UHF High power serial modem

The TDH2 is a 9600baud half-duplex multi channel OEM radio modem with a power output of 25mW. It is a 100% pin-compatible drop-in replacement for the Radiometrix TDL2A and can be used to replace the TDL2A in applications where greater radiated power is desired. TDH2 acts as a transparent serial cable to attached host. TDH2 is an intermediate level OEM radio modem which is in between a raw FM radio module like BiM2 and a sophisticated OEM radio modem like SPM2. It takes care of preamble, synchronisation, bit balancing and error checking along with automatic noise squelching

Key Facts


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RF Power

RF Power

Data Rate

Data Rate

Operational Range

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Operational Range


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Two way

Data sheet


  • High quality, stable crystal reference
  • Low noise synthesiser / VCO
  • Carries ASCII and RTU MODBUS messages
  • SAW front-end filter
  • Multi-stage ceramic IF filtering
  • Single conversion superhet
  • Serial modem baud rate at 9600bps (half-duplex)
  • Addressable point-to-point
  • 5 serial select wideband channels
  • Data Present indication
  • Fully screened. Low profile
  • Available as TDH2T transmitter and TDH2R receiver for one way communication
  • Conforms to Australian/New Zealand AS/NZS 4268:2003


  • Handheld terminals
  • EPOS equipment, barcode scanners
  • Data loggers
  • Industrial telemetry and telecommand
  • In-building environmental monitoring and control
  • High-end security and fire alarms
  • GPS systems
  • Vehicle data up/download

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