Frequency Programmable 25kHz NBFM VHF Transceiver

Frequency:120 -175 MHz

The narrow band NiM1B transceiver offers a low power, reliable data link in a Radiometrix transceiver standard pin out and footprint. The NiM1B is a frequency programmable, narrowband design, suitable for licensed and unlicensed VHF allocations, FCC part 90 and part 95 (MURS) operations.


  • Conforms to EN 300 220-3 and EN 301 489-3 (10mW version only)
  • Compliant with FCC part 95 (MURS)
  • Standard frequency 154.570MHz or 154.600MHz (re-programmable)
  • Other frequencies from 120MHz to 175MHz
  • Data rates up to 5kbps for standard module
  • Usable range over 1km
  • Fully screened
  • Low power requirements
  • 25kHz Channel spacing
  • Feature-rich interface (true analogue and/or digital baseband)


  • Multi-Use Radio Service (MURS)
  • Industrial telemetry and telecommand
  • High-end security systems
  • Vehicle data up/download
  • ROV/machinery controls

Technical Summary

  • Fully integrated sigma-delta PLL synthesizer based design
  • High stability TCXO reference
  • Data bit rate: 5kbps max.
  • Transmit power: +13dBm (20mW)
  • Image rejection: >70dB
  • Receiver sensitivity: -120dBm (for 12dB SINAD)
  • RSSI output with >50dBm range
  • Supply: 3.3V - 15V @ 30mA transmit, 18mA receive
  • Dimensions: 33 x 23 x 11mm (fully screened)

Evaluation platforms: NBEK + BiM / SMX carrier