MDC-1200 (Motorola Data Communications) - aka "Stat-Alert," and/or "MDC-600" - is a Motorola two-way radio low-speed data system using audio frequency shift keying, (AFSK). MDC-600 uses a 600 baud data rate. MDC-1200 uses - you guessed it - a 1200 baud data rate.
Mark and space tones are 1,200 Hz and 1,800 Hz. The data are sent in bursts over the radio system's voice channel. MDC signaling includes a number of features: unit ID, status buttons, emergency button, selective inhibit, radio check, and selective calling. These features are programmable and could be used in any combination desired by the user.
In addition to Motorola, at least two other companies make compatible base station decoders for MDC-1200. Motorola radios with MDC options have an option allowing the radio to filter out data bursts from the receive audio. Instead of hearing the AFSK data, the user hears a short chirp from the radio speaker each time a data burst occurs. (The user must turn on this feature in the radio's option programming settings).
But you will not be using CHIRP to program your Motorola radios.
Clint Bradford K6LCS 909-241-7666
---------------------------------- Clint Bradford, K6LCS http://www.clintbradford.com