[amsat-bb] Re: AO-73 Doppler shift
kb2m at comcast.net
Sat Jan 11 05:43:06 PST 2014
This is the way it has always been with this bird, I posted this about a
From: Jeff Griffin [mailto:kb2m at comcast.net]
Sent: Monday, December 9, 2013 9:38 AM
To: 'amsat-bb at amsat.org'
Subject: RE: [amsat-bb] Re: Auburn sat
I also worked AO-73 for the first time this weekend (thanks all involved
for the new sat) and noticed the frequency shift also. As the bird came up I
found my D/L at about 5k higher than the advertised center frequency. What
was different was that by the end of the pass, the D/L ended up about 10k
higher than the Doppler adjustment supplied by PCSat32. It was like, as the
transponder was being used and warmed up it went higher in frequency. I
found that during several QSO's I made, I had to adjust the D/L up several
times. As I had just worked VO-52 this was noticeably different. I'm not
complaining, I just thought this worth mentioning :-)
73 Jeff kb2m
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Andrew Glasbrenner
Sent: Friday, January 10, 2014 4:43 PM
To: Peter Wilson
Cc: <amsat-bb at amsat.org>
Subject: [amsat-bb] Re: AO-73 Doppler shift
Yep, it drifts. Best to tune that one by hand in my opinion. G0MRF addressed
it in an email to the -bb a while ago if I recall correctly.
73, Drew KO4MA
Sent from my iPhone
> On Jan 10, 2014, at 4:26 PM, "Peter Wilson" <protest at virginmedia.com>
> Hi all,
> I'm having great fun on all the operational satellites, including AO-73.
> However, I find that even using CAT control I have to adjust the
> uplink frequency almost constantly throughout the pass.
> I have to shift buy about 3500Hz overall from start to finish,
> increasing all the time.
> Is everyone else seeing the same effect?
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