[amsat-bb] doppler shift

[Nick Hart]

I'm glad you mentioned scouts, John. 

I counsel for the radio merit badge for our local scouts, and Elmer our local middle school's radio club. In the club last month, we completed tape measure yagis. And, for this month's radio club meeting, I was planning on having the kids working a couple of birds passing during the meeting time. 

I figured that with 10 kids, we could have them in teams for tracking, tuning, recording and operating under my supervision. I thought it would be good for them to try to do everything manually once for two reasons. One is to show that's it's doable on a minimum budget by a teenager. And, the other is so they'll have an appreciation of everything our more automated rig will do during our ARISS QSO in March. 

From your comments, I'm rethinking that strategy a bit. Do you think that's too much?

73!

Nick

> On Jan 4, 2018, at 9:57 AM, John <john at amber.org.uk> wrote:
> 
> 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
> 
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> expressed are solely those of the author, and do not reflect the official
> views of AMSAT-NA.
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> _______________________________________________
> 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
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> _______________________________________________
> 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