[amsat-bb] Fox-1A (AO-85) in safe mode over Europe Jun 5 21:25?

[Zach Leffke]

Out of curiosity, is there a state diagram anywhere that is publicly 
available for any or all of the Fox Series, showing the various 
potential modes and the causes for state transition?  I'm mainly 
interested in using it (or them if there are variants available) as an 
introductory teaching/training tool for students getting into cubesat 
development and writing code for flight computers.  I've got my own made 
up versions of what I might guess an overall state diagram might look 
like and the various causes of state transition for a cubesat (IHU 
reset, ground command, bus/battery voltage dropping below thresholds, 
etc.), but it would be much better if I could show a real world example.


Thanks in advance!

Zach, KJ4QLP

Research Associate
Aerospace Systems Lab
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305

On 6/6/2018 10:08 AM, Andrew Glasbrenner wrote:
> As a follow-up, if the satellite has an IHU reset while in auto safe mode,
> it reboots to safe mode. This apparently happened last night or yesterday. I
> commanded it back to Transponder mode this morning.
>
> 73, Drew KO4MA
>
> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of Andrew Glasbrenner
> Sent: Tuesday, June 05, 2018 5:50 PM
> To: 'Zach Metzinger' <zmetzing at pobox.com>; amsat-bb at amsat.org
> Subject: Re: [amsat-bb] Fox-1A (AO-85) in safe mode over Europe Jun 5 21:25?
>
> It has been dropping into Safe Mode at the end of eclipses for a little
> while now. It's a planned feature to protect the batteries from excessive
> discharge.
>
> 73, Drew KO4MA
>
> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of Zach Metzinger
> Sent: Tuesday, June 05, 2018 5:30 PM
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] Fox-1A (AO-85) in safe mode over Europe Jun 5 21:25?
>
>
> Hello all,
>
> I've been using (the most amazing) http://vhf.pi5fts.nl/ WebSDR to listen to
> passes on the other side of the globe.
>
> I noticed that Fox-1A was announcing "Safe Mode" with what sounds like
> 9600 bps telemetry. Is this normal?
>
> I didn't catch the voice announcement, but I do have a WAV file of the
> telemetry.
>
> --- Zach
> N0ZGO
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
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> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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