SX500 TRANSCEIVER OPERATING INSTRUCTIONS These operating instructions are intended to provide the user with sufficient information to install and operate the unit correctly. The SX500 UHF transceiver is intended to fulfil numerous OEM narrow band UHF applications by virtue of its highly flexible synthesized design approach, miniature size and cost-effective performance. The transceiver is used for telemetry links and provides an RF output power of 100mW. The unit complies with both FCC Part 90 and Industry Canada type acceptance requirements as well as being approved to the EN 300 220 specification for use throughout Europe and much of the world The module is also approved to the EMC specification ETS 300 683. A label must be applied to the outside of the equipment containing the following details:
FCC FCC ID : EFOSX500 Complies with FCC Parts 90 and 15 Frequency (MHz) Restrictions Equipment Marking 458.5000 458.5125 458.5250 458.5375 458.5500 458.5625 458.5750 458.5875 458.6000 458.6125 458.6250 458.6375 458.6500 458.6625 458.6750 458.6875 458.7000 458.7125 458.7250 458.7375 458.7500 458.7625 458.7750 458.7875 458.8000 458.8125 458.8250 458.8375 458.8500 458.8625 458.8750 458.8875 458.9000 458.9125 458.9250 458.9375 458.9500 Band Edge SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB MPT1361 Only SRD SI 1993/1591-4-GB MPT1361 Only SRD SI 1993/1591-9-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB MPT1361 Only SRD SI 1993/1591-11-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB SRD SI 1993/1591-15-GB Band Edge INSTALLATION NOTES:
Pin spacing on all connectors is 2.54mm (0.1") All dimensions in millimetres Figure 1 SX500 Outline Drawing CONNECTION Connection to the SX500 transceiver is via PL1, PL2 and PL3 which plug directly into the user's own equipment. The location of these connectors is shown in Figure 1 and detailed in the following tables. PL1 PIN NAME FUNCTION 1 2 3 0V 0 volts RF O/P RF output 0V 0 volts REMARKS common ground 50 ohms output common ground Table 2 PL1 Pin Connections PL2 PIN NAME FUNCTION REMARKS 1 2
+VRAW DC Supply Input 5.5 - 15 VDC input 0V 0 volts common ground Table 3 PL2 Pin Connections PL3 PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 NAME FUNCTION REMARKS Transmit Enable
< 0.5V = Transmit ON
(internal 20kS pullup) Data Input Digital:
DC coupled TTL compatible Analog Input Analog :
750 mV p-p nominal DI AI RSSI Received Signal Strength Indication Squelch AF Audio Output DATA O/P Data output RSSI: 0.5 - 2.0 V, 60dB dynamic range
(<33kS output impedance) Open drain to <0.4V with 10kS load. Low = No Signal 250mV p-p nominal
(~1kS output impedance) Note inversion of audio from TX input to RX output Open collector digital output Note inversion of data from TX input to RX output
+VOUT
+ 5 volt supply output VOUT= 50mA maximum current drain 0V 0 volts RS232 I/P serial programming i/p common ground RS232 programming input Note inverted TTL level data can also be used. If not used, leave not connected, or connect to ground. RB1 RB2 RB3 parallel frequency select internal pull-up to +5V, active low Table 3 PL3 Pin Connections FREQUENCY PROGRAMMING An area of the PIC memory is re-programmable and allows up to 24 channels to be set to random frequencies and 232 channels to be set to sequential frequencies. The first 8 of the random frequencies can be accessed in parallel mode using the three programming pins RB1, 2 and 3. To access the rest of the channels, the serial programming mode is required. The channel change can be controlled through this serial input. The Windows based software supplied with the SX500 transceiver allows both a new channel to be selected as well as the re-programming of the internal frequency information. The software can be run on a PC with the serial port connected to PL3 of the SX500 transceiver via a suitable adaptor as shown in Figure 2. If the internal stored data is to be accessed, the read-back function is desired, then PL3 pin 13 of the transceiver must be connected to pin 2 of the PC serial port via a buffer circuit. A 1k pull-up resistor to +5V must also be provided as shown. Software Installation Figure 2 Programming Adaptor The s/w is installed by following the normal procedures for installing windows