Vac pk-pk max Ground 0 V Front Panel Microphone/

Diagnostics CN2-1 CN2-2 CN2-3 CN2-4 CN2-5 CN2-6 CN2-7 1 2 3 4 5 6 7 Ground - Microphone Transmit Data MIC PTT Receive Data Sidetone (Headset Drive) Microphone Input Ground 0 V RS232 0 V = PTT, 5 V pull-up = not PTT RS232 3 Vac pk-pk, 200R 6k8 input impedance, 5mV sensitivity 0 V Processor CN6-1 CN6-2 CN6-3 CN6-4 CN6-5 CN6-6 CN6-7 CN6-8 CN6-9 MARC Port 1 2 3 4 5 6 7 8 9 Ground Line In +

Line In -

PTT Input Unregulated Supply Data RX B - Data In +

Data RX A - Data In -

Data TX B - Data Out +

Data TX A - Data Out -

0 V

+20 dBm to -20 dBm 600R

+20 dBm to -20 dBm 600R 0 V or +10 V to +60 V or

-10 V to -60 V at 6mA Fused 500mA, 21.6 to 32 V RS422 RS422 RS422 RS422 Connections Front Panel CN3-1 CN3-2 CN3-3 Name Characteristic Connections Name Characteristic Loudspeaker Output Ground n/c 7.5V pk-pk Max 0 V n/c DC Input Input-1 Input-2 Input-3 Regulation CN2-2 CN2-1 dc Input Ground Supply n/c Fused 21.6 to 32 V 0 V n/c Front Panel CN3 CN1 CN2 Microphone/Diagnostics CN4 CN5 34 3 14 10 Power Supply Regulation CN4 CN5 CN6 CN3 CN7 2 1 3 Supply

(shown in off position)

(Rear Panel) 1 2 CN2 CN8 1 L 2 N 3 E CN9 CN1 L N 1 2 3 4 Connections Name Characteristic Regulator CN3-1 CN3-2 CN3-3 RF PA CN3 Heatsink V Unreg

-33 V Ground Supply 21.6 to 32 V n/c 0 V Connections Name Characteristic Regulation CN6-1 PSU CN6-2 CN6-3 CN6-4 CN6-5 CN6-6 CN4-3 CN4-1 0 V PSU OK PSU OK PSU off 0 V PSU off

(Rear Panel) 0 V 0 V OK o/c OK 0 V = on 0 V PSU off 0V = 0ff Mains IEC Connector Filtered/

Fused L N E ac Input Reference Frequency

(Front Panel) 3 1 dc Input 2

(Rear Panel) Power Supply L N E CN4 CN1 1 2 3 4 Regulation Connections PSU CN1-1 CN1-2 CN1-3 CN1-1 CN1-2 CN1-3 CN1-4 Name Characteristic Ground Supply Ground Supply V Unreg V Unreg 0 V 0 V 29 V 29 V 2 2 Connections Name Characteristic Processor CN2-1 IF n/c CN1-4 Connections Name Characteristic PA CN1-1 Antenna Port RF Output 5 to 50 W Connections Name Characteristic RF PA CN8 PA Control CN4-1 Forward Power Sense 17 dBm 1 dB

(-30.5 dBc 0.9 dB) Connections Name Characteristic PA Control CN3-1 RF PA CN10 RF Drive 1 dBm carrier Connections Name Characteristic PA Control CN5-1 Front Panel CN4-1 Reference Frequency

-20 dBm to 0 dBm PA CN10 CN1 CN8 CN3 CN2 CN4 CN5 CN7 CN9 CN12 CN6 Connections Name Characteristic

A B C D CN7 Processor CN5-1 CN5-2 Facilities 1 2 CN5-3 CN5-4 CN5-5 CN5-6 CN5-7 CN5-8 3 4 5 6 7 8 Ground E Bit PTT External VSWR Antenna Change Over Antenna Change Over Squelch Defeat (not used) 0 V TTL pull-up active low Grounding output +/- 60V, 100mA max. TTL pull-up active low Grounding output +/- 60V, 100mA max. Grounding output +/- 60V, 100mA max. TTL pull-up active low Ground 0 V Connections Processor CN5-9 CN5-10 CN5-11 CN5-12 CN5-13 CN5-14 CN5-15 Facilities 9 10 11 12 13 14 15 T6S2VHF Tx Interconnection and Wiring CN3 A T A D C R A M 1 E

1 T C L D H I O D U A C R A M CN4 CN2 CN1 50 CN5 CN1 CN6 CN3 CN4 CN2 EXT SPKR CN8 MARC CN6

Name Facilities Processor

PA Control CN5 Characteristic 6 Fan 2 Unregulated Supply Inhibit BIT Interruptive Test RSSI (not used) Ready Output Tape Output Reserved Fused 300mA 21.6 to 32 V TTL pull-up active low TTL pull-up active low Potential range 0 V to 10 V Open collector, 0 V = Ready

