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ikj1234i at yahoo.com ikj1234i at yahoo.comYeah 61 PPM seems very high -what do you see the signal when you look at the spectrum plot (you may need to use the +/- keys to bring the spectrum into view) Try starting scope.py with no -c option at all (or -c 0), then look at the "C4FM" display and the "data scope", and use the "fine tune" slider to center the signal horizontally. You may need to try -c 5000 (or -c -5000) to get the signal initially close enough so the slider is able to center it. Eventually you should be able to come up with a value for -c such that the signal is centered without needing to use the fine-tune slider... 45000 seems too high - I'd expect that about +/- 10000 would be as much as you'd ever need at 800 MHz, but I haven't experimented with the RTL yet... Max -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/op25-dev/attachments/20140119/67898cc9/attachment.htm>