Narrow band multi channel receiver 70RX-SP2

The 70RX-SP2 is a high quality narrow band FM multi channel radio receiver according to EN 300220 and Part 15B with improved blocking behaviour. This significantly increases the immunity to interference from out-of-band interferers. In combination with our transmitter modules, radio systems with a very long range can be set up in simplex or half duplex operation.

The receiver is produced by default for the European ISM band at 433 / 434 MHz. All 139 channels from 433.0625 - 434.7875 MHz are predefined in a 12.5 kHz raster and can be called up without any programming effort. The module is available for most of the worldwide used frequency bands in the 400 MHz range: 406 - 418 MHz, 418 - 428 MHz, 428 - 438 MHz, 438 - 448 MHz, 456 - 466 MHz and 466 - 476 MHz.

The integrated synthesizer can be programmed in two ways. Either via the well-known 8bit parallel port with up to 256 predefined channels or serially via the SPI. Up to 1000 channels in a nearly arbitrary channel spacing are possible. Status parameters such as RSSI and Mute can also be retrieved via the SPI.

The excellent RF sensitivity allows signal transmissions over very long distances. 10mW output power of 70TX-M1 or 70TX-S together with the remote control unit FSM24 is sufficient for a free field range of more than 2000 m. The receiver is also characterized by a very high selectivity, which allows the operation of many devices in the same area.

The direct audio signal output doesn`t restrict its use for any kind of coding. Any type of recommendable signal can be used, even analogue audio signals, e.g. speech. A Butterworth filter at the output eliminates noise- and interfering signals with high efficiency.


  • Narrow band multi channel receiver
  • 1:1 substitute for 70RX-S2 (higher blocking)
  • 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 RED (2014/53/EU), EN 300220
  • FCC and Canada approvals


  • Remote control systems
  • Industrial applications
  • Telemetry systems
  • Alarms
  • Security systems
Receiver 70RX-SP2 with whip antenna
Receiver 70RX-SP2 antenna
Receiver 70RX-SP2 with SMB socket
Receiver 70RX-SP2 socket
Receiver 70RX-SP2 backview
Receiver 70RX-SP2 backview


Communication Simplex
Frequency range 433.0625 - 434.7875 MHz (12.5 / 25 kHz raster)
  optional 406 - 476 MHz
Number of channels 139 channels (Standard ISM); max. 1000 channels
Receiver type Double Superhet
Sensitivity at least  -121 dBm  / 12 dB SINAD (CCITT-Filter)
Selectivity 15 kHz channelbandwidth
NF-Output 0.8 VPP    inverted
Data rate DC - 5 kHz (9600 Bd)
Temperature range -25°C  -  +75°C     optional -40°C  -  +80°C with TCXO
Supply voltage 3.3 - 14 V    (max. 3.1 - 15 V)
Supply current 25 mA (± 2 mA)
Dimensions 49.2 x 24.9 x 9.7 mm  (with lashes 60 x 24.9 x 9.7 mm)
Weight 21 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 RED (EN 300220)  for  Europe (433.0625 - 434.7875 MHz)
  FCC (Part 15)  for USA (420 - 510 MHz)
  CAN  for Canada (420 - 430 / 450 - 470 MHz)

Data sheets 70RX-SP2 (multi channel)

zum Seitenanfang Icon