A good one is the CMX469 from CML.

>For example, program a radio to send PTT ID >(beginning of trasmission) for unit ID 1234 and >the payload will be 01801234(Hex).

Do you have a description of these two bytes ?
(0180) I haven't found any.

Thanks.

>The signaling is encoded at 1200 baud using >FFSK (MSK) @ 1200Hz/1800Hz. First there is a >56 bit preamble, then a 40 bit word sync, >and then either 1 or 2 112 bit codewords for >a packet length of 173 ms for one codeword >or 267 ms for two codewords. Seems to be the same as MDC4800. >The 112 bit ...

Thanks, I have seen the 4,590,473.
There are also the 4,518,068 and 4,517,561 that may be related.

What I would like to know :

- What are the interleaver used ?
- What are the convolutional code polynomials used ?

Haven't anyone reversed engineered the MDC1200 protocol ? Seems to be a not so hard task.

I know it is patented, but what is its patent number ?