The NiM2 is a narrow-band transceiver module from Radiometrix that offers a low-power, reliable data link in the company's standard transceiver pin-out and footprint. Its specifications make the product highly-suited to power-frugal applications where existing single frequency wideband UHF modules lack sufficient range. Data rates of up to 10 Kbps, and distances over 500 m can be supported.
The module delivers a transmit power of +10 dBm (10 mW), while its receiver sensitivity is -118 dBm (for 12 dB SINAD). Standard frequencies provided are 434,65 and 434,075 MHz, but custom versions, with frequencies occupying the 433 MHz (EU licence-exempt) band are also available. Channel spacing is 25 kHz.
The transmit section consists of a frequency modulated VCXO feeding a frequency multiplier and two stage amplifier. The receive section is a double conversion FM superhet with IF at 21,4 MHz and 455 kHz. The signal path includes a SAW-based RF filtering that gives image rejection levels of 50 dB or better. The device conforms fully with both ETSI EN 300 220-3 (radio) and EN 301 489-3 (EMC) regulatory standards.
Due to screening and internal filtering, these products minimise spurious radiation and susceptibility. Their small size and low power consumption also meet the needs of battery-powered portable equipment. They can be run off a low-current 2,9 to 15 V supply.
Among the many varied system designs it can be integrated into are EPOS instrumentation, barcode scanners, dataloggers, industrial telemetry/telecommand, in-building environmental monitoring/control, high-end security/fire alarms, DGPS systems, and vehicle data up/download.
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