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Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com
QPX1
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 operation, and the 2M amateur band.
02nd November 2009
Figure 1: QPX1-173-5-12K5-FCC-EAS
Features
! ! ! ! ! ! ! Compliant with FCC part 90 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 MURS units Industrial telemetry and telecommand High-end security systems APRS systems Vehicle data up/download ROV/machinery controls
Technical Summary
! ! ! ! ! ! ! ! ! Standard operating frequency: 154MHz / 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 (excluding connectors)
Radiometrix Ltd
QPX1 Data Sheet
page 1
Figure 2: QPX1 footprint (top view through
8 15 9
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Figure 3: DB15 connector pin arrangement
User interface: Standard mode
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 NOTE: 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 ). 5. RS232 input pins (14 and 12 ) tolerate true +/- levels. No buffering is required.
Radiometrix Ltd QPX1 Data Sheet page 2
Name TXD TXE AF in ENABLE RSSI AF out RXD SQF 0V P3 P2 P1 P0/PGM PGM Vcc
Function DC coupled input for 3V CMOS logic. Rin=47k Transmitter enable. Low = ON, open = off. 100K pullup to (raw Vin -5v) 250mVp-p to 2.5V p-p AC coupled input. Variable gain Overall unit 'on' (high active, high voltage tolerant) DC level between 0.5v and 2.5v. 60dB dynamic range 200mV p-p audio. DC coupled, approx 1v bias. Muted by squelch Open collector output of data slicer suitable for Biphase codes Carrier level squelch. Open collector. ON/low = no signal Ground Parallel frequency select inputs. Inverted logic, 10K pullups to 5v Serial programming/control input (inverted logic level RS232) True RS232 input (inverter to pin 13) 12V DC supply (11-15V). 550mA typ. current drain
9
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 cause an unpleasant and painful burn. Be careful. 7. Caution:. The TXD and P1-P3 inputs are not high voltage tolerant. Low voltage logic, or switches to ground, are required. 8. A simple RS232 voltage tolerant transistor inverter connects pin 14 to PGM 9. Depending on the firmware, some versions use P0-P3 as parallel select. Others use P0 as a programming input only, and P1-P3 as parallel inputs. Refer to tech support for details. 10. Enable pin (4) may be tied to +Vin 11. Overall thermal power dissipation in normal use is around 4 watts, rising to 6-7 watts under aerial fault conditions. 12. This design uses the SMX1 mk2 transceiver RF board as an internal component 13. For visual reference, this unit uses an Evatron-type REAS120 extrusion
User interface: Modem mode
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. Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Name NC TXE NC ENABLE RSSI AF out NC NC 0V (tba) MOD RXD MOD TXD PGM PGM Vcc Function Leave open Open = normal modem operation. Low = constant TX (for test). 10K pullup to 5v Leave open Overall unit 'on' (high active, high voltage tolerant) DC level between 0.5v and 2.5v. 60dB dynamic range 200mV p-p audio. DC coupled, approx 1v bias. Muted by squelch Leave open Leave open Ground Leave open inverted "RS232" data out (to inverting buffer like MAX232) RS232 data input (true). 10K pullups to 5v inverted version of pin 14 Serial programming/control input (true RS232) 12V DC supply (11-15V). 550mA typ. current drain
Radiometrix Ltd
QPX1 Data Sheet
page 3
Serial Programming
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 and R registers for each channel, on transmit and on receive. In other words, the frequency of each channel is individually programmed in every mode. Unless a complex frequency map has been selected, all the R value registers are likely to be programmed with the same value Command GOCHAN a LDTXN a LDRXN a LDTXR a LDRXR a nnnnn nnnnn rrrrr rrrrr Function serial select of channel a (ch0 to 7) set value of N for channel a , for transmit set value of N for channel a , for receive set value of R for channel a , for transmit set value of R for channel a , for receive channel selected by 3 bit parallel input 3 channel selected by most recent 'gochan' operation set R register value used by SINGLE command set value of N for single channel operation. N value NOT stored in e2prom Enable internal modem. Frequency selected by most recent 'gochan' or 'single' process entry clear all buffers disable command mode
SETPAR SETSER RVALUE rrrrr SINGLE nnnnn SETMOD / #
