FCC ID: C8LB63300HS VHF Ground to Air Transmitter

 

T6T 300 Watt VHF Transmitter User Documentation Any errors found in this handbook, or associated equipment handbooks, are promulgated through the Park Air FTP network. Any user can access this information by logging on to:

Errata ftp.parkairsystems.com When logged on, select the public (Pub) folder, then the Handbook Errata Sheets folder, and then select the required equipment model.

[Adobe Acrobat must be loaded on your PC to use this facility.]

Handbook Title:

T6T 300 Watt VHF Transmitter User Documentation Handbook Part Number:

31-3T6T300V Handbook Version:

Date of Issue:

Published By:

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1.1 June 2006 Park Air Systems Northfields Market Deeping Peterborough PE6 8UE England From UK, 01778 345434 From outside UK, 44 1778 345434 From UK, 01778 342877 From outside UK, 44 1778 342877 www.parkairsystems.com Page 2 Health & Safety, EN 60950, CAN/CSA-C22.2 No. 60950, UL 60950. Radio IC RSS141, FCC part 15 and 87. We, the undersigned, Company Address, City Country Phone number Fax number Declaration of Conformity Park Air Systems Limited Northfields, Market Deeping, Peterborough PE6 8UE England

+44 1778 345434

+44 1778 342877 certify and declare under our sole responsibility that the following equipment:

Product description / Intended use EU / EFTA member states intended for use Member states with restrictive use Manufacturer Brand Type Ground to air communications in the VHF aeronautical band All countries None Park Air Systems Limited PAE T6T HS 300 , T6T HS 200 are tested to and conform with the essential requirements for protection of health and the safety of the user and any other person and Electromagnetic Compatibility, as included in following standards:

Standard EN60950-1:2002 EN60215 EN301 489-1, EN301 489-22 Issue date 2002 1989 06/2005, 11/2003 and is tested to and conforms with the essential radio test suites so that it effectively uses the frequency spectrum allocated to terrestrial/space radio communication and orbital resources so to as to avoid harmful interference, as included in following standards:

Standard EN 300 676 Issue date V1.3.1 03/2003 and therefore complies with the essential requirements and provisions of the Directive 1999/5/EC of the European Parliament and of the council of March 9, 1999 on Radio equipment and Telecommunications Terminal Equipment and the mutual recognition of their conformity and with the provisions of Appendix IV (Conformity Assessment procedure referred to in article 10). The following Notified Body has been consulted in the Conformity Assessment procedure:

Notified Body number 0336 Name and address TNO Certification B.V., PO Box 15, 9822 ZG Niekerk, The Netherlands The technical documentation as required by the Conformity Assessment procedure is kept at the following address:

Company Address, City Country Phone number Fax number Park Air Systems Limited Northfields, Market Deeping, Peterborough PE6 8UE England

+44 1778 345434

+44 1778 342877 TCF/TF reference nr. Drawn up in Date TCF-124-008 Northfields, Market Deeping, Peterborough PE6 8UE 10 October 2005 Name and position A. Horsfield consultant Engineer Page 4 Health and Safety T6T 300 Watt VHF Transmitter The T6T 300 watt VHF transmitter operates from a low voltage dc input supply, or a standard mains ac input supply. When using a mains supply, dangerous voltages are present on the rear panel ac connector and within the equipment. For this reason, only suitably qualified personnel should install and maintain the equipment. WARNING Antenna Radiation In use, an antenna is connected to the transmitter. During installation, consideration must be given regarding the resultant field strength in areas accessible to personnel. The formula to determine the field strength is given in the Installation topic. WARNING Beryllium Hazard The output transistors used in the power amplifier (PA) of this transmitter contain the toxic material beryllium. Beryllium oxide dust is toxic if inhaled. Although no procedures in this documentation instruct component removal, users should be aware that there could be a hazard if a PAs output transistors become physically damaged. WARNING Lifting the Transmitter The transmitter weighs approximately 79 kg. When lifting a transmitter, especially when fitting into an equipment cabinet, a minimum of two people should be used. Failure to do so can result in personal injury. Disposal This product is covered by the European Directive 2002/96/EC. It must not be disposed of in domestic waste. Disposal should be made using designated collection facilities appointed by the government or the local authorities in your area. Page 5 Warnings and Cautions The following warnings and cautions are used in Park Air documentation. Warnings A warning is used to indicate possible danger to personnel. Throughout Park Air user documentation, warnings are indicated by the following symbols:

WARNING Indicates electrical danger to personnel. WARNING Indicates a hazardous material. WARNING Indicates a non-ionizing radiation hazard. WARNING Indicates a specified danger to personnel. Cautions A caution is used to indicate possible danger to the equipment. Throughout Park Air user documentation, cautions are indicated by the following symbols:

Caution Indicates the presence of electrostatic sensitive devices (ESDs). Caution Indicates a specified danger to the equipment. Page 6 Customer Support Contacting Park Air Customer support is available using email, telephone or fax. If you require help in configuring, installing or maintaining equipment supplied by Park Air, use any of the contact methods listed below. Email Address:

support@uk.parkairsystems.com Telephone During normal UK office hours:

+44 1778 381557 Outside normal UK office hours: +44 7733 124457 Fax Fax number:

Mail Address:

+44 1778 381556 Customer Services Department Park Air Systems Northfields Market Deeping Peterborough PE6 8UE England Web Site Web address:

www.parkairsystems.com Fault Reporting To ensure that Park Air continues to offer the highest level of after sales service, it is necessary to gather as much information as possible about equipment faults. If any equipment supplied by Park Air becomes unserviceable, please complete a copy of the fault report shown on the next page, and return it to the Customer Services department at Park Air. Page 7 Fault Report Customer:

. Address:

. Telephone:

. Email:

Fax:

. Equipment Details Park Air works order number . Equipment model . Equipment serial number . Service Details Commissioning date. Failure/repair date . Software version (if known) . Supply voltage . Equipment environment: Office area / dedicated equipment room / heated / air-conditioned

(delete as applicable) Fault Detail Symptoms of fault:

. Results of any tests:

. Any repairs carried out:

