[amsat-bb] AO-85 reboots

Patrick STODDARD (WD9EWK/VA7EWK) amsat-bb at wd9ewk.net
Sat Nov 28 03:34:29 UTC 2015


I was working the AO-85 pass this afternoon where you heard the multiple
resets. While I was using my TH-D72A HT and Elk log periodic to make some
QSOs, I was making an RF recording with my SDRplay SDR receiver, HDSDR, and
the AMSAT-UK VHF crossed dipole. I have uploaded the telemetry I received
from that pass to the AMSAT server, and have posted files related to that
pass (MP3 with audio I recorded from the HT, big WAV file with the RF
recording from HDSDR, and other files) to my Dropbox space at:


(Look for the folder "20151127-AO85_Fox1A-DM43").

I observed what appears to be a bunch of resets from about halfway into the
pass until my LOS. Here's what I was seeing (times are UTC, and I sync'd
the tablet's clock with a time server a few minutes before this pass):

22:31:40 - Telemetry off
22:32:09 - Telemetry on
22:32:37 - Telemetry off
22:33:07 - Telemetry on
22:33:17 - Telemetry off
22:33:45 - Telemetry on
22:34:00 - Telemetry off
22:34:20 - Telemetry on
22:34:29 - Telemetry off
22:35:00 - Downlink on after long pause, telemetry off
22:35:28 - Downlink on, telemetry off
22:35:49 - Telemetry on
22:35:58 - Telemetry off
22:36:21 - Telemetry on
22:36:27 - Telemetry off
22:36:52 - Telemetry on
22:36:58 - Telemetry off
22:37:21 - Telemetry on
22:37:27 - Telemetry off
22:37:50 - Telemetry on
22:37:56 - Telemetry off, and I didn't see it switch on again before my LOS

I worked the next pass after this one, around 0008-0019 UTC. I don't recall
seeing anything that looked like telemetry coming from the satellite, and
had a harder time getting through the repeater - even at 50 watts. I will
upload the audio (MP3) and RF (big WAV) recordings to my Dropbox space, in
a folder "20151128-AO85_Fox1A-DM43".


Twitter: @WD9EWK

On Sat, Nov 28, 2015 at 1:25 AM, Andrew Glasbrenner <
glasbrenner at mindspring.com> wrote:

> Earlier this evening I listened to a pass of AO-85 about 2235UTC and the
> was rebooting repeatedly. You can tell when this happens by the short tone
> it emits, just before it drops to carrier operated relay (COR) mode. If
> this
> hasn't cleared on its own by the next passes in the early AM over the East
> Coast, we'll try to reset it by command. In the meantime, any reports or
> telemetry submitted would be wonderful.
> 73, Drew KO4MA
> AMSAT-VP Operations

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