VHF Radio Packet Modem

Frequency:Standard: 151.300,173.225 & 173.250MHz

The VHF Radio Packet Modem (RPM1) is a low cost intelligent radio packet modem that enables a two way radio network/link to be simply implemented between a number of digital devices. The RPM1 uses addressable data packets with error checking, packet acknowledgements and retransmissions to achieve a reliable transparent wireless data link. Built for ease of use and rapid installation, the serial interface ensures direct connection to microprocessors or to RS232 port via RS232 driver while remote configuration enables post installation setup of the modem.


  • Addressable point-to-point mode
  • Point-to-Multipoint and broadcast modes
  • Inverted RS232 interface at 5V or 3.3V CMOS level
  • DTE speed 600-115200bps
  • Overall throughput: 3.7kbps with ACK and 5.3kbps wothout ACK
  • Single 5V or 3.3V (10mW max.) supply
  • Flow control - Hardware (CTS), none
  • Usable range over 1km
  • Built-in command line configuration
  • Built-in RF link diagnostics
  • Remote over-air unit configuration
  • Low operating current, Auto standby mode
  • Conforms to European ETSI EN 300 220-3 and EN 301 489-3 (at 10mW)
  • Conforms to Australian/New Zealand AS/NZS 4268:2003 (at 100mW)
  • Dimensions - 39 X 23 X 15 mm
  • Available as RPM1T transmitter and RPM1R receiver for one way communication


  • GPS (NMEA) position reporting
  • Telemetry and telecontrol
  • EPOS equipment, barcode scanners, belt clip printers, stock control, job allocation
  • Remote data acquisition system, data loggers
  • In-building environmental monitoring and control system
  • High-end security and alarm signalling
  • Automated Monitoring and Control Systems
  • Fleet management, vehicle data acquisition