. Comments/action requested: . Page 8 The following list gives the standard abbreviations used in Park Air user documentation. Abbreviations A ac AGC AM ATC BER BIT C CAS CCE CD ampere alternating current automatic gain control amplitude modulation air traffic control bit error rate built-in test celsius channel associated signalling control centre equipment compact disk CSMA carrier sense multiple access dB dBm dc DSB decibel decibels relative to 1 mW direct current double sideband D8PSK differentially encoded 8-phase shift keying E1-RIC E1-radio interconnect E-BIT external bit signal EMF ESD ETSI Fig FM g HPA Hz ICAO electromagnetic force electrostatic sensitive device European Telecommunications Standards Institute figure frequency modulation gramme high power amplifier hertz international civil aviation organization IF intermediate frequency kbits/s kilobits per second kg kHz LCD kilogramme kilohertz liquid crystal display LED LRU m mA light emitting diode line replaceable unit metre milliamp MARC multi-access remote control Mbits/s megabits per second MHz mm ms MSK mV mW PA PC PCB PCU megahertz millimetre millisecond minimum shift keying millivolt milliwatt power amplifier personal computer printed circuit board protocol conversion unit pk-pk peak-to-peak ppm PSU PTT PVC RCMS RF RSE2 RSSI SINAD parts per million power supply unit press to transmit polyvinyl chloride remote system control and monitoring radio frequency remote site equipment radio signal strength indication signal plus noise plus distortion to noise plus distortion ratio S+N/N signal plus noise to noise ratio TDMA time division multiple access TS UHF W V VA time slot ultra high frequency microwatt volt volt-ampere Page 9 VCCS VFP VHF voice control and communication switch virtual front panel very high frequency VOGAD voice-operated gain adjusting device W watt Page 10 Table of Contents Page 3 5 7 9 15 16 18 18 19 19 19 21 22 22 22 22 22 23 23 23 23 24 24 24 24 24 24 24 24 25 25 25 25 25 25 25 25 26 26 26 26 26 26 26 Approvals and Standards Health and Safety Customer Support Abbreviations Overview Purpose Models and Part Numbers Mechanical Installation Operating Parameters Frequency Selection Virtual Front Panel Specification General Specification Variants Number of Channels Frequency Accuracy Power Requirements Dimensions and Weight Transmitter Combiner Environmental AM Modes Transmitter RF Characteristics Output Impedance RF Power Output Duty Cycle Channel Spacing Offset Carrier Harmonic Outputs Spurious Outputs Intermodulation Transmitter Modulation Characteristics Mode Modulation Depth Hum and Noise Frequency Response Distortion Residual FM VOGAD Mute Differential Group Delay Transmitter Control Audio Inputs PTT Time Out Page 11 Table of Contents (continued) Page Mode 2 RF Power Rise Time RF Power Decay Time Channel Spacing Transmitter Modulation Characteristics Modulation Rate RMS Phase Error Phase Acceleration Transmitter Control Time Out RF Power Rise Time RF Power Decay Time Channel Spacing Mode 3 Transmitter Modulation Characteristics Modulation Rate RMS Phase Error Phase Acceleration Transmitter Control Operation Overview T6T VHF Amplifier Rear Panel Supply Switch Drive Assembly Front Panel Controls and Indicators Scroll/Select Switch and LCD Ready Indicator Transmit Indicator Alarm Indicator Standby Indicator Reference Connector Microphone/Diagnostics Connector Rear Panel Supply Switch Setting Up and Operation Normal Operation Using the Scroll/Select Switch Screen Protocol Menu System Menu Lock Screen Control Screen Notes for Setting Up the Transmitter Front Panel Display for 25 kHz and 8.33 kHz Channel Spacing Line Level Setting Offset Carrier Operation Changing the Transmitters Operating Frequency To Store and Recall Frequency Channels To Store a Channel Frequency:

To Recall a Stored Frequency Channel:

To Initiate a BIT Test Standby Mode To Enter Standby Mode To Exit Standby Mode Settings AM-Voice Settings Procedure AM-Voice Mode Settings Screen Page 12 27 27 27 27 27 27 27 27 27 27 28 28 28 28 28 28 28 28 28 29 30 31 32 33 34 34 34 34 34 35 35 35 36 37 37 37 38 38 40 40 41 41 42 42 43 44 44 44 45 46 46 46 47 49 49 Table of Contents (continued) Page AM-MSK Mode Settings Procedure AM-MSK Mode Settings Screen Mode 2 Settings Screen Mode 3 Settings Screen Polarities Screen AM-Voice and AM-MSK AM-Voice and AM-MSK Polarity Settings Mode 2 and Mode 3 Polarity Settings AM-Voice and AM-MSK BIT Screen Mode 2 and Mode 3 BIT Screen Software Configuration Screens Band Edges BIT Status Warning Screens Installation Warnings and Cautions Introduction Fuses and Connectors Installing the Transmitter Initial Inspection of the Transmitter Fitting the Correct ac Input Fuses Fitting the Drive Assembly and Amplifiers into an Equipment Cabinet Connecting the Amplifiers to the Drive Assembly Fitting and Connecting the Combiner Fitting Connecting Connecting the Antenna Connecting the Chassis Stud Connecting the DC Input Supply Connecting the AC Input Supply Configuring the Transmitter for Operational Use Front Panel Connectors Microphone/Diagnostics Connector Reference Connector Rear Panel Connectors MARC Connector MARC Audio Connector MARC Data Connector T1/E1 Connector HDLC Connector External Speaker Facilities Connector 51 51 52 52 53 53 56 57 59 60 61 62 67 68 69 70 71 71 71 72 73 74 74 75 75 77 77 78 79 86 86 86 87 88 89 91 92 93 94 95 Page 13 Page 97 98 98 98 99 99 100 100 100 101 102 103 104 105 105 105 106 106 106 108 109 110 112 114 115 116 116 116 118 120 121 121 123 124 126 127 127 127 128 128 128 128 129 130 130 Table of Contents (continued) Maintenance Introduction Configuration Hardware Configuration Software Configuration Replacement Modules Scheduled Maintenance Cleaning and Checking Security of Connectors Setting the Transmitter Internal Reference Frequency Setting a 5-Offset Carrier Frequency To Initiate a BIT Test AC and DC Change-over Check Unscheduled Maintenance Introduction Molex KK Connectors Tools, Materials and Test Equipment Required T6T VHF Amplifier Procedures Top and Bottom Covers Removing and Refitting the Interface Module Removing and Refitting the PSU Regulation Module Removing and Refitting the Power Supply Modules Removing and Refitting the Combiner BIT Module Removing and Refitting the PA Modules Removing and Refitting the Front Panel PCB Removing and Refitting the Cooling Fans T6T VHF Drive Assembly Procedures Removing the Top Cover Removing and Refitting the Processor Module Removing and Refitting the PSU Regulation Module Removing and Refitting the Drive Module Removing the Bottom Cover Removing and Refitting the PA Control Module Removing and Refitting the Power Supply Removing and Refitting the Front Panel PCB Virtual Front Panel (VFP) Installing the VFP Software VFP Features The Menu Bar Settings Window Channels Window BIT Window Status Information Window To Change the Drive Assembly Profile or Save a Profile To Initiate a BIT Test To Calibrate the Transmitter Page 14 Overview Purpose The T6T 300 watt VHF transmitter is intended for use in fixed ground environments such as airports and en-route centres. The transmitter operates in voice and ICAO defined data modes at frequencies between 118 and 136.975 MHz. Dependent on the software loaded into the radio, the following operating modes can be selected:

