TDH2-433-9 : UHF High Power Multichannel Serial Modem

TDH2-433-9 - Datasheet  

Price: $81.51
Ex Tax: $74.10

Technical Summary 

  • Operating frequency: 433.925MHz (default) 
  • Modulation: 16kbps bi-phase FSK 
  • Supply: 5V at 50mA transmit, 22mA receive/idle 
  • Transmit power: +14dBm (25mW) 
  • Receiver sensitivity: -105dBm (for 1% BER) 
  • 32 byte data buffer 
  • Adjacent channel rejection: 60dB @ ±320kHz 


TDH2-433-9 : UHF High Power Multichannel Serial Modem

TDH2-433-9 Multichannel 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


  • 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