Tactical Electronics Corporation SX450 G TRANSCEIVER OPERATING INSTRUCTIONS 13 December 2006 These operating instructions are intended to provide the user with sufficient information to install and operate the unit correctly. The SX450 G is a high-performance synthesized UHF transceiver for use in radio telemetry applications. The transceiver provides a maximum power output of 500mW and is designed to meet European standards EN 300 220, EN300 086 and EN300 389.
DIMENSIONS AND FIXING The SX450 G is intended to fit easily and with minimum space requirements into the user's own equipment housing. Figure 1 SX450 G fixing detail Figure 2 - SX450 GA connectors 2 Figure 3 - SX450 GC connector 1892 1344 - SX450G Transceiver Operator Guide v1.
The four corner tabs of the enclosure can be folded out to provide alternative mounting of the unit, with fixing centres of 93.00 x 47.5mm using four M2 screws. Figure 4 - Alternative mounting dimensions 1892 1344 - SX450G Transceiver Operator Guide v1.
CONNECTIONS The radio antenna connects via an MMCX 50O socket. All other connections to the SX450 GA transceiver are made via a 12-way connector PL1 and an 8-way connector PL2. These are single-in-line plugs for use with the free-issued connectors with flying leads. All other connections to the SX450 GC transceiver are made via a 21-way SIL PCB connector, PL1. SX450 GA SX450 GC NAME PL1-1 PL1-1 0V PL1-2 PL1-2 PL1-3 FUNCTION 0 volts common ground STBY standby input LOW (<+0.
PL1-12 PL1-12 CS5 PL1-13 - channel select input (MSB) not connected RF DET TX RF present flag output - PL2-1 PL1-14 PL2-2 PL1-15 PL2-3 PL1-16 SQO squelch flag output NPN open collector via 470O; ON = no signal, OFF = signal present.
OVERVIEW OF FREQUENCIES AND PROGRAMMING Each radio is built to order to cover a band (the switching bandwidth) of 15 or 20MHz within the range 400 - 490MHz. Available bands are 400-415, 415-430, 430-450, 450470, and 470-490MHz. Each radio is also manufactured to work with a particular channel width of 12.5kHz, 20kHz or 25kHz. These are fixed parameters, and cannot be changed by the user.
CONNECTING THE UNIT TO A PC FOR PROGRAMMING In order to program the unit, the unit and a PC (IBM-compatible personal computer) must communicate via an asynchronous RS232 serial link. The unit also requires a power supply. The adaptor of Figure 3 provides these connections. Figure 5 - Adaptor to connect a PC to an SX450 G The power supply should source between 4.5V and 16V DC at approximately 60mA. 1892 1344 - SX450G Transceiver Operator Guide v1.
CHANNEL SELECTION DURING OPERATION There are three ways to select a channel during operation: v v v In hardware, using six logic lines to select channels 0-64 Using the SXWIN.EXE software and a serial connection from a PC to the unit By sending a short serial data message to the unit from your own equipment. Parallel Channel Selection v PL1 pin 6 must be logic high (>2.0V) or high-impedance (e.g. no connection) to select parallel channel selection. This can be done at any time.
Serial Channel Selection v PL1 pin 6 must be logic low (<0.8V) to select serial channel selection. This can be done at any time. v Channels 0 - 255 are available in this mode When PL1 pin 6 is first taken low (or it is low at power-up), the unit operates on the channel most recently selected in serial mode. This setting is remembered during unit power off. The channel can be changed by sending a serial channel number as an RS232 character on PL1 pin 6. The SXWIN.
RANGE INFORMATION The following table gives an indication of the typical ranges to be expected between a transmitter and receiver that have simple end-fed dipole antennas.
TECHNICAL SPECIFICATION General Frequency range 400-490MHz available. Specify 400-415, 415-430, 430450, 450-470 or 470-490MHz when ordering. Switching bandwidth 15 or 20MHz depending on band ordered. Frequency stability +2.6ppm over operating temperature Channel switching delay 100ms maximum (over 20MHz switching bandwidth) Channel selection 64 channels maximum using 6-bit parallel logic line input. 256 channel maximum sequential, 80 individually programmed using serial data word.
Transmitter RF output power into 50O 500mW (HI) (+0/-1.5dB) 5mW (LO) TX/RX switching time <25ms Modulation input analogue digital 750mV p-p, AC-coupled +3 to +12V square wave DC-coupled Frequency response 9Hz to 3kHz at -3dB (analog input) (optional extended response to 6kHz for 9600 baud GMSK) Frequency deviation 25kHz channel spacing 20kHz channel spacing 12.5kHz channel spacing +3.0kHz nominal (+4.0kHz max) +2.3kHz nominal (+3.0kHz max) +1.5kHz nominal (+2.
Tactical Electronics Corporation 4000 Dow Road, Melbourne, Florida 32934 Tel: 321 253 0845 Fax: 321 253 6466 email: info@tacel.com website: www.tacel.com 1892 1344 - SX450 G Transceiver Operator Guide v1.
