QPX1
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2 Watt Multi-channel VHF Transceiver The QPX1 transceiver module offers a 2 watt RF output VHF radio link, in a robust aluminium extruded casing. This unit is ideally suited to applications where existing lower powered transceivers provide insufficient range. The QPX1 is a multi-channel, narrowband design, suitable for licensed and unlicensed VHF allocations, FCC part 90, part 95 (MURS) operation, and the 2M amateur band. Figure 1: QPX1-173-5-12k5-FCC-EAS Compliant with FCC part 90, part 95 (MURS) High performance double superhet PLL synthesizer Data rates up to 5 kbps for standard module Usable range over 10km Feature-rich interface (RSSI, CD, analogue and digital baseband) Incorporate a 1200baud dumb modem Re-programmable via RS232 interface Applications Amateur radio Multi-Use Radio Service (MURS) Industrial telemetry and telecommand High-end security systems APRS systems Vehicle data up/download ROV/machinery controls Technical Summary Standard operating frequency: 151MHz / 173MHz band FCC allocation (12.5kHz channel) Any +/-2MHz band in 135-175MHz 8 channels controlled by parallel port or via RS232 interface) Transmit power: : 2 W (+33dBm) nominal (500mW and 1 watt versions available) Supply range: 12V (11 – 15V) Current consumption: 600mA transmit, 30mA receive Data bit rate: 5kbps max. (standard module) Receiver sensitivity: -118dBm (for 12 dB SINAD) Size: 123 x 59 x 30mm (in EAS120 case - excluding connectors)

Figure 3: DB15 connector pin arrangement 1. QPX1 does not invert the sense of the data waveform. There is no resulting in no net link inversion between two units. A version with an inversion in the RX data path is also available 2. Carrier detect mutes the AF and DATA outputs. It can be disabled by rotating the level set trimmer fully CW. 3. There are no pullups on the open collector outputs. 4. The sofware incorporates a 1200baud dumb modem, compatible with that implemented in TX2M, RX2M, TR2M and SMX2 radios ( i1200 tones and format ). Radiometrix Ltd QPX1 Data Sheet page 2

5. RS232 input pins (14 and 12 ) tolerate true +/- levels. No buffering is required. 6. This is a 2 watt output product. Good grounding , good quality aerials, properly mounted, and a low impedence power supply are required if full performance is to be reliably obtained. Be aware of the effect that the strong RF fields generated by this device (and it's aerial) can have upon other adjacent circuitry if this is not properly screened, filtered or otherwise protected. Regulators, sensitive analogue circuitry, and microprocessors seem especially interference prone. Two watts of RF at VHF can...

The 'modem' mentioned is a 1200 baud RS232 semi-intelligent unit (Transmit keyed when valid serial data is present, so no separate TX control needed. Coding in the datastream also permits the receiver to ignore noise and only output valid serial data) This is a half duplex unit, so collisions between transmitted and received packets must be dealt with by the user. Radiometrix Ltd QPX1 Data Sheet page 4

Serial data is sent to the unit on the programming input PGM (pin 14) 2400 baud at RS232 level. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control. All commands must be in upper case. To successfully program the unit, 'ENABLE' (pin 4) must be 'high' (active) to enable the unit. Once 'modem' mode has been selected, the unit locks into serial command mode (and the parallel port pins have other functions) until a SETPAR command returns the unit to ordinary parallel operation. Unlike earlier Radiometrix multichannel units, the QPX1 (and USA versions of SMX1) has separate N...

Radiometrix Ltd QPX1 Data Sheet page 6

Data sheet links: http://www. radiometrix. co. uk/dsheets/qpx 1 .pdf http://www. radiometrix. co. uk/dsheets/smx 1 .pdf Radiometrix Ltd QPX1 Data Sheet page 7

Copyright notice This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in wholeor in part must give clear acknowledgement to the copyright owner. Limitation of liability The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the right to make changes or improvements in the design, specification or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the application or use of any product or circuit described herein, nor for any...