Radiometrix’ narrow-band FMmodules, the LMT2 and LMR2, offer OEMs a multichannel, power-conservative, reliable data link. This transmitter and receiver pair are highly-suited to low-power applications where existing wideband modules lack the necessary range, or where low-cost multichannel operation is required without causing any compromise to the system's RF functionality.
The products can communicate at distances in excess of 500 m (when using suitable antennas), with the transmitter delivering an output power of +10 dBm (10 mW), and the receiver having a sensitivity of -120 dBm (for 12 dB SINAD). The transmitter/receiver pair can be set to operate at any frequency within the 433 MHz ISM band (though other frequency variants are available, including the UK 458 MHz band). Both of these devices are run from a 3,1-15 V supply, the transmitter consuming a current of 34 mA and its partner needing 20 mA. The maximum data bit rate is 5 Kbps for standard versions (a quasi-DC data recovery circuit improves performance with unbalanced, asynchronous data streams).
The LMT2 and LMR2 are fully re-programmable via their RS232 interfaces, a total of 32 discrete channels being programmed into the unit. These modules can be applied to a spectrum of tasks; including handheld terminals, environmental monitoring equipment, barcode scanners, dataloggers, vehicle data up/download, industrial telemetry and telecommand, as well as high-end security alarm systems.
The LMT2 comes in a 33 x 23 x 9 mm fully-screened package, while its counterpart takes up 45 x 23 x 9 mm. The two units have compatible pin-outs, allowing a common board layout to accommodate either of them. These radios conform with both EN 300 220-3 and EN 301 489-3 EMC standards.
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