Narrow band 500mW transmitter 70TX-E2

The 70TX-E2 is a professional 500mW narrow band FM radio transmitter according to EN 300113 and has been improved in many respects compared to its predecessor 70TX-E. The innovative concept combines the advantages of the DDS with those of the synthesizer in a unique way. The signal digitization offers a resolution of 12 bit. Further signal processing is completely digital. The result is an almost perfect RF signal with excellent transmission characteristics for both analog and digital signals.

The package volume was reduced by 50% compared to the 70TX-E. The 70TX-E2 is now one of the smallest synthesizer UHF transmitter modules with 500 mW transmission power. The module is therefore particularly suitable for portable and mobile applications. At the same time, the power requirement dropped by more than 10% at full transmission power. To optimize power consumption, the integrated SPI interface can be used to reduce transmission power from 500 mW to 1 mW. Other parameters can also be changed during operation via SPI (frequency and start channel). The RF power amplifier is largely immune to mismatch at the antenna due to extensive protective measures.

When changing the operating states (power on and frequency change) usually occurs broadband interferences (called transients), which hinder the simultaneous use of multiple radio links in the near area. With the 70TX-E2, even the adjacent channels are not disturbed under these conditions. Together with the short settling time, the module is therefore predestined for use in TDMA or frequency hopping applications. The two available standby modes reduce the startup time and the amount of the required components to a minimum.

In combination with our 70RX-M2 or 70RX-S2 receivers, very long range radio systems can be set up for simplex or half-duplex operation. Together with our control module FSM24 the free field range is more than 5000 meters.


  • Narrow band multi channel power transmitter
    with professional licence EN 300113
  • Up to 1000 channels
  • 500mW output power
  • Typical range 5000m
  • Very small size
  • Low current consumption
  • Data rate DC - 5kHz (up to 9600 Bd)
  • Suitable for analog and digital data
  • Compliance to RED ( 2014/53/EU )


  • Remote control systems
  • Data communication
  • Industrial applications
  • Telemetry systems
  • Alarm systems
  • Security systems
Transmitter 70TX-E2 with SMB plug
Transmitter  70TX-E2
Transmitter 70TX-E2 with SMB plug
Transmitter  70TX-E2 back view


Communication Simplex
Frequency range 433.0625 – 434.7875 MHz     ( 12.5 / 25 KHz raster )
Optional frequency range 250 – 550 MHz    raster according to customer wishes
Number of channels 139 at ISM, else up to 256     with SPI programming up to 1000
Output power 350mW at 50 Ω / 5 V    500mW at 50 Ω / 6 V
Modulation FM narrow band
Modulation DC – 5 kHz ( up to 9600Baud )
Deviation Standard: ± 2,4 kHz ( ± 50 Hz ) at sinus 5VPP
Temperature range -40°C  -  +80°C ( with TCXO )
Supply voltage 4.7 - 8.0V     max. 4,5 - 12.0V ( 8-12 V only with low duty cycle )
Supply current < 270mA ( ± 30mA ) at 5V     < 290mA ( ± 30 mA ) at 6V
Startup Time < 25 ms ( Power On )    < 4ms ( Standby 1 ), < 25ms ( Standby 2 )
Dimensions 49.2 x 24.9 x 9.7 mm   with lashes 60.0 x 24.9 x 9.7 mm
Weight 20 g
Material Stainless steel with M3 mounting lashes
Antenna connector SMA    optional SMB or MCX

RED ( EN 300113 )     Europe( 433.0625 – 434.7875 MHz )

FCC planned


Data sheets 70TX-E2 (500mW, multi channel)

zum Seitenanfang Icon