[amsat-bb] doppler shift

[John]

Hey now, don't shoot the messenger! The vast majority of my AMSAT
demonstrations are done with groups of scouts of various ages, and the last
thing they need to see is me focussing more on the radio than making sure
they understand what's going on!

If I've got a piece of software that can correct for doppler shift for me,
and it can manage pointing my antennas in the right direction, then it
leaves my focus available for the actual operating, and the explanations to
the young people who could well be the next generation of amateur radio and
AMSAT enthusiasts ;) I think that's a far better use of my resources than
sitting there with my back to the people I'm supposed to be introducing to
the hobby, and focussing on turning dials and pushing rotator controller
buttons...

John (XLX)

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of
jim at k6ccc.org
Sent: 04 January 2018 17:46
To: amsat-bb at amsat.org
Subject: Re: [amsat-bb] doppler shift


 
Ya know, you could MANUALLY tune.  It does work.  In fact I strongly
preferred manually tuning for doppler shift vs computer corrected.
 
Jim
K6CCC

-----Original Message-----
From: "John" <john at amber.org.uk>
Sent: Thursday, January 4, 2018 02:10
To: "'Dave L'" <kb0rfy at q.com>, amsat-bb at amsat.org
Subject: Re: [amsat-bb] doppler shift



Hi Dave,

When you say your doppler is too far ahead or behind, do you actually mean
your overall frequency, or do you mean your split distance?

If you mean your overall frequency then that's really odd, as SatPC32 has
always put me smack bang in the middle of the pass-band if using linears
(with the correct locator set on login). If this isn't the case you can
adjust it in the settings files, but it's generally calculated based on your
locator and the Keplerian data you can download (and should be updating
every time you open up the app). If, however, you mean your offset (ie
finding your own downlink) then this is always a bit variable for me, but
usually pretty close.

SatPC32 does, in my experience, remember your offsets when you adjust them
(in my case either with the + and - buttons, or the pot at the top right of
the rig), so that next time you hit that satellite it keeps the same
offsets. You may find your offset is slightly different on different passes,
or you may find it's exact every time, but that's part of the fun with
linears - finding yourself first!

Hope that helps.

73,
John (XLX)

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Dave L
Sent: 03 January 2018 23:32
To: amsat-bb at amsat.org
Subject: [amsat-bb] doppler shift

I'm useing satpc and a Yaesu ft-847.

Fm birds are not a problem. SSB I'm either to far ahead or behind.

Any hints or advice would be appreciated.

radio and ant are comp controled

thanks

dave

kb0rfy

_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb

_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb