UHF NBFM multi channel RS232 radio modem

M48-433-USX2 UHF multi channel modem

Frequency:433MHz or 458MHz band

The M48-433-USX2 presents M48 modem IC combined with a USX2 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 1km (@ 100mW RF power)
  • Up to 100mW RF power output: adjustable via serial command
  • 128 serial select channels
  • 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 auxiliary serial output (to program radio modules)
  • 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


  • 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