[amsat-bb] Re: AO-7 report.- Band switching

Reicher, James JReicher at hrblock.com
Mon Aug 6 12:51:09 PDT 2007

Yo, people!!!  You're all missing out on history!  In the past, when AO7
has gone out of eclipse, the timer has functioned almost exactly to
specs.  If the timer has performed as designed over the past 36 years,
why should it suddenly fail? 

 Here's an email copy from Emily, ex W0EEC (sorry, Emily, can't remember
your new call :)  ) regarding AO-7's schedule 

I pulled this from the archives.  The URL is:

73 de N8AU, Jim in Raymore, MO
Light travels faster than sound...  This is why some people appear
bright until you hear them speak.


Subject: [amsat-bb] AO-7 on a 24 hour schedule? 
From: Emily Clarke <w0eec at xxxxxxxxx> 
Date: Sat, 14 Jan 2006 11:32:14 -0800 

I've been going over the AO-7 logbook and it appears that AO-7 is 
being "controlled" by a timer that toggles between Mode A and Mode B 
every 24 hours.  This timer was probably reset when the satellite 
went into eclipse, however since the AO-7 is not going into eclipse 
at the moment this bit of programming onboard AO-7 seems to be in

The exact time when the mode change takes place is not known for sure 
(at least by me - perhaps a control station knows the answer) but 
from the log it seems to happen sometime between 0830 and 0930 
UTC.  There is no long time data on the stability of the timer at 
this time, so the estimated time at which changes occur is no guarantee.

AO-7 will not enter eclipse until 14 March 2007.

To view the AO-7 Logbook go to (simplified URL):


Date: Mon, 6 Aug 2007 07:23:46 -0300
From: "Roger Kolakowski" <rogerkola at aol.com>
Subject: [amsat-bb] Re: AO-7 report.- Band switching
To: <la2qaa at amsat.org>, <wa6fwf at sbcglobal.net>
Cc: allan_gm1sxx at hotmail.com, amsat-bb at amsat.org,
	Eu-amsat at yahoogroups.com
Message-ID: <004001c7d813$e2c3a7c0$0200a8c0 at Tanguray>
Content-Type: text/plain;	charset="iso-8859-1"

Hi John...

Thank you for answering my questions, I now have an understanding of
basis for believing that the timer no longer functions or is random at

I am now willing to wait quietly for the Eclipse-free date. Has it been
estimated or calculated?

Many thanks!


----- Original Message ----- 
From: "John Hackett" <archie.hackett at hotmail.com>
To: <wa6fwf at sbcglobal.net>
Cc: <rogerkola at aol.com>; <amsat-bb at amsat.org>;
<allan_gm1sxx at hotmail.com>;
<Eu-amsat at yahoogroups.com>
Sent: Monday, August 06, 2007 5:36 AM
Subject: [amsat-bb] Re: AO-7 report.- Band switching

> Hello Kevin, Roger,
>                           Kevin, I'm glad you dug out one of my
> posts re: the timer issue.
> (Roger, I'm the chappie the >>>>'s are referring to in the following
> <http://www.amsat.org/amsat/archive/amsat-bb/200601/msg00455.html>
> Like I already mentioned ... and Kevin repeats ... it's no big deal,
> just wait and see.
> If I'm wrong, I'm wrong, no harm done. Lets not waste anymore
bandwidth on
> it ok? ...
> however, Roger, it would be impolite of me not to answer you
> >I would love to hear your version of what will happen when there is a
> >of eclipse for the satellite
> As I previously mentioned, I would expect the satellite to remain in
> mode it was in as it came out of eclipse. As I also mentioned, I would
> corrected if that doesn't happen ... ie ... it is
> not !!! a big deal and if I'm wrong ... I'm wrong ... no harm done.
> Please note that I am *NOT* the first AO-7 operator to come to this
> conclusion.
> >Are you saying AO-7 went up without a timer?
> No ... I'm not saying that, I am saying that the designer and
> the apparatus in question told me that the components used were not as
> stated in the 1974 newsletter.
> <Are you saying the timer is no longer functioning?
> I have said earlier and am saying now !!! ... that the timer functions
> PERIODICALLY ... as can be seen by the entries in the log for the last
> years ... (monitored by myself).
> Perhaps a re-read of my original mail might be of value here?.
> The intent ... to make a simple observation for the benefit of those
> don't necessarily follow the daily "doings" of AO-7 like I do.
> Nothing more - nothing less. No form of criticism to anybody or
> offered or implied.
> >how is it you determined that the timer is no longer "in the mix?"
> By monitoring the satellite daily for the last 3 years.
> >If AO-7 comes out it's "final" eclipse in Mode A, will it stay
> Who knows !!! ... I certainly don't. I think the real experts all
> it *random* ... the reasons are many and varied ... *NOT* just
> and age.
> CC'd to interested parties.
> 73 John.   <la2qaa at amsat.org>   AO-7 Resource Page Admin:
> _______________________________________________
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