[amsat-bb] PSAT2 Anomaly?

[Robert Bruninga]

>  Is there any type of auto reset that occurs on PSAT2 after a week or so?

Yes, power is cycled to the TNC if there is more than one minute since the
PTT was keyed.  That has always made sure that if it ever stops
transmitting, it will automatically get a powercycle reset.  That is why we
have never seen any of my satellites not transmit (if it has power)...

Then there is the automatic 8 day time-out hardware reset.
And finally, there is the backdoor firecode reset.  We will try that
tomorrow.
But if the 1 minute power-cycle reset is not bringing it back, then I
cannot imagine how any of the others will...

Bob


> On Fri, Aug 23, 2019 at 2:53 PM Robert Bruninga via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
>
>> The usual PSAT2 downlink stopped after 0809z today in a pass over SE USA.
>> Ground Stations are fine because its sister, USNAP1, is still downlinking
>> via the usual ground stations.
>> Both downlinks visible on http://aprs.org/sats.html
>>
>> A cessation of our Amateur packet telemetry design has never happened in
>> 18
>> years in space over 6 successful spacecraft other than the occasional low
>> power crash which is fixed after the next eclipse on the next pass or so.
>> But never a complete cessation.
>>
>> Since the UHF side is independent,  we welcome folks to listen to the UHF
>> downlink 435.350 +/- Doppler and verify if that is working.  Remember, it
>> must be in daylight for the SSTV downlink to be on.
>>
>> Fortunately we do have one report of an SSTV image at 1340z from Gustave
>> LW2DTZ.  If we have another confirmation that UHF has been heard, then we
>> can rule out a possible collision with space debris. (we get notificaitons
>> of near conjunctions passing within 500m about every day or so, but after
>> 18
>> years we have come to ignore them.  Maybe this one hit?
>>
>> And it was working so well!
>> Bob, WB4APR
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>