-10 dBm. 100R n/c Connections Name Characteristic PA Control RF PA CN2-1 CN2-2 CN2-3 CN2-4 CN2-5 CN2-6 CN4 CN2 CN7 CN5 CN9 CN12 PA Temperature Drive Detect PA Bias Enable Fan Enable Reflected Power PA Current Detect (not used) 10 mV/C + 0.5V 0.5 V for +10 dBm TTL - High for bias on TTL - High for fan on 50 W = 670 mV 0.1V per Amp

Connections Name Characteristic Processor CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8 CN1-9 CN1-10 CN1-11 CN1-12 CN1-13 CN1-14 CN1-15 CN1-16 CN1-17 CN1-18 CN1-19 CN1-20 CN1-21 CN1-22 CN1-23 CN1-24 CN1-25 CN1-26 CN1-27 CN1-28 CN1-29 CN1-30 CN1-31 CN1-32 CN1-33 CN1-34 CN1-35 CN1-36 CN1-37 CN1-38 CN1-39 CN1-40 CN1-41 CN1-42 CN1-43 CN1-44 CN1-45 CN1-46 CN1-47 CN1-48 CN1-49 CN1-50 PA Control CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8 CN1-9 CN1-10 CN1-11 CN1-12 CN1-13 CN1-14 CN1-15 CN1-16 CN1-17 CN1-18 CN1-19 CN1-20 CN1-21 CN1-22 CN1-23 CN1-24 CN1-25 CN1-26 CN1-27 CN1-28 CN1-29 CN1-30 CN1-31 CN1-32 CN1-33 CN1-34 CN1-35 CN1-36 CN1-37 CN1-38 CN1-39 CN1-40 CN1-41 CN1-42 CN1-43 CN1-44 CN1-45 CN1-46 CN1-47 CN1-48 CN1-49 CN1-50 Ground IF AGC (Not used) Ground RF AGC (Not used) Ground I Ground BIT I Monitor Ground BIT Q Monitor Ground Q Ground Frequency Trim Tx/Rx Detect Power Down Ground Filter 0 Filter 1 Filter 2 Filter 3 Filter 4 Ground Synth Load Data Clock Phase Load Reserved Tx Key Auto Level Control PA Temperature Reflected Power PAC Temperature External VSWR Narrow/Wide (Not used) BIT Control 0 BIT Control 1 BIT Open Loop BIT Synth Lock BIT Loop Correct BIT VSWR OK RF PA Bias Disable Fan Enable OCXO Fitted Reserved Step Size (Not used) TR Detect V/U Detect BIT Control 2 (Not used) BIT Control 3 (Not used) 0 V 0 to 2.5 V 0 V 0 to 2.5 V 0 V 0 to 2.5 V 0 V 2.5 V 0 V 2.5 V 0 V 0 to 2.5 V 0 V 0 to 4 V / 0 to 6V TTL TTL pull up active low 0 V TTL TTL TTL TTL TTL 0 V TTL TTL TTL TTL TTL TTL 0 to 5 V (5 V 3dB back off) 10 mV / C 0 to 2.5 V 10 mV / C TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL - High fan on TTL - Low OCXO fitted TTL TTL TTL TTL TTL TTL Connections Name Characteristic RF PA CN6 PA Heatsink Fan Fan Fan Control Ground 10V approx. or 26.5V 0V Fig 2 Wiring and Interconnection Diagram Back to Transmitter Main Page Antenna Connector Processor Module Fan VHF TX PA Control Module Regulation Module Power Supply VHF TX RF PA Module Top view - Top Cover removed View on underside - Bottom Cover removed T6 Series 2 VHF Transmitter Module Location Diagram Front Panel Module Tx Module Location Fig 3 Module Location Diagram Back to Transmitter Main Page 8 N A C P GA10931 Fig 4 Processor Module - Removal and Refitting Detail Back to Transmitter Main Page Brown (L) Blue (N) CN8 CN6 CN7 CN2 CN1 CN3 GA10929 Fig 5 PSU Regulator Module - Removal and Refitting Detail CN3 CN4 CN5 This connector will twist on itself CN5 CN4 3 C P Back to Transmitter Main Page Fig 6 PA Control Module - Removal and Refitting Detail Back to Transmitter Main Page Power Supply GA10928 Fig 7 Power Supply - Removal and Refitting Detail Back to Transmitter Main Page GA10930 Fig 8 PA Module - Removal and Refitting Detail Back to Transmitter Main Page CN5 PA Control Allen head grub screw Front panel PCB Diagram A Front Panel Diagram B GA10944, GA10927 Fig 9 Front Panel Assembly PCB - Removal and Refitting Detail Back to Transmitter Main Page AIRFLOW Finger guard power connections here GA10945 Fig 10 Cooling Fan - Removal and Refitting Detail