AM-Voice. All transmitters have this mode AM-MSK (optional) Mode 2 (optional) Mode 3 (optional). The transmitter, see Fig 1 and Fig 2, consists of a drive assembly, three 100 watt amplifiers and a combiner. The transmitter is configured as shown in Fig 3. Should any one of the amplifiers fail, the transmitter continues to operate at reduced (200 watt) power. T6T VHF Amplifier T6T VHF Amplifier T6T VHF Amplifier T6T VHF Drive Assembly Fig 1 T6T 300 Watt VHF Transmitter T6T 300 Watt VHF Transmitter Page 16 Overview Fig 2 T6T VHF Combiner 100 W Amplifier Drive Assembly 100 W Amplifier Combiner 100 W Amplifier Fig 3 300 Watt Transmitter Arrangement T6T 300 Watt VHF Transmitter Page 17 Overview Models and Part Numbers Table 1 identifies a T6T 300 watt VHF transmitter. Fig 4 shows the identification labels attached to each component. Each label identifies the model, part number, serial number and modification level. Table 1 Model Identification Description Part Number Frequency Range T6T 300 watt standard frequency coverage, high stability, VHF transmitter B63300HS 118 to 136.975 MHz Channel Spacing

(AM-Voice) Special Applications 25 kHz or 8.33 kHz Supports 5-offset carrier operation PAE PAE PAE Model:

Part No:

S / No:

Mod Record:

T6T VHF Drive Assembly 24-06633001/3 2L0001 X 6 7 8 9 10 11 12 13 Model:

Part No:

S / No:

Mod Record:

T6T VHF Amplifier 24-31633001/2 2L0001 X 6 7 8 9 10 11 12 13 Model:

Part No:

S / No:

Mod Record:

T6T VHF Combiner 24-33633001/2 2L0001 1 2 3 4 5 6 7 8 9 10 Park Air Systems Ltd England Park Air Systems Ltd England Park Air Systems Ltd England Drive Assembly Identification Label Amplifier Identification Label Combiner Identification Label Fig 4 Identification Label Examples Mechanical Installation The transmitter, as shown in Fig 1, fits into an industrial standard 19 inch (483 mm) equipment cabinet and occupies, in total, 14U of cabinet space. Additionally, the combiner must be mounted at the back of the equipment cabinet directly behind the amplifiers cooling fans. A bracket provided (shown fitted in Fig 2) is used to mount the combiner on a cabinet upright. T6T 300 Watt VHF Transmitter Page 18 Overview Operating Parameters The transmitters operating parameters are set using the drive assemblys multi-purpose Scroll/Select switch, or remotely from suitable control equipment. Additionally, the Park Air Virtual Front Panel (VFP) software can be used to set up the transmitter. Frequency Selection The transmitter is a single frequency synthesised radio that can operate with 25 kHz and 8.33 kHz channel spacing. The radio recognizes frequencies entered in ICAO format and automatically adjusts to the correct channel spacing. For multichannel operation up to 100 preset frequency channels can be stored in the radio for immediate recall; any combination of 8.33 kHz and 25 kHz channel spacing can be stored. Valid operating frequencies can be selected from the radios front panel or a compatible remote control equipment. Virtual Front Panel The VFP software supplied on CD with the radio 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 typical VFP presentation is shown in Fig 5. Using the VFP has several advantages over setting a radio from the front panel; these are:

A profile of the operational settings and channel information can be created, stored on disk, and then recalled to download into other radios A printout of the radios profile can be made from the VFP The front panel controls can be locked. Front Panel Lock is available only when using the VFP. Fig 5 Typical VFP Presentation T6T 300 Watt VHF Transmitter Page 19 Overview Intentionally Blank Specification General Specification The general specification applies to the transmitter irrespective of the selected operating mode. Variants Only one variant of the T6T 300 watt transmitter is available as detailed in Table 2. Table 2 300 Watt T6T Transmitter Description Part Number Frequency Range Special Applications 300 watt, standard frequency coverage, high stability, VHF transmitter B63300HS 118 to 136.975 MHz Supports 5-offset carrier operation Number of Channels The transmitter has a multichannel capability. 100 channels can be stored and recalled. Frequency Accuracy The frequency accuracy is better than 0.3 ppm. 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 230 Vac 10%. The power consumption figures are given in Table 3. 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 3. Table 3 Power Consumption Requirement Normal Operation ac dc Maximum Typical 3000 VA 2100 VA Not Transmitting 350 VA 75 A 60 A 3.5 A T6T 300 Watt VHF Transmitter Page 22 Specification Dimensions and Weight The transmitter consists of one drive assembly, three amplifiers and a combiner. Transmitter The dimensions and weights quoted below are for a complete transmitter (that is a drive assembly plus three amplifiers):

Width Height Depth Weight 483 mm (19 inches). 622.3 mm (24.5 inches). The height occupies 14U of equipment cabinet space. 430 mm (16.9 inches) measured from front panel to rear panel. 465 mm (18.3 inches) measured from front panel to rear RF connectors. 79 kg (174 pounds). Combiner The dimensions of the combiner, including connectors, are:

