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@amsat.org] On Behalf Of jim@k6ccc.org Sent: 04 January 2018 17:46 To: amsat-bb@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@amber.org.uk Sent: Thursday, January 4, 2018 02:10 To: "'Dave L'" kb0rfy@q.com, amsat-bb@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@amsat.org] On Behalf Of Dave L Sent: 03 January 2018 23:32 To: amsat-bb@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
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_______________________________________________ Sent via AMSAT-BB@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@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