Multi-mode two-way radio processors offer Marine Digital Selective Calling expansion sequences

July 01, 2013 // By Jean-Pierre Joosting
The CMX7031 and CMX7041 multi-mode two-way radio (TWR) processors, operating in Marine VHF mode, have been enhanced to enable the ITU-R M.821 recommendation: marine Digital Selective Calling (DSC) expansion sequences. Continuous transmission mode has also been included for use in distress alert situations.

Standard marine DSC only allows a position resolution down to approximately one nautical mile (1 nmi). In distress situations this is not accurate enough to pin-point a precise position.

The DSC expansion sequences allow precise geographical coordinates to be transmitted, providing position accuracy to less than one metre (1m).

Imagine the situation of a diver in rough seas with strong currents, calling to be picked-up. Providing a 1 square nmi collection position will prolong recovery and potentially put the diver at risk.

A Marine VHF radio with the DSC expansion sequences enabled, would allow the diver to transmit an accurate collection position, down to 1 square metre, ensuring a safe and swift recovery.

The CMX7031 and CMX7041 multi-mode two-way radio processors are built on FirmASIC component technology allowing on-chip sub-systems to be reconfigured by a Function Image (FI).

These devices enable a revolutionary new platform approach to radio design, enabling multi-mode analogue two-way radios to be developed based on a single radio platform, conforming to many systems: PMR, LMR, trunking, marine, aviation, amateur radio, NOAA weather radio and packet data radio.

Key features include: full audio baseband processor with selectable processing order, marine DSC signalling and expansion sequence; programmable voice-band scrambler, NOAA and NWR operations, and DTMF encoder.