Width Height Depth Weight Environmental Temperature range Humidity Altitude 205 mm (8 inches). 180 mm (7 inches). 85 mm (3.4 inches). 1 kg (2.2 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. transmitter operates feet. The Additionally it is capable of storage at altitudes up to 50,000 feet without damage. to specification up to 15,000 Shock and vibration The transmitter complies with shock and vibration protection MIL-STD-810E, method 516.4, procedure VI - Bench Handling. Ventilation The transmitter is cooled by six integral fans that normally run 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 transmitter power supply units also use internal fans. Warm up time The transmitter is fully operational within 20 seconds but can take up to 10 minutes to achieve frequency accuracy for offset carrier. T6T 300 Watt VHF Transmitter Page 23 Specification 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. ETSI test methods specified in EN 300 676 are used where applicable. Transmitter RF Characteristics Output Impedance 50 ohm via an N-type connector. RF Power Output The RF carrier output power is adjustable in 6 W steps from 30 W to 300 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 Amplifier failure Rise time Duty Cycle Both modes Channel Spacing AM-Voice mode Variations in power remain within -0.5 to +1 dB over the operational frequency range. Variations in power remain within 1 dB for supply voltages between 27 Vdc and 32 Vdc. For voltages less than 27 Vdc the power progressively reduces by up to 3 dB. When the minimum dc voltage level is reached, the transmitter dekeys. 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. If one of the three amplifiers fails, the transmitter continues to operate at 66% of the original set power. The power rise time from a keying contact to 90% of full power is less than 50 ms. 100% continuous operation. The transmitter is capable of both 25 kHz channel spacing and 8.33 kHz channel spacing. AM-MSK mode 25 kHz. Offset Carrier AM-Voice mode The transmitter is capable of offsetting the carrier frequency to provide 2, 3, 4 and 5-offset carrier. AM-MSK mode Offset carrier is not available. Harmonic Outputs All harmonic outputs are less than -80 dBc. T6T 300 Watt VHF Transmitter Page 24 Specification Spurious Outputs Both modes Intermodulation Both modes The spurious outputs are less than -46 dBm for modulation depths up to 90%, measured more 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 Mode AM-Voice AM-MSK Modulation Depth Both modes Hum and Noise Both modes 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 modulation can be set to a maximum of 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. Under extreme conditions, when the loop error protection circuit is active, the distortion is maintained at less than 10%. T6T 300 Watt VHF Transmitter Page 25 Specification Residual FM Both modes VOGAD AM-Voice mode 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 with the threshold level set at 10 dB below the average speech line level setting. Within the VOGAD range the modulation depth remains at the set level 10%. It has an attack time of less than 20 ms and a decay time of greater than 2 seconds, both measured with a 10 dB step to 15 dB into VOGAD. AM-MSK mode The VOGAD is disabled. Mute AM-Voice mode The mute level is set at 15 dB below the average speech line level setting. The mute can be disabled. AM-MSK mode The mute is disabled. Differential Group Delay AM-MSK mode Transmitter Control There is less than 60 s differential group delay for signals in the range 1200 to 2400 Hz. Audio Inputs Audio can be connected to the transmitter via the front panel microphone connector or via the 600 ohm balanced line inputs. Line level setting from -30 to +10 dBm. PTT Time Out The time out period is adjustable from 2 to 510 seconds in 2 second steps or it can be disabled. T6T 300 Watt VHF Transmitter Page 26 Specification Mode 2 Mode 2 parameters are identical to AM-Voice mode with the following exceptions. RF Power Rise Time 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. RF Power Decay Time The output power decays by more than 20 dB within 2.5 symbols of the middle of the final symbol. Channel Spacing 25 kHz channel spacing only. Transmitter Modulation Characteristics 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. Modulation Rate The symbol rate is 10,500 symbols/second (0.005%), resulting in a nominal bit rate of 31,500 bits/s. RMS Phase Error The RMS phase error is less than 3. The error vector magnitude is less than 6%. Phase Acceleration 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. Transmitter Control All control information and data for transmission is transferred via the HDLC connector. Control information to an associated receiver is passed via the T1/E1 connector. Data from the receiver is also passed back via the T1/E1 connector and then transferred to the Mode 2 computer via the HDLC connector. This is illustrated in the Installation topic of this CD. Time Out The transmitter automatically dekeys if a transmission exceeds 10 seconds. No fault is flagged and the transmitter keys again for the next transmission. T6T 300 Watt VHF Transmitter Page 27 Specification Mode 3 Mode 3 parameters are identical to AM-Voice mode with the following exceptions. RF Power Rise Time 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. RF Power Decay Time The output power decays by more than 20 dB within 2.5 symbols of the middle of the final symbol. Channel Spacing 25 kHz channel spacing only. Transmitter Modulation Characteristics 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. Modulation Rate The symbol rate is 10,500 symbols/second (0.005%), resulting in a nominal bit rate of 31,500 bits/s. RMS Phase Error The RMS phase error is less than 3. The error vector magnitude is less than 6%. Phase Acceleration 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. Transmitter Control All control information and data for transmission is transferred via the T1/E1 connector. This is illustrated in the Installation topic of this CD. T6T 300 Watt VHF Transmitter Page 28 Specification Operation Overview This topic describes the transmitters controls and indicators and details how to adjust the operational settings. The transmitter comprises a drive assembly, three amplifiers and a combiner. All operational settings are made at the drive assemblys front panel. T6T 300 Watt VHF Transmitter Page 30 Operation T6T VHF Amplifier There are no operating controls fitted to the amplifier. All operational settings are made at the drive assembly. The amplifier has three front panel indicators as detailed in Fig 6 and a rear panel Supply switch. Should an amplifier fail, shown by the Alarm indicator being lit, the transmitter continues to operate at reduced power (200 watts). Ready. A green indicator that lights when the amplifier is ready for use and no BIT faults have been detected. Alarm. A red indicator that lights when a BIT fault has been detected. Transmit. An amber indicator that lights when the transmit circuit is keyed and the amplifier is producing output power. Fig 6 T6T VHF Amplifier Front Panel Indicators T6T 300 Watt VHF Transmitter Page 31 Operation Rear Panel Supply Switch The rear panel Supply switch (Fig 7) is a 2-way rocker switch used to select between power on, and standby. WARNING Dangerous Voltage When the Supply switch is set to the Standby position, dangerous voltage is still present in the internal power supply circuitry. To ensure safe working, the amplifier must be isolated from the ac and dc input supplies.

