[amsat-bb] Re: AO-73 Doppler

[Joe Fitzgerald]

> I notice that the frequency calculated by MacDoppler is slightly off from
> the frequency that I hear the telemetry at.

AO-73's transmit frequency drifts around as the spacecraft warms and
cools.  I remember being surprised to see the telemetry trace increase in
frequency on my waterfall display when my receiver was at a fixed
frequency.  I initially  thought something was wrong with the local
oscillator in the radio, but my signal generator showed a nice straight
vertical line.

There is likely nothing wrong with your setup.

-Joe KM1P