[amsat-bb] Operating SSB sats

[Devin L. Ganger]

Could this be related to the fact that some radios cannot change the VFO that is being actively transmitted on?


--
Devin L. Ganger (WA7DLG)
email: devin at thecabal.org
web: Devin on Earth
cell: +1 425.239.2575

> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of
> k6vug at sbcglobal.net
> Sent: Wednesday, February 6, 2019 9:42 AM
> To: AMSAT BB <amsat-bb at amsat.org>
> Subject: [amsat-bb] Operating SSB sats
> 
> Good Morning All,
> I'd like to understand something that seems to be happening with SSB birds.
> 
> I realize that they are two kinds of operators - one that has a computer
> controlled station and one that tunes manually, and I respect both
> types.  The following observation is about two computer controlled stations
> working via a SSB satellite -
> 
> (a) My station is computer controlled (SatPC32 or HRD) and can hear myself
> on the downlink throughout the pass.  I can also go up or down the pass band
> and still hear myself without needing to retune the uplink.   It is pretty rock
> solid, almost like HF operation.
> 
> (b) Sometimes I hear a station calling CQ and it remains on the same
> frequency during successive CQs, so I'm guessing their station is also
> computer controlled.  I can tune in and stay on their calling frequency.
> 
> (c) However, when I can respond, it seems they have to tune their downlink
> a bit to hear me well.  So when they come back to my response, they are a
> bit off-frequency (about 300Hz) and sound like Mickey Mouse, until I retune
> the downlink to hear them well again.  This keeps happening throughout the
> QSO.
> 
> (d) This "drifting" happens only with some stations calling CQ and not
> everyone.
> 
> Considering both stations are computer controlled at each end, I'm trying to
> understand if I'm doing anything wrong/incorrect.  Learning to operate SSB
> sats has been humbling as well as exciting, I'd appreciate any pointers for this
> situation. Thanks in advance.
> 
> 
> 73!
> Umesh
> k6vug
> 
> 
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