869/915MHz band Radio modem

869/915MHz band Radio modem

Frequency:Europe: 869.85MHz or 868.30MHz, North America: 914.50MHz

A TDL3F is a single channel, 869 or 915MHz wideband, transparent data link. It has a TDL2A pin out (and firmware), but uses a BiM3 series radio module. TDL3F acts as a transparent serial cable to attached host. DWA3 is an intermediate level OEM radio modem which is in between a raw FM radio module like BiM3A and a sophisticated OEM radio modem like RPM3. It takes care of preamble, synchronisation, bit balancing and error checking along with automatic noise squelching.


  • Conforms to EN 300 220-3 and EN 301 489-3
  • Crystal controlled PLL FM circuitry for both Tx and Rx
  • Low noise synthesiser / VCO
  • Built-in ceramic patch antenna
  • SAW front-end filter
  • Single conversion superhet
  • Serial modem baud rate at 9600bps (half-duplex)
  • Addressable point-to-point


  • PDAs, organisers & laptops
  • Handheld / portable terminals
  • EPOS equipment, barcode scanners
  • In-building environmental monitoring and control
  • Remote data acquisition system, data logging
  • Fleet management, vehicle data acquisition

Technical Summary

  • Operating frequency: 869.85 / 868.30MHz (Europe), 914.5MHz (North America)
  • Modulation: 16kbps bi-phase FSK
  • Supply: 5V at 18mA transmit (@5mW), 15mA receive/idle
  • Transmit power: +5mW @ 869.85MHz
  • Receiver sensitivity: -106dBm (for 1% BER)
  • 32 byte data buffer