[amsat-bb] Re: SatPC32 Help Needed
w9ae at charter.net
Thu Oct 7 11:39:32 PDT 2010
David Palmer wrote:
I seem to have to adjust ± 100 to 200 Hz at the start of the pass, and
periodically during the pass, to keep my return pitch constant.
I have to make similar corrections when SatPC32 tunes my FT-847. One
likely cause is that the radio's local oscillator drifts slightly when
transmitting due to heat generated by the transmitter. My FT-847
transmit frequency drifts noticeably when I transmit on 435 MHz with
high power. It drifts less when I transmit at low power. Unless your
radios have high-stability oscillators I think it's normal to need to
correct the frequencies by 100-200 Hz.
From one pass to another, the local oscillator on the satellite might
also drift slightly due to changes in temperature.
Wayne Estes W9AE
Oakland, Oregon, USA, CN83ik
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