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Re: [eu-amsat] AO-7 report.



" (and)...correspondence with N1JEZ Mike Seguin (AO-7 control operator)"

It is possible that Mike has some control over modes on this satellite...

Roger
WA1KAT


----- Original Message ----- 
From: "John Hackett" <archie.hackett@hotmail.com>
To: <Eu-amsat@yahoogroups.com>
Cc: <amsat-bb@amsat.org>
Sent: Tuesday, July 31, 2007 4:03 PM
Subject: [amsat-bb] Re: [eu-amsat] AO-7 report.


> Drew,
>          It is my understanding from recent correspondance with
W3GEY/VK3GEY
> Jan King ...
> (Jan 'built' AO-7) ... and earlier correspondence with N1JEZ Mike Seguin
> (AO-7 control operator) when I first posted the mail re: the timer last
year
> .... that the timer is completely random when the satellite comes out of
> eclipse and since there are no imminent occurances of eclipse as far as I
> can see, I assume the mode will not change unless anything 'ontoward'
occurs
> to upset the electronics.
>
> High power *can* affect how the control systems behave ... (obviously, I'm
> not going to mention the command parameters or the power required).
>
> If my assumption is wrong, I stand corrected. In either case, listening to
> the regular operators will confirm the mode.
>
> The mode changes can be viewed at ...
> <http://www.planetemily.com/ao7/stats2.php>
>
> The predected eclipse chart at ...
> <http://www.planetemily.com/ao7/Eclipse.php>
>
> Perhaps other operators will obtain different conclusions from the above
> predictions.
>
> Opinions are are invited.
>
> That is, after all, precisely why we started the EU-Amsat reflector.
>
> I CC'd this mail to the amsat-bb since the number of Stateside users has
> increased in the last 2 months and this information may be of interest to
> them too.
>
> 73 John.   <la2qaa@amsat.org>
>
............................................................................
...............................................................
>
> >From: Andrew Glasbrenner <glasbrenner@mindspring.com>
> >Reply-To: eu-amsat@yahoogroups.com
> >To: eu-amsat@yahoogroups.com
> >CC: amsat-bb@amsat.org
> >Subject: Re: [eu-amsat] AO-7 report.
> >Date: Tue, 31 Jul 2007 11:18:04 -0400 (GMT-04:00)
>
> >Every time this has happened in the past, several times over the past few
> >years, the 24hr timer has >activated, switching between A and B. There is
> >no reason to expect it won't again.
> >
> >73, Drew KO4MA
>
............................................................................
...............................................................
>
> >From LA2QAA.
>
> >A study of the AO-7 eclipse charts for the last 3 years shows a
progression
> >toward non-elipse orbits in late 2007 - 2008.
> >
> >In effect, this means that AO-7 in all probability will not change mode
> >unless anything untoward happens.
> >
> >It also means that we appear to have a permanent mode-B LEO linear
> >transponder for the forseeable future ... providing operators follow the
> >recommended operating proceedure.
> >
> >Please *do* decrease your power as the satellite approaches TCA to avaoid
> >FM'ing.
> >
> >This not only helps the satellite, it helps the other operators in the
> >passband.
> >
> >Don't be fooled by propagation anomolies. The mode-B transponder is
working
> >well and will continue to do so providing the alligators go and play
> >somewhere else. Under normal circumstances you do NOT !! need a lot of
> >power. Please use only the necessary to maintain adequate communications.
> >If
> >you can't copy people adequately, you should improve your receiving
> >capabilities rather than increasing your uplink power ... remember,
> >aluminium is cheap and it's a lot more user friendly to everyone
concerned
> >.... with perhaps the exception of your neighbours.
> >
> >For all intents and purposes, AO-7 is a QRP satellite. Please treat it as
> >such.
> >
> >73 John. <la2qaa@amsat.org>
>
>
> _______________________________________________
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>

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