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<p>Hi John<br><br>we need to do a better job of documenting the process of initial acquisition of the system. The process itself could be made easier, as could 1,000 other things...<br><br>Could you post the command line you're running, and if possible post a screen print of the 'datascope' and 'constellation' plots...<br><br>The best approach usually has been to first get the control channel coming in well in manual tuning mode (i.e., no -T parameter), then (and only then) to try to get voice decode working. In rx.py the way you'll know when the CC is tuned correctly is the number in the upper-right corner of the page (TSBKs) should be increasing steadily. Assuming you have the correct CC frequency, the most common troubles tuning are: not using the proper PPM correction (-q parameter), failing to add an offset (I usually use -o 50000), incorrect RTL gain setting via the --gains (-N) parameter, incorrect use of FSK4 mode on an LSM P25 system (and vice-versa, using the CQPSK mode on a C4FM P25 system)... Tuning in the CQPSK mode is fussier than in FSK4 mode, and messages should get written to the stderr file in the event of a slight mistuning... <br><br>Max</p>
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