Press Release Summary:
Narrowband VHF/UHF CXR receiver has better than -118 dBm usable calling sensitivity and draws 20 mA from 3.1-15 V rail. Matching CXT transmitter is offered in 10 or 100 mW version to meet specific band regulations. Providing remote control switch function without need for external circuitry, modules support data rates of up to 5 kbps and provide 32 frequency channel operation in UK, Australia, and EU frequency bands. Units have range of up to 1 km in operating temperatures from -20 to +55Â°C.
Original Press Release:
Narrowband VHF/UHF Multichannel Transmitter/Receiver Modules
Simplify remote control system design thanks to integrated encoders/decoders
Wireless solutions developer Radiometrix has announced the introduction of the CXT / CXR module family. This transmitter/receiver pair provides a complete remote control switch function in a module format, delivering reliable, long range operation in situations where existing wide band solutions cannot offer adequate range, or where band congestion requires multiple channel operation
Thanks to inclusion of easy to use, single-function controllers/actuators the CXT and CXR modules are highly suited to tasks that just call for a simple on/off control function (such as flood light control, machine override shutdown, etc), without the need for any additional external circuitry (such as a microprocessor or dedicated encoder/decoder IC). This keeps the size, bill of materials cost and software overhead associated with system designs that employ these modules to a minimum.
Supporting data rates of up to 5 kbps, the modules are built on the radio hardware of the company's successful LM series. Like the LM series, they provide 32 frequency channel operation (12.5KHz or 25 kHz channels) in any of the 173.200 MHz - 173.325 MHz (UK), 150.825 MHz - 152.450 MHz (Australia), 433.875 MHz - 434.650 MHz (EU), or 458.525 MHz - 459.1 MHz (UK) frequency bands (plus other custom VHF bands on request), allowing them to meet the RF requirements of many different geographical regions.
The CXR receiver has a better than -118dBm usable calling sensitivity, while drawing only 20 mA from a 3.1 V -15 V rail. The matching CXT transmitter can be offered in 10mW (35 mA from 3.1 V -15 V) or 100mW (95 mA from 4.1 V -15 V) versions, depending on specific band regulations.
The integrated control coder/decoder uses a highly noise-tolerant biphase coded data stream, including generous preamble/framing sequences, CRC error detection to minimise false activations and a 16 bit user programmable address. All operating parameters (channel, address, frequency table setup) can be easily programmed by the user, via a simple serial interface. Put together, these features give the user a reliable remote actuator with an operating range of up to 1km.
The CXT and CXR come in compact shielded housings, measuring 33 mm x 23 mm x 9 mm and 46 mm x 23 mm x 9 mm respectively, with pins for PCB mounting. The modules have an operating temperature range of -20 °C to +55 °C and conform fully with EN 300 220-3 and EN 301 489-3 standards. Class one (to EN300-220-v2.3.1) receiver versions are also available.
Key applications for this transmitter/receiver pair include lighting control, security/fire/lone-worker alarms, 'machine stop' systems and generic industrial quality on/off switching mechanisms.
Founded in 1985, London-based Radiometrix has become a leading global developer of low power VHF and UHF radio modules for licence-exempt and licensed frequency bands. It highly experienced engineering team produce products for a wide variety of applications, with both customized and off-the-shelf solutions available through its global sales and distribution network.
For more information go to www.radiometrix.com
Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, UK.
Tel: +44 (0) 208-909-9595
Fax: +44 (0) 208-909-2233
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