VHF Narrow Band FM Transmitter

Frequency:Standard: 151.300MHz, 173.225MHz, 173.250MHz

The TX1 and RX1 form a miniature VHF radio transmitter/receiver pair designed for PCB mounting and suitable for extended range data links at speeds up to 10kbps. Link ranges of 10km+ are achievable with suitable choice of data rate and antennas.
Available for licence-exempt operation in the UK 173MHz bands, the TX1 & RX1 modules combine effective screening with internal filtering to minimise spurious radiation and susceptibility thereby ensuring EMC compliance.


  • CE Certified by independent Notified Body
  • Verified to comply with harmonised radio standard ETSI EN 300 220-3 by accredited Test Laboratory
  • Verified to comply with harmonised EMC standard ETSI EN 301 489-3 by accredited Test Laboratory
  • Frequencies available as standard: 173.225MHz, 173.250MHz
  • Other frequencies from 151.300MHz to 173.250MHz available to order
  • Data rates up to 10 kbps with 25kHz channel spacing
  • Usable range to 10km+
  • Screened construction

Technical Summary


  • 2 stage crystal controlled, NBFM modulated at up to 10 kb/s
  • Operation from 2.2V to 12V @ 9.5mA
  • Built-in regulator for improved stability and supply noise rejection
  • Exceptional power efficiency, typically 35% DC ® RF@ 3V supply
  • +10dBm (10mW) RF output
  • Harmonics typically -70dBc
  • Enable facility


  • Single conversion NBFM superhet
  • Image rejection >50dB
  • Operating from 2.7V to 12V @ 12mA
  • Built-in regulator for improved stability and supply noise rejection
  • 10kbps max, -116dBm sensitivity @ 1ppm BER
  • RSSI output with >80dBm range
  • Enable facility

Evaluation Platform: Universal Evaluation kit or Narrow Band Evaluation Kit


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  • High-end security and fire alarms
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  • Vehicle data up/download