Narrow band multi channel transmitter 70TX-LS

The UHF transmitter 70TX-LS is a universal multi-channel radio data transmitter for use in demanding applications of data transmission. Unlike other wireless modules from our production the modulation is intended exclusively for digital data. The module is implemented as synthesizer and allows operation in the European ISM band from 433.0625 to 434.7875 MHz to a total of 139 channels at 12.5 kHz raster.

The frequency setting is only possible via an SPI interface. The internal microcontroller calculates from the transmitted command a serial data protocol for the synthesizer that adjusts to the proper frequency. On request, we can program the module with up to 1000 frequencies and any raster. The 70TX-LS transmitter covers in principle the frequency range of 430 to 440 MHz and can therefore be used for the Scandinavian frequency bands starting at 438MHz.

The combination with our receiver modules 70RX-S2 or 70RX-M2 offers a perfect radio system with long range communication at simplex or half-duplex. Together with our remote control unit FSM24 the free-field range is about 1400 m.


  • Narrow band multi channel transmitter
  • Up to 1000 channels
  • 10mW output power
  • Typical range 1400m
  • Super small size
  • Less current consumption
  • Data rate 100 - 4800 Bd
  • Suitable for digital data only
  • No licence required
  • Compliance to RED ( 2014/53/EU ), EN 300220


  • Remote control systems
  • Industrial applications
  • Telemetry systems
  • Alarms
  • Security systems


Communication Simplex
Frequency range 433.0625 - 434.7875 MHz    (12.5 / 25 kHz step)
  optional 430 - 440 MHz
Number of channels 139 channels (Standard ISM); max. 256 channels
Output power 10 mW / 10 dBm at 50 Ω
Modulation FM narrow band    (digital only)
Data input level up to 5 VPP (TTL), depends on supply voltage
Deviation ± 2,4 kHz  (± 50 Hz)
Data rate 100 - 4800 Bd
Temperature range -25°C . . . +75°C (TCXO)
Supply voltage 2.3 - 5.2 V   (max. 2.2 - 5.5 V)
Supply Current 24 mA (± 1 mA)
Dimensions 22.0 x 13.8 x 6.0 mm
Weight 5 g
Material Stainless steel
Antenna connector pin header
Approvals RED (EN 300220)  for  Europe (433,0625 - 434,7875 MHz)

Data sheet 70TX-LS (10mW, multi channel)

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