= On

= Standby Fig 7 Rear Panel Supply Switch T6T 300 Watt VHF Transmitter Page 32 Operation Drive Assembly The transmitters operational settings are made from the drive assemblys front panel (Fig 8). The following pages describe the controls and detail how to set up the transmitter to suit the operational requirement. No attempt to set up the transmitter must be made until all procedures detailed in the Installation topic have been completed. Fig 8 T6T Drive Assembly T6T 300 Watt VHF Transmitter Page 33 Operation Front Panel Controls and Indicators The drive assembly front panel controls and indicators are shown in Fig 9. 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 Fig 9 Front Panel Controls and Indicators Scroll/Select Switch and LCD The Scroll/Select switch is used in conjunction with the Liquid Crystal Display (LCD) to select most of the transmitter's operational settings. During normal operation, the LCD shows the operating frequency, the channel number (if the channel store facility is used), the offset carrier (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:

The transmitter RF output power has reduced from its setting by more than 1 dB but not more than 3 dB 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 300 Watt VHF Transmitter Page 34 Operation 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 46. 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 topic. 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 4. A microphone is fitted to this connector to enable the transmitter to be operated in AM local mode. The connections are detailed in Table 4. A PC can also be connected to allow the VFP to be displayed. Using the VFP is detailed in the Maintenance topic. The PC connections at the transmitter are shown in Table 5. Viewed from front Table 4 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 300 Watt VHF Transmitter Page 35 Operation Table 5 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 Supply Switch The rear panel Supply switch (Fig 10) is a 2-way rocker switch used to select between power on, and standby. WARNING Dangerous Voltage When the Supply switch is set to the Standby position, dangerous voltage is still present in the internal power supply circuitry. To ensure safe working, the drive assembly must be isolated from the ac and dc input supplies.

= On

= Standby Supply Switch Fig 10 Drive Assembly Supply Switch T6T 300 Watt VHF Transmitter Page 36 Operation Setting Up and Operation Setting up the transmitter involves using the front panel Scroll/Select switch to specify the operating parameters. Operating parameters can also be set using the Virtual Front Panel (VFP), through a Multi-Access Remote Control (MARC) system, or from an associated T6 controller. VFP operation is described on this CD under Maintenance; MARC and T6 controller functionality is described in separate documentation. Table 12 on page 63 details the functions and parameters that can be set from all sources. No attempt to set up the transmitter should be made until the installation procedures, given in the Installation topic, are completed. 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 offset carrier (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 topic as the Switch) is used to leave the Main screen and display the Control screen (see page 40). 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 300 Watt VHF Transmitter Page 37 Operation 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 300 Watt VHF Transmitter Page 38 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 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 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 LCDs 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 49) AM-MSK Mode Settings

(see page 51) Menu System Digital Modes

(see page 52) T6T 300 Watt VHF Transmitter Page 39 Operation Menu Lock Screen A security facility available only from the VFP allows the drive assembly 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 transmitter operating frequency. F r e q u e n c y Store or recall preset channel frequencies. C h a n n e l Select operating mode and mode settings. S e t E x i t t i n g s

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

T6T 300 Watt VHF Transmitter Page 40 Operation 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 6 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 6 25 kHz and 8.33 kHz Channel Spacing Displays Actual Frequency

(to 4 decimal places) Channel Spacing Displayed Frequency at Drive Assembly'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 T6T 300 Watt VHF Transmitter Page 41 Operation Line Level Setting 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 preset at 10 dB and 15 dB respectively below the line level setting. Table 7 shows the relationship between the input line level, VOGAD threshold and mute threshold. Table 7 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 Offset Carrier Operation This transmitter can be set to operate using a 2, 3, 4 or 5-offset carrier system as follows:

With 2-offset carrier working, the carriers are spaced at 5 kHz With 3-offset carrier working, the carriers are spaced at zero and 7.3 kHz With 4-offset carrier working, the carriers are spaced at 2.5 kHz and 7.5 kHz With 5-offset carrier working, the carriers are spaced at zero, 4 kHz and 8 kHz. [5-offset carrier is available only on HS transmitter variants.]

If using a 2, 3 or 4-offset carrier system, the appropriate offset is selected from the AM-Voice mode settings screen. After selection, no further action is required. If using a 5-offset carrier system, the appropriate offset (-4 kHz, +4 kHz, -8 kHz or +8 kHz) is selected from the AM-Voice mode settings screen. After selection, the procedure titled Setting a 5-Offset Carrier Frequency must be completed; this procedure is found in the Maintenance topic. T6T 300 Watt VHF Transmitter Page 42 Operation 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 the use of 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) the Control screen, select From 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 (see page 61) can be selected. T6T 300 Watt VHF Transmitter Page 43 Operation To Store and Recall Frequency Channels Up to 100 frequency channels can be stored in the transmitter. 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. To Recall a Stored Frequency Channel:

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 number/frequency is 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:

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 i t Channel Screen - Example 1 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 F r e q 1 1 8 . 0 0 0 M H z 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 n 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 Example 3) is displayed. If a frequency not valid for the mode of operation

(see Example 4) is displayed. is entered, a message T6T 300 Watt VHF Transmitter Page 44 Operation To Initiate a BIT Test Use the following procedure to initiate an interruptive BIT test from the drive assembly 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 57). 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 300 Watt VHF Transmitter Page 45 Operation

(4) On completion, and if the interruptive test was initiated from the front panel, one of the following screens will be shown. T e s t S t a t u s P A S S T e s t S t a t u s F A I L O K O K

(5) 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 LCD 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 300 Watt VHF Transmitter Page 46 Operation Settings Operational settings for the transmitter are configured at the front panel, through the VFP, or 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 Reference frequency Backlight. 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 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 for the mode specific Settings menu. Select for 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

Select for band edge settings screen. Align the transmitter reference frequency (Note 1). Adjust the LCDs backlight time out (Note 2). B a c k E x i t Notes:

(1) Setting the transmitter reference frequency is a maintenance operation. The current value should not be reset unless the correct test equipment is connected. See the Maintenance topic.

(2) The LCD 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 8 on the following page. Click on any required parameter by page number for further references. T6T 300 Watt VHF Transmitter Page 47 Operation Table 8 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 Further Reference page 40 page 46 page 46 page 47 page 53 118.000 to 136.975 MHz 118.000 and 136.975 MHz page 61 15 to 120 s, On or Off 30 to 300 W (6 W steps) 30 s 300 W

-30 to +10 dBm

-13 dBm On or Off On (key) or Off (de-key) 2 to 510 s or Off 5 to 95%

On or Off On or Off On or Off On or Off Off Off 180 s 85%

On On On Off 0, 2.5, 4, 5, 7.3, 7.5 or 8 kHz 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 page 47 page 49 and page 51 page 49 and page 51 page 49 and page 51 page 49 and page 51 page 49 and page 51 page 49 and page 51 page 49 page 49 page 49 page 51 page 50 page 50 page 50 page 50 and page 51 page 50 and page 51 page 50 and page 51 page 50 and page 51 T6T 300 Watt VHF Transmitter Page 48 Operation AM-Voice Settings Procedure During this procedure, the following parameters, applicable to AM-Voice operation, can be set:

