Re: [amsat-bb] doppler shift
Good points all, John.
The challenge is that the day of this month's club meeting, which satellites are passing over aren't ideal. But, the sequence you suggest absolutely makes sense otherwise. We'll do our best wish the birds we get.
73!
Nick
------ Original Message ------ Received: Thu, 04 Jan 2018 11:27:56 AM PST From: John Brier johnbrier@gmail.com To: Nick Hart nickhart@usa.netCc: John john@amber.org.uk, AMSAT BB amsat-bb@amsat.org Subject: Re: [amsat-bb] doppler shift
Nobody asked me but I would just start with just listening and gradually adding more components to the mix. Listen to AO-91 on at least one pass because the downlink doesn't require much doppler tuning if at all, then try SO-50 and learn doppler tuning, add audio recording on another pass, add uplink capability towards the end.
On Thu, Jan 4, 2018 at 2:15 PM, Nick Hart nickhart@usa.net wrote:
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@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@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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are solely those of the author, and do not reflect the official views of
AMSAT-NA.
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AMSAT-NA.
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Nick Hart