a = a single digit channel number from 0 to 7 nnnnn = a synthesizer N register value, (up to 65535) rrrrr = the synthesizer R register value, (up to 16383)
For Transmit, N tx =
ChannelFrequency 10 kHz R ChannelFrequency - 21.4 For Receive, N rx = 10 kHz R f Xtal 10 Hz = , So R= 400 (usually) R= f channelspacing 25kHz
In 'SINGLE' mode the unit is inoperative after a power down until either another valid SINGLE command is received, or mode is changed by a GOCHAN, SETPAR or SETSER command. Single mode applies a receive frequency offset of 21.4MHz 'Single' mode is intended for frequency agile applications. A pause of at least 50mS must be allowed between command strings (eeprom programming time)
Note:
Radiometrix Ltd
QPX1 Data Sheet
page 4
Condensed specifications
Frequency 154.45625 - 154.47875MHz (12.5kHz steps) - FCC part 90 173.20375 - 173.39625MHz (12.5kHz steps) - FCC part 90 General: any +/-2MHz band in 135-175MHz 1.5kHz 25kHz / 12.5kHz 8 channels (controlled by parallel port or via RS232 interface) 11 - 15V 600mA nominal (800mA max.) transmit 30mA receive <5uA standby ('enable' pin low) -10 to +55 C (Storage -30 to +70 C) in EAS120 case 123 x 59 x 30mm (excluding connectors) < 2nW (-57dBm) 15pin D type SMA US 'part 90' approval EU EN300-220 (dependant on power level) 2W (+33dBm) +/- 1dB (500mW and 1 watt versions available) <50 ms (from TXE transition) FSK (F3D) DC - 5kHz (CMOS compatible, or analogue AF) +/- 3kHz (25kHz) or 1.5kHz (12.5kHz) -37dBm -36dBm data (CMOS/TTL compatible) -118dBm for 12dB SINAD -60dB -84dB -60 dB RSSI, carrier detect, audio, data 28ms 50ms (for 50:50 mark / space)

Frequency stability Channel spacing Number of channels Supply voltage Current
Operating temperature Size Spurious radiations Interface user RF Intended approval
Transmitter Output power TX on switching time Modulation type TX modulation bandwidth Deviation Adjacent channel TX power TX spurii Inputs Receiver Sensitivity image / spurious blocking adjacent channel Outputs Power on to valid audio Power on to stable data out
Notes: 1. The data slicer cannot be depended upon for data waveform frequencies below 250Hz 2. When RX is on and a transmitter keys up, again a 50ms period is required to stabilise data output mark/space. i.e. allow at least 50ms of preamble FCC Part 90.238 Telemetry frequency channels (12.5KHz spacing) CHANNELS CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 154MHz band 154.45625 154.46375 154.47125 154.47875 154.45625 154.46375 154.47125 154.47875 173MHz band 173.20375 173.21000 173.23750 173.28750 173.31250 173.33750 173.36250 173.39625
Radiometrix Ltd
QPX1 Data Sheet
page 5
Ordering Information
Part No.
QPX1-154-5-12k5-FCC-EAS QPX1-173-5-12K5-FCC-EAS QPX1-xxx-5-EAS
Description
US version in extrusion case US version in extrusion case Standard 25kHz channel in extrusion case
Frequency band (MHz)
154MHz 173MHz Where xxx is any VHF frequency with in 135175MHz
Data sheet links: http://www.radiometrix.co.uk/dsheets/qpx1.pdf http://www.radiometrix.co.uk/dsheets/smx1.pdf
Radiometrix Ltd
QPX1 Data Sheet
page 6
Radiometrix Ltd
Hartcran House 231 Kenton Lane Harrow, Middlesex HA3 8RP ENGLAND Tel: +44 (0) 20 8909 9595 Fax: +44 (0) 20 8909 2233 sales@radiometrix.com www.radiometrix.com
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 infringements of patents or other rights of third parties which may result from the use of its products. This data sheet neither states nor implies warranty of any kind, including fitness for any particular application. These radio devices may be subject to radio interference and may not function as intended if interference is present. We do NOT recommend their use for life critical applications. The Intrastat commodity code for all our modules is: 8542 6000.
R&TTE Directive
After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of the R&TTE Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance to the essential requirements specified in Article 3 of the Directive, as appropriate to the particular equipment. Further details are available on The Office of Communications (Ofcom) web site: http://www.ofcom.org.uk/radiocomms/ifi/ Information Requests Ofcom Riverside House 2a Southwark Bridge Road London SE1 9HA Tel: +44 (0)845 456 3000 or 020 7981 3040 Fax: +44 (0)20 7783 4033 information.requests@ofcom.org.uk European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 ero@ero.dk www.ero.dk

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