[amsat-bb] PSAT spinning fast?

Robert Bruninga bruninga at usna.edu
Sun Jul 19 19:29:42 UTC 2015

On the last pass 1500 EDT or so, I was hearing a fade almost every 3
seconds in the PSK31 audio downlink.  That would be 20 RPM.

So I upped the Sun Vector telemetry sample rate to the highest to get now
24 samples per minute.  But this plot shows only about 6 RPM.  But if the
audio is right, then we are sampling below the Nyquist rate and so the plot
can be aliasing…

So the question is. What do “you” hear as the audio spin rate in the PSK31
downlink on 435.350?

Bob, Wb4APR

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