[amsat-bb] Rapid frequency change on ARISSat pass

Ronald G. Parsons w5rkn at w5rkn.com
Tue Jan 3 16:27:48 PST 2012

On the nominal 0015 UTC pass over Texas, the ARISSat-1 telemetry seemed normal but at about 4-5 minutes before LOS, the frequency of the CW marker and the BPSK telemetry envelope started dropping very rapidly. I lost track how many times I had to adjust the Doppler-corrected frequency down by 100 Hz. Then suddenly, the telemetry signal stopped.


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