[amsat-bb] Re: Video: micro-controller doppler tuning
Mark L. Hammond
marklhammond at gmail.com
Fri Feb 5 08:13:15 PST 2010
Thanks for the details.
Question--how does your code deal with 2 satellites in view at the
same? Do you have a priority function, so the higher priority bird
"wins"? And is there a way to change birds during a simulaneous pass
(i.e., override the priority)? Just trying to imagine the device in
Your project is slick! When we built the SAEBRTrack with the Basic
STAMP2 (which uses EasyComm output), I tried to get the frequency data
out and functional to a rig (at the time, a TS-790A). My hope was to
have one box that did both radio control and frequency control. I
got "close" but didn't have the skills to get it working correctly.
But never did we plan to have it calculating the frequencies in the
Keep up the good work!
On Fri, Feb 5, 2010 at 7:32 AM, Bruce Robertson <ve9qrp at gmail.com> wrote:
> On Fri, Feb 5, 2010 at 8:01 AM, Mark L. Hammond <marklhammond at gmail.com> wrote:
>> Very nice, Bruce! What a great project.
>> In the video you mention something about CW--is that an ID for the bird currently being tracked, or what? I might have missed it...
> Correct. The tracker announces the bird in CW as it rises and sets,
> and it periodically announces its azimuth and elevation, like 'HO68
> WSW H[igh]'. The final product is potentially so very small that I
> didn't want a display screen to increase its size unreasonably.
> What it *doesn't* do is provide any prediction. I figure you can print out
> a chart of these things, or just take pot luck as the tracker scans
> through the 10 or so birds for which its EEPROM provides space.
> You can hear the CW announcement during the QSO at the beginning of
> that video, but a clearer indication is 47s through this video:
> What the spectran view in the video shows is how the tracker stops
> tuning the radio while it is announcing in CW, causing doppler shift
> briefly to take over. I need to rewrite my CW library so that it calls
> the tuning function during the elements that are long enough to allow
> it, such as spaces between words.
>> At 01:23 AM 2/5/2010 -0400, Bruce Robertson wrote:
>>>The following video shows the current state of my
>>>doppler-tuning-on-a-chip project. It shows the project's first QSOs
>>>and its stability while tracking a LEO beacon.
>>>Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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>> Mark L. Hammond [N8MH]
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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Mark L. Hammond [N8MH]
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