[amsat-bb] AO-95 Rx problem

[Mac A. Cody]

Interesting!  Didn't know that data was available on line.
Is there a more detailed presentation of the data in, say,
a spreadsheet for a greater period of time than what
is presented?  This would be very helpful in performing
any detailed analysis.  Is all of the telemetry presented
on the web page?  All data would be valuable in trying
to make any correlations.

Where in the receive chain is the RSSI measured?  Has
an attempt been made yet to transmit a strong signal
(modulated or unmodulated) during an overhead pass
to try to 'nudge the needle' on the RSSI meter?  Perhaps
successively stronger transmissions could be made to
see at what power level any change occurs in the RSSI
without applying too much power.  I recall someone
mentioning approaching an EME operator to attempt
transmitting at AO-95 with significantly more power than
normal.

Why does the 'Battery I32C' indicate 'FAIL' (although I see
that this is the same for the other FOX satellites)?

73,

Mac Cody / AE5PH

On 12/17/18 1:02 PM, H. Stephen Nipper wrote:
> Mac, you can look at the data coming down from the satellite and maybe 
> answer some of the questions that you asked.  To my untrained eye it 
> appears that the solar panels are all working.  I am sure that the 
> team understands that data and what it means more than me.
>
> http://www.amsat.org/tlm/health.php?id=3&port=
>
> So if you look at RSSI line you can see the receiver. Click on it.  
> It's flat line.
> http://www.amsat.org/tlm/graph.php?sat=3&field=RSSI&raw=conv&reset=0&uptime=0&rows=100&port=8080
>
> On Mon, Dec 17, 2018 at 10:30 AM Mac A. Cody <maccody at att.net 
> <mailto:maccody at att.net>> wrote:
>
>     I'm sure that this is being considered, but I'll extend the
>     thought anyway:
>     If there has been a collision that may have damaged or sheared off the
>     RX antenna, could other damage have occurred that might be
>     identifiable
>     via telemetry?  What I'm thinking of is possible damage to one or more
>     solar cells.  Would damage, perhaps resulting is reduced current flow
>     or voltage levels, be discernible through the telemetry?  Are
>     there other
>     items of the surface of AO-95 that, if damaged, might reveal that
>     damage
>     through telemetry.
>
>     Thanks to all the volunteers that have worked so hard to make the FOX
>     series an outstanding success!
>
>     73,
>
>     Mac Cody / AE5PH
>
>
>     On 12/16/18 10:48 PM, Jerry Buxton wrote:
>     > Hi Francis,
>     >
>     > That is one thing we are looking into, handily I am well
>     acquainted with
>     > the ExseedSat team lead and since we were in the deployer next
>     to each
>     > other and performing the integration together we have discussed the
>     > possibility that we got to be too close friends somehow and are
>     still
>     > that way or perhaps remained too close even to the point of antenna
>     > deploy and perhaps interfered with each other's deploy. TLE
>     indicated
>     > separation is perhaps the only way to guesstimate that though. 
>     If it
>     > gives us something to maybe model or relate to past missions, we
>     might
>     > be able to infer that a possible cause was that we may have been
>     close
>     > for a while up to and including our antenna deploy times and
>     something
>     > may have happened as a result of that.  It would at least
>     provide one
>     > possible path to follow in looking for causes and maybe (and I mean
>     > MAYBE) a solution.
>     > Keep on watching for clues, thanks!
>     >
>     > Jerry Buxton, NØJY
>     >
>     > On 12/16/2018 15:30, Francis Geraci wrote:
>     >> First off, I do not want to "2nd guess" the Engineering team.
>     >>
>     >> JUst read the "post" that AO-95 was still very close to another
>     "object".
>     >>
>     >> I just was wondering,  if AO-95 is TOO close to another
>     "object", maybe
>     >> "object" is "blocking" the RX antenna, or did RX antenna get
>     "knocked" off ?
>     >>
>     >> Opinions ?  Everybody has them. HiHi
>     >>
>     >> Francis - W1FXX
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>     _______________________________________________
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>     Opinions expressed
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>     views of AMSAT-NA.
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>
>
> -- 
> Stephen Nipper
> Boise, Idaho
> N7DJX
>
>