based software. Insert CD or the first floppy disk and run the setup.exe program. Follow the on-screen instructions and the s/w will be installed into the c:\program files\sx500 directory (WIN98) or c:\programs\sx500 (WIN95) directories. A program icon will be placed in the s/w group designated during the installation routine. Running the Software The s/w is accessed after installing by a single click on the SX500 icon. A screen page as shown in the following figure will be displayed. All functions are accessed through this screen. The fields shown in colour can be accessed and modified. Those field shown in grey are fixed by the hardware of the SX500 and cannot be changed by the user. Data is accessed by moving through the fields using the mouse or the TAB key. Where data can be modified, a short description of the data is shown at the bottom of the screen as an aide-memoir. There are 4 main areas of the screen plus the drop-down menu buttons at the top of the screen. The default settings of the screen give the user access to the common data to be modified through these four areas:
Random Channel Table This gives access to the first 24 channels which can be set to any random frequency. Sequential Channel Table This gives access to the 232 channels which can only Current Settings Unit Program Commands This area sets up the data transfer to and from the be sequential This sets up the program parameters SX500 Top Level Menu File Load Load a pre-stored set of data. A file list is displayed which can be selected and loaded by using the mouse, highlighting and double clicking. Save Save the current set of data A set of directories are displayed. When in the correct directory, over-write the default file name displayed and click or hot <ENTER>. Print Print the current set of data. The currently selected Windows default printer will be used. Exit Exit the program. View Internal EEPROM Contents This displays in a separate window the contents of the units EEPROM. The data displayed is for the functions and channels displayed on the main screen at that time. Data can be hand-modified by moving highlighting the data and over-writing it. THIS SHOULD ONLY BE CARRIED OUT WITH FULL KNOWLEDGE OF THE INTERNAL WORKING OF THE SX500. Note that the type of data in each field is displayed at the bottom of the window. While this window is displayed, no access is available to the main screen. The window must be cleared down by clearing the tick in the View drop-down menu. Unit Settings PIC Code contents of the EEPROM. only displayed when the Readback function has been used to download the Current Settings Data COM port Select the correct serial port for the connection to the SX500, default COM1. Intermediate Frequency The Intermediate Frequency is fixed by the hardware and cannot be accessed Fosc The oscillator frequency is fixed by the hardware and cannot be accessed. Comparison Freq. (Fc) The channel step size is fixed by the hardware at 12.5 kHz. For 25kHz or other channel spacings, set the Table Step size accordingly. Minimum Frequency The minimum frequency is used by the software as a base-
line for all other frequency information. This frequency is determined by the physical build of the unit and how it has been aligned. The s/w will not allow a frequency below this minimum to be selected. This frequency is stored in the non-
volatile EEPROM in the unit. Maximum Frequency Receiver Offset The maximum frequency that the unit can work on is determined by the physical build of the unit and the alignment of the unit. If a frequency outside the alignment band is selected then the operation of the SX500 will no longer be to the stated specification. The maximum switching frequency over which the unit will operate is 5MHz. The software uses this 5MHz limit to calculate the maximum frequency from the minimum set and uses this for the selectable frequencies in the drop-down list displayed when selecting frequencies. This 5 MHZ band can be different for the transmit and receive frequencies. The normal operation of the SX500 is with the transmit and receive frequency the same. If an offset is required, a fixed offset can be made between the frequencies by double-
