when using the trunk TSV file, the control channel frequency(s) in that file override the frequency in the command line which must still be specified but it's basically a dummy.  And yes as you say you should run the RTL at a lower sampling rate to reduce CPU.  When the choppy audio is occurring keep a careful eye on the constellation which compared with the "normal" constellation should give a clue as to whether transmission is the issue.  Also another useful knob to adjust is the RF gain which as usual should be set as high as possible below the overload / intermod threshold.  As far as logging traffic activity, there's no exact provision for that other than the raw symbol option... However that requires some other program to post-process the data, not currently in OP25...

Max

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