[amsat-bb] Re: AO-27 Schedule driver?

George Henry ka3hsw at earthlink.net
Thu Jan 18 16:59:44 PST 2007

As near as I can tell, it is now on a strictly time-driven, repeating 
schedule lasting 1:40:48, with the analog mode starting 20 seconds into the 
schedule and lasting 6 minutes.

If you haven't already, download the AO-27 Scheduler program my son wrote 
for me from http://www.cs.rit.edu/~cjh9783/programs/satsched.php ...  it's a 
very handy way to see at a glance what mode the bird is in, and to predict 
future passes when it will be in analog mode while in view of your station. 
I just do a side-by-side comparison of SatPC32's WinAOS output with the 
AO-27 Scheduler output for the next week.  The calendar even lets you look 
ahead as far as you want (assuming the schedule or epoch data don't change 
in the meantime).

George, KA3HSW

----- Original Message ----- 
From: "Robert Bruninga" <bruninga at usna.edu>
To: "'Howard Stephenson - K6IA'" <hlstephenson at gmail.com>; 
<amsat-bb at amsat.org>
Sent: Thursday, January 18, 2007 8:07 AM
Subject: [amsat-bb] AO-27 Schedule driver?

> Regarding AO-27:
> Fantastic news about AO-27.  Gives us something to use at
> schools to demo AMSATS...
> I think I have read most of the pages, but I cannot find the one
> thing I am looking for, and that is the top-level "rules" that
> are driving the new scheduling.  I am not talking about code or
> epoc or anything like that, but simply, the human logical
> "rules" that tell the schedule, what to schedule...
> In the past, the TEPR algorithm was very simple and could be
> explained as "time since entering the sun".  This was easy to
> interpret and anyone could easily visualize or "see" what this
> meant realitive to his time of day, and location.  Nothing
> needed to be consulted...  Just look at the track of the
> satellite on the map and your relation to the terminator, and
> you know if it is useable..
> The TOPR schedule seems to be wholy "time" driven from EPOC, but
> I have not been able to find what the top-level "rules" are that
> drive that algorithm so that I can learn to visualize it. The
> new on-line "schedules" are teriffic, and a good example of
> computer dissimination of live info, but it requires detailed
> consultation of printed schedules daily and having to match
> times with orbits, I'd rather just understand what the scheduler
> "intended".
> Is this new schedule system still driven by the simple rule of
> "turning it on for X minutes after entering the sun"? Or is it a
> smarter rule that says "turn on over USA, Europe, Australia and
> Japan?" or, "turn on over those countries only while in the
> sun", or, turn on for 10 minutes out of every hour, or what?
> So, can someone point me to this top-level "rule" that is used
> to drive the schedule?  For routine operations, it is easier to
> learn the rule, than to have to look at a schedule every day...
> Thanks
> Bob, Wb4APR
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