[amsat-bb] Amsat Journal - South Atlantic Anomoly

Jerry Buxton n0jy at amsat.org
Wed Feb 28 21:36:06 UTC 2018

Hi Roy,

I follow Curious Droid too and this piece on the SAA, as are his others
in general, are interesting and good information.
>From the Fox-1 perspective, it was known early in the design that the
SAA would/could have a big effect on operation and lifetime so designs
take into account the best choices of COTS parts able to "weather the
storm" as well as the operation of the IHU and radio in general.  The
resets are expected and we believe they may in some instances not even
be noticed by satellite users (other than the reset number increment)
because the radio is designed to operate without the IHU, albeit without
telemetry as well, in the expectation that the IHU will fail sooner than
the RF systems over the lifetime of the satellite.

In addition, the Vanderbilt University radiation experiments on Fox-1A,
Fox-1B, Fox-1C, and Fox-1E are all designed to observe the effects of
the SAA as well as other charged particle events on COTS components.

So at least I enjoy what we see in the SAA including resets, in fact the
occasional reset outside of the SAA or auroral oval is what catches my
eye since it is unexpected!

Jerry Buxton, NØJY

On 2/28/2018 13:55, Roy Dean wrote:
> Just FYI:
> In the latest Amsat Journal there is a story about Fox Telemetry that
> includes an interesting analysis of restarts in relation to the SAA.
> (apologies, I can't remember the name of the author or the title)
> By coincidence, one of the YouTube channels I watch is "Curious Droid",
> which recently released a video on this exact topic.   Serendipitous timing:
> https://youtu.be/ErmEiAJG22A
> Interested to hear if it's accurate, or just blather - I'm not smart enough
> on this topic to distinguish between the two.
> ---Roy
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