clicking to bring up a selection of offsets. If a frequency outside the alignment band is selected then the operation of the SX500 will no longer be to the stated specification Max. Channel Number This number will determine how many sequential channels are programmed into the table. Serial/Parallel Serial Channel No. To ensure the correct operation of the unit after programming set this flag accordingly. After programming the unit the serial or parallel mode will be set according to this selection. To change channel select a new channel number by right-
clicking to bring up a list or double-clicking to select the field to modify. Random Channel Table The first 24 channels of the SX500 can store randomly selected channels, which are non-
sequential or separated by a common gap. To change an existing frequency, double-click the particular channel. Either type in a new frequency or select from a displayed list of allowed frequencies. Sequential Channel Table To program these frequencies, ensure that the Max. Channel Number field in the Current Settings is set correctly. Under the Sequential Channel Table area enter the start frequency and the Table Step size to set the frequencies in the table. Unit Programming Commands To access these 4 functions, double-click on the text or highlight and press ENTER. When accessed, the relevant data areas on the other three screen areas are highlighted to show which data is being transferred. Set parallel ch. mode Changes the SX500 from serial channel selection mode to/from parallel. Read from the unit Download the data from the SX500, assuming that the correct interface lead has been made. Program unit SeSend all the data displayed on the screen to the unit. Program serial channel Send the new serial channel number to the unit. Parallel Channel Selection Three inputs RB1, RB2 and RB3 applied to PL3 pins 11, 12 and 13 respectively, select the operating channel as shown in the following table:
Most Significant Bit CHANNEL SELECTION Least Significant Bit CHANNEL PIN 13 LOW LOW LOW LOW HIGH HIGH HIGH HIGH PIN 12 LOW LOW HIGH HIGH LOW LOW HIGH HIGH PIN 11 LOW HIGH LOW HIGH LOW HIGH LOW HIGH The logic levels are: LOW = < 0.8V, HIGH = > 2V or floating 7 6 5 4 3 2 1 0 TECHNICAL SPECIFICATION Frequency Range Switching Bandwidth Channel Spacing Number of RF Channels Frequency Stability Supply Voltage Supply Current Duty Cycle Interface Connections RF Connection Size Weight Temperature (operating) Temperature (storage) Approvals Transceiver (Overall) 400 - 500 MHz (banded) 5MHz 12.5, 20 and 25 kHz 8 255 selectable with an external 3 line select selectable via a serial interface 32 random and 255 sequential 2.5ppm 5.5 - 15 VDC Transmit Receive
<100mA at 7.2 VDC
< 40mA at 7.2 VDC 100% max Refer to Figure 1 Via PCB Pins 59.5 l x 38.5 w x 17.0 h mm
30gms
-25C +55C
-30C +80C ETS 300 220, ETS 300 683, meets FCC & IC RF Output Power 100mW +1, -2 dB adjustable down to 1mW Transmitter Receive to Transmit Switching Time Power-on settling time Modulation Input
<25ms
<60ms Analog : 750 mV p-p nominal Digital:
DC coupled TTL compatible Frequency Response
<10 - 3000 Hz flat (at -3dB) Sensitivity AF Output RSSI Output Squelch Type Squelch Flag Receiver
-115dBm/12dB SINAD at 25kHz channel spacing 250mV p-p into 10kS (muted by Squelch) 0.5 - 2.0V with 60dB range and 33kS o/p impedance Noise operated with hysteresis. Open collector to <0.4V with 10kS load. Low = No Signal Tactical Electronics Corporation 4000 Dow Road Melbourne, Florida 32934 Tel: (321) 253 0845 Fax (321) 253 6466 info@tacel.com 15 February 2000. RF Safety Information:
This device is a radio frequency transmitter and receiver and as such emits radio frequency electromagnetic energy when transmitting. The FCC and international agencies have set forth guidelines regarding human exposure:
USA FCC, Code of Federal Regulations: 47 CFR part 2 subpart J ANSI/IEEE C95.1-1992 and 1995. American National Standards Institute and Institute of Electrical and Electronic Engineers. National Council on Radiation protection and Measurements (NCRP) of the USA, Report 86,1986 Inernational Commission on Non-Ionizing Radiation protection (ICNIRP) 1998 Using FCC guidelines: The antenna gain maybe up to 13 dBd. Based on a 50% transmit time and maintaining a 21 cm distance from all persons.