Narrow band 10mW multi channel transceiver 70TRX-T

The new designed FM-transceiver module 70TRX-T from HM-Funktechnik is an absolut high end module with internal synthesizer and microcontroller to convert the external 8 bit wide channel information into the serial data protocol for the synthesizer chip. No complicate programming is needed. The module offers 139 channels in the european 70cm ISM frequency range from 433.05 to 434.79 MHz and corresponds to EN 300220 demands.

Upon request it is also available for frequencies within the range from 410 to 510MHz and a switching bandwith of 5 MHz max. The dual conversion system is simply a must for high end applications. The module has a remarkable selectivity, which allows its use in applications where several modules must be operated locally and on adjacent radio channels at the same time.

The excellent RF sensitivity of –118dBm by CCITT weighting allows its use for long distance signal transmissions.

The direct audio signal output doesn`t restrict its use for any kind of coding. Any type of recommendable signal can be used, even direct audio signals, e.g. speech.

The combination with another transceiver-module 70TRX-T offers the user a perfect radio system with long distance communication at half-duplex. Together with our remote control unit FSM24 you can reach 1500 m and more at free sight.


  • Narrow band multi channel transceiver
  • Up to 256 channels
  • 10mW output power
  • Typical range 1500m
  • Very small size
  • Less current consumption
  • Data rate DC - 5kHz (up to 9600 Bd)
  • Suitable for analog and digital data
  • No licence required
  • Compliance to R&TTE (99/5/EG), EN 300220
  • also with professional approval EN 300113


  • Remote control systems
  • Industrial applications
  • Telemetry systems
  • Alarms
  • Security systems
Transceiver 70TRX-T
Transceiver 70TRX-T backview


Communication Half-Duplex
Frequency range 433.0625 - 434.7875 MHz (12.5 / 25 kHz raster)
  optional 410 - 510 MHz
Number of channels 139 channels (Standard ISM); max. 256 channels
Output Power 10 mW / 10 dBm at 50 Ω
Modulation FM narrow band (analog and digital)
Data input level 5 VPP (TTL)   
Deviation ± 2.5 kHz  (± 300 Hz)    by sinus with 5 VPP
Receiver mode Double Superhet
Sensitivity at least  -118 dBm  / 12 dB SINAD (CCITT-filter)
Selectivity 15 kHz channel bandwidth
NF-Output 1.0 VPP    inverted
Data rate DC - 5 kHz (up to 9600 Bd)
Temperature range -25°C . . . +75°C
Supply voltage 5 - 11 V    (max. 4.6 - 12 V)
Supply current Receiver-mode:  56 mA (± 3 mA)  [with EN 300113 / 69 mA]
  Transmit-mode:  75 mA (± 4 mA)
Dimensions 51.8 x 31.6 x 15 mm  (with lashes 61.8 x 31.6 x 15 mm)
Weight 29.6 g
Material stainless steel with M3 mounting lashes
Antenna λ/4 - whip antenna (Teflon)     optional SMA-, SMB- or MCX
Outputs Mute, RSSI, Lock Detect
Approvals R&TTE (EN 300220)  for  Europe (433.0625 - 434.7875 MHz)
  optional R&TTE (EN 300113)  for  Europe (433.0625 - 434.7875 MHz)

Data sheets 70TRX-T (multi channel) ----> replaced by 70TRX-T1

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