[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: AO-7 Predictability.



Hi John...

Because we are in sunlight for a while, could you outline which parts of the
world will be serviced by which mode let's say, for the next couple of
weeks?

Thanks!

Roger
WA1KAT

----- Original Message ----- 
From: "john hackett" <la2qaa@hotmail.com>
To: <Amsat-bb@amsat.org>
Cc: <eu-amsat@yahoogroups.com>; <allan_gm1sxx@hotmail.com>
Sent: Wednesday, January 18, 2006 5:51 AM
Subject: [amsat-bb] AO-7 Predictability.


> Between the 9th and 19th of January I've observed the mode change from A
to
> B on AO-7 to be consistent and regular. This shows that the 24 hour timer
is
> functioning as it was designed to do ... 31 years! ago.
>
> I assume the reason for the present "predictable" mode changes to be the
> fact that the satellite is not, nor will be, in eclipse until at least
> March.
>
> After checking the log on "THE AO-7 RESOURCE PAGE" I estimated the
> switchover to be at
> approximately 08:30 UTC daily. However, on the 17th of January, I noticed
> the changeover happened at precisely 08:57 ... in the middle of a Mode-B
QSO
> with UA9CP ... so I immediately switched to mode-A and carried on the QSO
> ... therby confirming the time of the mode change on that particular day.
>
> Speculating ... this deviation could be due to the extra temperature seen
by
> the satellite while not in eclipse. Those interesting in the orbital
> mechanics can plug the date and time into their favourite tracking program
> and "see" where the satellite was. The newly updated "AO-7 RESOURCE PAGE"
> now contains links to charts showing the current eclipse forcast.
>
> The designers of this particular piece of hardware must be somewhat
> surprised that it's still functioning after 31 years in space, taking into
> account the radiation bashing it must have experienced in the last three
> decades.
>
> Perhaps AO-7 is not yet finished with dishing out surprises.
>
> The ESA and NASA take note!.
>
> 73 John.   <la2qaa@amsat.org>
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home