RF power output Audio line input level Inhibit (on or off) PTT on (key) or off (de-key) Transmitter time out Modulation depth Mute (on or off) VOGAD (on or off) Antenna change-over delay (on or off) Offset Step Mic (active or passive) 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). Notes regarding optimum line levels are given on page 42. P o w e r L i n e I n I n h i b i t E x i t Adjustments 3 0 0 W RF power between 30 W and 300 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) or Off (de-key). T X T i m e o u t 1 8 0 s 2 to 510 s or Off. 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 300 Watt VHF Transmitter Page 49 Operation f s e t 0 . 0 k H z See Offset Carrier Operation on page 42. 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 Local-remote or Remote-local. L o c a l P T T R e m o t e P T T E x i t

Enabled or Disabled. Enabled or Disabled. E N E N

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 Settings screen. T6T 300 Watt VHF Transmitter Page 50 Operation AM-MSK Mode Settings Procedure During this procedure, the following parameters, applicable to AM-MSK operation, can be set:

RF power output Audio line input level Inhibit (on or off) PTT on (key) or off (de-key) Transmitter time out Modulation depth Antenna change-over delay (on or off) Key priority (local or remote) Enable or disable local PTT Enable or disable remote PTT Enable or disable remote phantom PTT. AM-MSK Mode Settings Screen 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). Notes regarding optimum line levels are given on page 42. Adjustments P o w e r 3 0 0 W RF power between 30 W and 300 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) or Off (de-key). T X T i m e o u t 1 8 0 s 2 to 510 s or Off. 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 Return to Settings screen.

T6T 300 Watt VHF Transmitter Page 51 Operation 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 300 Watt VHF Transmitter Page 52 Operation Polarities Screen AM-Voice and AM-MSK A number of remote indication and control signals can be hardwire connected to the transmitter. These signals, which can have their polarities set to standard (STD) or inverted (INV), are listed in Table 9. The Polarities screen is accessed from the Settings screen. AM-Voice and AM-MSK Polarity Settings Each of ten polarity settings applicable to AM-Voice and AM-MSK can be set to the default STD

(standard) or INV (inverted) setting. The signal connections are shown in Table 9 along with the conditions when STD or INV is selected. The settings for the PTT Reference voltage are also given. 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

S t a r t I n S T D B I T P T T P T T E x i t R e f I n P h a n P T T I n P T T O u t P T T O u t F a s t E x i t

+ 1 4 V S T D

S T D S T D S T D

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 300 Watt VHF Transmitter Page 53 Operation Table 9 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

(Phan 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

(Ext VSWR In) Antenna Change-over

(Ant C/O Out) Facilities, pin 4 TTL input. 0 V active. TTL input. 5 V active. Facilities, pin 5

(Common, pin 6) Solid state relay. +60 to -60 V, 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 -60 V, 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. Continued ... T6T 300 Watt VHF Transmitter Page 54 Operation Table 9 AM-Voice and AM-MSK Polarity Settings (Continued) Signal Connector Polarity set to STD Polarity set to INV Fast PTT Output

(antenna change-over) 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. Maximum input level 60 V with respect to PTT reference. Input will draw no more than 6 mA, and requires at least 1 mA to operate. PTT Ref can be set to +14 V, 0 V or -14 V. Maximum input level 60 V with respect to PTT reference. Input will draw no more than 6 mA, and requires at least 1 mA to operate. When the input PTT signal and the PTT reference differ by more than 10 V the radio keys. When the input PTT signal and the PTT reference are within 1 V, the radio dekeys. Other conditions are indeterminable. When the input PTT signal and the PTT reference differ by more than 10 V the radio dekeys. When the input PTT signal and the PTT reference are within 1 V, the radio keys. Other conditions are indeterminable. T6T 300 Watt VHF Transmitter Page 55 Operation 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) or INV (inverted) setting. The signal connections are detailed in Table 10 along with the conditions when STD or INV is selected. B a c k E x i t

Table 10 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 300 Watt VHF Transmitter Page 56 Operation 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 0 0 0 0 0 : 0 0 h r s A C S u p p l y E x i t D C S u p p l y S u p p l y O N

O N 2 8 V S y n t h L o c k P A S S E x i t

Select to initiate BIT test. Shows elapsed time 0:00 to 99999:59 (Hrs:Min). Shows state of ac supply (On or Off). Shows state of dc supply (On or Off). dc supply 0 to 40 V, <21.6 V Alert, <19 V Alarm. Pass or Fail (Out-of-Lock). P A P A T e m p 5 0 d e g C C o o l i n g B a s e b a n d E x i t P A S S P A S S

PA temperature -20C to +150C. Pass or Fail. 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 P A S S Pass, Fail or Not Tested. Pass, Fail or Not Tested. 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 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.

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 Pass or Fail. Pass, Fail or Not Tested. Pass or Fail.

T6T 300 Watt VHF Transmitter Page 57 Operation 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 P A S S P A S S Pass or Fail. Pass or Fail. Pass or Fail.

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

Pass or Fail. Pass or Fail. Pass or Fail. U n k e y e d P w r P A S S Pass or Fail. Pass or Fail. Active or Inactive. P A S S A C T I V E

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

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 T6T 300 Watt VHF Transmitter Page 58 Operation Mode 2 and Mode 3 BIT Screen The Mode 2 and Mode 3 BIT screen is accessed from the Control screen. E T I 0 0 0 0 0 : 0 0 h r s A C D C S u p p l S u p p l y y E x i t O N O N

Shows elapsed time 0:00 to 99999:59 (Hrs:Min). 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 S y n t h L o c k P A S S P A T e m p 5 0 d e g C E x i t

Shows value of dc supply. Synth lock (Pass or Fail). Indicates the PA temperature. 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. 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 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 P A S S P A S S Pass or Fail. Pass or Fail. Pass or Fail.

