[amsat-bb] AO-92

[Andrew Glasbrenner]

A few factors probably involved: 

AO-85 saw less use due to being a little harder to access. It was also in a higher orbit, that wasn’t sun-synchronous with a near 12 o’clock LTAN, so it saw more sunlight. 

 

73, Drew KO4MA

 

From: Bill Gaylord <chibill110 at gmail.com> 
Sent: Monday, September 14, 2020 6:31 PM
To: Andrew Glasbrenner <glasbrenner at mindspring.com>
Cc: Roy Dean <royldean at gmail.com>; AMSAT BB <amsat-bb at amsat.org>
Subject: Re: [amsat-bb] AO-92

 

Just wondering why AO-92 is failing so much quicker than AO-85. AO-85 lasted about 4 years in space till it went silent / started having battery issues. AO-92 has only been in space for about 2 and 3/4 years.  

 

 

 

AO-91 seems to be doing okay. Or at least I haven't seen anyone talking about it going into safemode. And I haven't heard it in safemode. 

 

73

William KD9KCK

 

 

On Mon, Sep 14, 2020 at 5:14 PM Andrew Glasbrenner via AMSAT-BB <amsat-bb at amsat.org <mailto:amsat-bb at amsat.org> > wrote:

I've mostly been posting about it on Twitter.

AO-92 has a cell that's failing, and towards the end of many eclipses it
goes into auto-safe mode at 3.6v. If the battery drops low enough the IHU
resets, and it comes back up in normal safe mode. Mark and I have been
commanding to repeater mode on the first available pass after the resets,
but it's not a long term sustainable answer. Last night Mark commanded the
transmitter completely off while we consider a plan of action.

Leaving autosafe on and the tx off, we may be able to turn the repeater on
ad-hoc for weekends or such, completely dependent on command station
availability. Turning autosafe and the IHU off like we did with AO-85 will
kill the satellite pretty quickly, so that's not a good response either. So,
we'll look at resets and battery states before this weekend and see where we
stand.

73, Drew KO4MA
AMSAT VP Operations

-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces at amsat.org <mailto:amsat-bb-bounces at amsat.org> > On Behalf Of Roy Dean via
AMSAT-BB
Sent: Monday, September 14, 2020 4:55 PM
To: amsat-bb at amsat.org <mailto:amsat-bb at amsat.org> 
Subject: [amsat-bb] AO-92

I can find no information about AO-92 going silent recently.   Was it
commanded into a silent state (as AO-85 was shortly before it went silent
permanently)?

--Roy
K3RLD
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_______________________________________________
Sent via AMSAT-BB at amsat.org <mailto:AMSAT-BB at amsat.org> . AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb