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.
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) 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.
INSTALLATION Pin spacing on all connectors is 2.54mm (0.1") All dimensions in millimetres NOTES: 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.
PL3 PIN NAME 1 FUNCTION REMARKS Transmit Enable < 0.5V = Transmit ON (internal 20kS pullup) 2 DI Data Input Digital: 3 AI Analog Input Analog : 4 RSSI Received Signal Strength Indication RSSI: 0.5 - 2.0 V, 60dB dynamic range (<33kS output impedance) Squelch Open drain to <0.4V with 10kS load.
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.
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.
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.
Maximum Frequency 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.
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. Se nd all the data displayed on the screen to the unit.
TECHNICAL SPECIFICATION Transceiver (Overall) Frequency Range 400 - 500 MHz (banded) Switching Bandwidth 5MHz Channel Spacing 12.5, 20 and 25 kHz Number of RF Channels 8 255 Frequency Stability ±2.5ppm Supply Voltage 5.5 - 15 VDC Supply Current Transmit Receive selectable with an external 3 line select selectable via a serial interface 32 random and 255 sequential <100mA at 7.2 VDC < 40mA at 7.
Transmitter RF Output Power 100mW +1, -2 dB adjustable down to 1mW Receive to Transmit Switching Time <25ms Power-on settling time <60ms Modulation Input Analog : Digital: Frequency Response <10 - 3000 Hz flat (at -3dB) 750 mV p-p nominal DC coupled TTL compatible Receiver Sensitivity -115dBm/12dB SINAD at 25kHz channel spacing AF Output 250mV p-p into 10kS (muted by Squelch) RSSI Output 0.5 - 2.0V with 60dB range and 33kS o/p impedance Squelch Type Noise operated with hysteresis.
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.