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

b r a t i o n P A S S Pass or Fail. Pass or Fail. Active or Inactive. P A S S A C T I V E

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

T6T 300 Watt VHF Transmitter Page 59 Operation Software Configuration Screens Software configuration screens are as follows:

T 6 V H F 1 0 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

The first screen defines the radio. 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 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 65-xxxxxxxx Current mode represents the software part number and /v v represents its version. running. 65-xxxxxxxx represents number and /v v represents its version. the software part The transmitter has four software fills. Fills 2, 3 and 4 screens are the same format as this example shown for Fill 1. T6T 300 Watt VHF Transmitter Page 60 Operation Band Edges The frequency range of the T6T 300 watt transmitter is 118 to 136.975 MHz. 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 between BE3 and BE4 frequencies. 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 11). E x i t

Table 11 Band Edge Settings B63300HS set so that the full frequency range can be transmitted. 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 118.000 136.975 118.000 136.975 120.000 130.000 120.000 130.000 120.000 125.000 130.000 135.000 T6T 300 Watt VHF Transmitter Page 61 Operation 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 Alert:

S u p p l y 2 1 V There is no RF power reduction. The Alarm indicator is flashing. A L E R T 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 Alert:

The RF output power is reduced between 1 and 3 dB. The Alarm indicator is flashing. A L E R T 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 Alert:

The RF output power is reduced between 1 and 3 dB. The Alarm indicator is flashing A L A R M R F P o w e r R e d u c e d V S W R F A I L Alarm:

The RF output power is reduced by more than 3 dB. The Alarm indicator is lit. A L A R M 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:

The RF output power is shut down. The Alarm indicator is lit. A L A R M 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:

The RF output power is shut down. The Alarm indicator is lit. T6T 300 Watt VHF Transmitter Page 62 Operation Table 12 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 300 W

-13 dBm Off Off 180 s 85%

On On AM-Voice - On AM-MSK - Off 0 (No offset) 25 kHz Continued ... T6T 300 Watt VHF Transmitter Page 63 Operation Table 12 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 300 Watt VHF Transmitter Page 64 Operation Table 12 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 change-

over output polarity

(AM modes only) Set antenna change-over 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 Set band edges Reference Frequency Adjust transmitters reference frequency LCD Backlight Adjust LCD backlight BIT Initiate BIT interruptive test

+14 V STD STD STD STD STD STD (active low) STD (active low) 118.000 and 136.975 MHz

30 s

Continued ... T6T 300 Watt VHF Transmitter Page 65 Operation Table 12 Functions and Parameters (Continued) Function Front Panel VFP MARC T6 Controller T1/E1 HDLC Default Setting 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

Off Off Off Off T6T 300 Watt VHF Transmitter Page 66 Operation Installation Warnings and Cautions WARNING Dangerous Voltage The instructions given in this topic involve connecting dangerous voltage to the transmitter and should be carried out only by suitably qualified personnel. WARNING Dangerous Voltage The equipment is permanently connected to the mains supply when the mains connectors are attached. Switching the rear panel Supply 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 to the IEC connectors fitted to the drive assembly and amplifiers, 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. The RF field strength from the antenna can be predicted from the equation S=1.4PG/4R2

[Where S = power density; P = power input to antenna; G = antenna gain; R = distance to centre of radiation and 1.4 = multiplication factor for average power based on a modulation index of 90%.]

Based on this formula for a 300 watt transmitter and using a 0 dBi antenna, the predicted safe distance from the centre of radiation would be approximately 1.8 m for a field strength of 10 W/m2

(1 mW/cm2). This meets the requirements of Health Canada Safety Code 6 for RF and microwave exposed workers. For persons not classed as RF and microwave workers and including the general public the limit is 2 W/m2 (0.2 mW/cm2) which increases the minimum safe distance to 4.1 m. Further information on calculating the field strengths and power levels can be found in Health Canada Safety Code 6 'Limits of Human Exposure to Radiofrequency Electromagnetic Fields in the Frequency Range 3 kHz to 300 GHz', and also in FCC document OET Bulletin 65. Caution ESDs The T6T transmitter's circuitry contains Electrostatic Sensitive Devices (ESDs). Personnel must be aware of the precautions necessary to prevent damage to such devices. During installation all precautions necessary to prevent ESD 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 300 Watt VHF Transmitter Page 68 Installation Introduction The procedures necessary to install a transmitter are listed in Table 13. Installation is in two parts: Steps 1 to 9 in Table 13 must be completed irrespective of how the transmitter is to be configured; step 10 provides a selection of different configurations. Table 13 Installation Procedures Step Procedure Reference 1 2 3 4 5 6 7 8 9 Read and understand the warnings and cautions given on page 68. Perform an initial inspection of the transmitter and fit the correct ac input fuse. Fit the drive assembly and amplifiers into an equipment cabinet. Connect the amplifiers to the drive assembly. Fitting and connecting the combiner. Connect the antenna. Connect the chassis stud to the cabinet or system earth. Connect the dc input supply (if required). Connect the ac input supply (if required). 10 Configuring the transmitter for operational use. page 71 page 72 page 73 page 74 page 75 page 77 page 77 page 78 page 79 T6T 300 Watt VHF Transmitter Page 69 Installation Fuses and Connectors The following list details the equipment supply fuses and connectors. Some of the connectors (depending on your particular configuration) are required during installation. Table 14 Fuses and Connectors Component Type Park Air Part Number Fuses:

AC input fuses, F3 and F4 for 110-240 V input AC input fuse, F2 for 110-240 V input T6.3AH, 250V T3.15AH, 250V 29L01170108S 29C01100102S DC input fuses, F1 (drive assembly), F1 and F2 (amplifier) 15A size 0 29-01350201 Connectors:

AC supply connectors DC supply connectors Antenna connector MARC connector MARC audio MARC data Facilities connector HDLC connector T1/E1 connector Reference connector IEC XLR 3-pin N-type plug 20-02030102 20-01030106 19-01030301 9-way D-type plug Plug: 20-01090100 Cover: 20-09090101 RJ48 plug RJ48 plug 20K01080100 20K01080100 15-way D-type plug Plug: 20-01150100 Cover: 20-09150101 RJ48 plug RJ48 plug 20K01080100 20K01080100 SMB connector 19C01050300 Microphone/Diagnostics connector 7-pin DIN plug 20-01070101 T6T 300 Watt VHF Transmitter Page 70 Installation Installing the Transmitter Initial Inspection of the Transmitter The transmitter comprises:

