[amsat-bb] AO-85 "reset" during pass

Burns Fisher burns at fisher.cc
Sun Nov 8 14:56:35 UTC 2015

Thank you for reporting this, Daniel.  This could either have been a
processor reset for some reason, or simply the hang timer on the
transponder timing out not having detected a 67Hz tone in a couple
minutes.  Either one would seem pretty similar.  Neither one is cause
for concern if it came back up.

Processor resets are not unexpected.  In fact they are less common
than expected.  They are usually caused by radiation of various sorts
in space (low energy protons etc) temporarily messing up the
processor.  A reset and/or a power cycle as so far always sufficed to
fix the problem.

I just checked the latest telemetry we have on the server, and there
are not yet any reports of a processor reset, but right now, AO-85 is
over the South Pacific.  A close-to-overhead pass coming up soon.

Thanks again and 73,

Burns W2BFJ
Fox-1 Flight Software

P.S.:  Everyone who reads this in North, Central, and northern South
America:  Just a reminder: Please remember that we are testing the
satellite today.  Please collect telemetry (if any) and listen but
don't transmit.  In Europe, Asia, Oceana, etc etc...feel free to use
the transponder and report what it sounds like if we manage to shift
to carrier operated mode.

On Sun, Nov 8, 2015 at 9:37 AM, Daniel Estévez <daniel at destevez.net> wrote:
> Hi all,
> An unusual thing happened during AO-85 last pass over Europe, at about
> 14:20 UTC or so. The transponder stopped working and the satellite went
> silent for about a minute. Then came the voice announcement in the lines
> of "Hi! This is radio amateur satellite Fox 1", and some seconds later
> the transponder started working again. I'm sorry that I have no
> telemetry recording of the pass to try to see what happened.
> 73,
> Dani M0HXM/EA4GPZ.
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