27 Jul
2014
27 Jul
'14
5:24 a.m.
On 07/22/2014 07:49 AM, wa4hfn@comcast.net wrote:
SSB/CW birds are the only way to go and if you build it they will come .
Think about what it would be like to tune for Doppler while working SSB through a LEO satellite on microwave.
Before you say "computer control", work out the effect of even a tiny error in your clock or orbital elements on a high elevation pass and remember that SSB has no carrier or pilot tone for closed-loop frequency tracking.
Sure, you could have a second receiver track the satellite's beacon. But if you're going to all that trouble, why not just have it track a single high speed data stream from the satellite, one that's much less affected by Doppler in the first place?