One T6T VHF drive assembly Three T6T VHF amplifiers One T6T VHF combiner One phasing harness. 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. Fitting the Correct ac Input Fuses The mains input fuses are an integral part of the rear panel ac connectors. The fuse type must be correct for the local mains supply as detailed in Fig 11. The drive assembly has one fuse, F2 Each amplifier has two fuses, F3 and F4. Earth Line Neutral For a mains input in the range 110 to 240 Vac, fuses F3 and F4 should be rated T6.3AH, 250V. For a mains input in the range 110 to 240 Vac, fuse F2 should be rated T3.15AH, 250V. F3 and F4 (amplifier) FS2 F2 (drive assembly) Spare Fuse Holder for spare fuse (not supplied) Fig 11 ac Input Fuses T6T 300 Watt VHF Transmitter Page 71 Installation Fitting the Drive Assembly and Amplifiers 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 drive assembly and the three associated amplifiers, which occupy 14 U of cabinet space, should be installed in an equipment cabinet in the order shown here. The amplifiers are identical and are designated by the numbers 1, 2 and 3 for connection purposes only. Amplifier 1 (4 U) Amplifier 2 (4 U) Amplifier 3 (4 U) Drive Assembly (2 U) The drive assembly and amplifiers 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 12) 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. Slide fittings (in this case for an amplifier) are shown in Fig 12. When fitted in the cabinet, the units front panels must be secured to the cabinets chassis using four M6 x 16 mm screws and plastic washers. Item Description 1 2 3 4 Amplifier Inner slide M4 wavy washer M4 x 8 mm half-head bolt 1 2 3 4 Item Description 1 2 3 4 Transmitter Inner Slide M4 Wavy Washer M4 x 8 mm Half Head Bolt Fig 12 Slide Fittings T6T 300 Watt VHF Transmitter Page 72 Installation Connecting the Amplifiers to the Drive Assembly Having fitted the drive assembly and amplifiers into a cabinet, the units must be interconnected, as shown in Fig 17, using the supplied phasing harness, part number 17L13000006. The connections that must be made are listed in Table 15. Fig 13 shows the amplifier rear panel connectors CN5 and CN8. Fig 14 shows the drive assembly rear panel and Amplifier Out connectors. Table 15 Amplifier/Drive Assembly Interconnections Drive Assembly Amplifier 1 Amplifier 2 Amplifier 3 CN1 CN4 CN2 CN5 CN3 CN6 CN8 CN5 CN8 CN5 CN8 CN5 DANGER HIGH RF VOLTAGES CONNECT BEFORE USE CN8 CN5 SUPPLY DANGER HIGH RF VOLTAGES CONNECT BEFORE USE RATINGS AC SUPPLY FUSE F3 / F4 48-62Hz POWER 800VA max DC SUPPLY 21.6-32V 28 A 110-240V T4A 250V IEC 110-120V T4A 125V UL FUSE F1 / F2 F15A 32V SEE INSTALLATION INSTRUCTIONS BEFORE CONNECTING SUPPLIES DISCONNECT SUPPLIES WHEN NOT IN USE ANTENNA DANGER HIGH RF VOLTAGES CONNECT ANTENNA BEFORE USE FACILITIES FUSE F3

~ AC SUPPLIES FUSE F4 DC SUPPLIES

FUSE F1 FUSE F2 Fig 13 100 Watt Amplifier Rear Panel Showing CN5 and CN8 AMPLIFIER OUT 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 CN6 CN5 CN4 CN3 CN2 CN1 Fig 14 Drive Assembly Rear Panel Showing Amplifier Out Connectors T6T 300 Watt VHF Transmitter Page 73 Installation Fitting and Connecting the Combiner Fitting The combiner, shown in Fig 15, should be mounted at the back of the cabinet directly behind the amplifiers fans and with the heatsink pointing into the cabinet. Cabinet mounting holes are provided in the combiners bracket to allow fixing to a cabinet upright. Fig 16 shows a plan view of the mounting arrangement. Heatsink Cabinet Mounting Holes Fig 15 Combiner Front of Cabinet Amplifier Fans Heatsink Combiner Airflow Bracket fits to upright at rear of cabinet Fig 16 Combiner Mounting Arrangement Plan View T6T 300 Watt VHF Transmitter Page 74 Installation Connecting A coaxial cable connects each amplifier to the combiners three inputs (marked IN) as shown in Fig 17. These cables are part of the phasing harness, part number 17L13000006. Caution Critical Length Cables The cables used to connect from the amplifiers to the combiner are critical length. Use only the cables supplied by Park Air. Connecting the Antenna The combiners antenna connector is an N-type socket suitable for connecting a 50 ohm antenna. 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. The RF field strength from the antenna can be predicted from the equation S=1.4PG/4R2

[Where S = power density; P = power input to antenna; G = antenna gain; R = distance to centre of radiation and 1.4 = multiplication factor for average power based on a modulation index of 90%.]

Based on this formula for a 300 watt transmitter and using a 0 dBi antenna, the predicted safe distance from the centre of radiation would be approximately 1.8 m for a field strength of 10 W/m2

(1 mW/cm2). This meets the requirements of Health Canada Safety Code 6 for RF and microwave exposed workers. For persons not classed as RF and microwave workers and including the general public the limit is 2 W/m2 (0.2 mW/cm2) which increases the minimum safe distance to 4.1 m. Further information on calculating the field strengths and power levels can be found in Health Canada Safety Code 6 'Limits of Human Exposure to Radiofrequency Electromagnetic Fields in the Frequency Range 3 kHz to 300 GHz', and also in FCC document OET Bulletin 65. T6T 300 Watt VHF Transmitter Page 75 Installation Antenna Combiner 1 2 3 Ant Amplifier 1 Antenna Amplifier 2 Antenna Amplifier 3 Antenna Drive Assembly Phasing Harness

(17L13000006) CN8 CN5 Facilities CN8 CN5 Facilities CN8 CN5 Facilities CN3 CN2 CN1 CN6 CN5 CN4 Fig 17 300 Watt Transmitter Interconnections T6T 300 Watt VHF Transmitter Page 76 Installation Connecting the Chassis Stud WARNING Chassis Earth A chassis stud is fitted to each amplifiers rear panel and to the drive assembly. 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 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. Connecting 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. Two dc input supply connectors (see Fig 18) are used on each amplifier and one on the drive assembly. The recommended minimum rating of the dc supply cables is: 2-core having a cross-sectional area of 1.5 mm2 per core. The supply cables should be fitted with XLR 3-pin connectors (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 18 DC Connectors T6T 300 Watt VHF Transmitter Page 77 Installation Connecting the AC Input Supply WARNING Dangerous Voltage The equipment is permanently connected to the mains supply when the mains connectors are attached. Switching the rear panel Supply 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 to the IEC connectors fitted to the drive assembly and amplifiers, 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. Two ac input connectors are fitted to each amplifier rear panel, and one to the drive unit rear panel. The cables used to connect between the equipment and the 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 300 W transmitter is a Class 1 equipment. The ac supply cables 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 T6T 300 Watt VHF Transmitter Page 78 Installation