VHF 500mW RS232 radio modem

M48-169-BiM1H VHF radio modem

Frequency:169.4125 or 169.5625 MHz

The M48-169-BiM1H presents M48 modem IC combined with a BiM1H radio module and suitable interface circuits, power supplies, connectors to provide a complete RS232 radio modem interface. Optionally, the board can be housed in an EAS80 extruded aluminium housing. In the simplest case, a pair of these units (with suitable aerials and power supplies connected, of course) can be connected directly to the serial ports of a pair of industrial PCs and the  resulting  wireless data link used without any further installation or programming.


  • Usable range over 10km
  • 500mW RF power output
  • 5kbps pulse duration coded protocol
  • Synchronisation codes and checksum to reduce false triggering on noise
  • Programmable transmit address and four receive addresses
  • Programmable timing parameters (preamble length, etc)
  • Programmable serial modem baud rate (1200 - 76800 bps, half-duplex)
  • Addressable point-to-point and point to multi point
  • Packet acknowledge/resend (ACK) mode
  • Store and forward repeater function


  • Asset Tracking and Tracing
  • Automatic remote Meter Reading (AMR)
  • PDAs, organisers & laptops
  • Handheld / portable terminals
  • Remote operated vehicles
  • Data loggers
  • In-building environmental monitoring and control
  • Industrial (SCADA) telemetry and M2M systems
  • Fleet management, vehicle data acquisition