Hi All, Nothing heard from AO-95 but a weak carrier, last batt voltage recieved here had it at 2.9 volts. Battery shorted? charge regulator fail?
Kevin WA7FWF
AO-95 started resetting every orbit a week or 2 ago and has been getting quickly worse. Now it resets several times per orbit and does not always start up as soon as it hits the sun like it did initially.
If you download the data, you can see that about the time it started resetting, the battery voltage took a sharp drop. My guess is that one of the series battery pairs started holding less and less charge (causing it to reset when it was in eclipse) and then shortly thereafter one of the batteries in the pair shorted, bringing the maximum voltage down. It may be that the other two (pairs) are ok.
It is interesting that you heard a carrier with nothing else. If it is operating at all, I would expect 5 seconds of telemetry alone and then 5 seconds of voice ID with telemetry under it.
73,
Burns WB1FJ AMSAT Fox-1 Software Lead
On Tue, Dec 13, 2022 at 12:31 AM Greg D ko6th.greg@gmail.com wrote:
Yeah, I was wondering the same.? Last telemetry frame received here was on 11/24, but showed the battery at 3.64v (3.10 min).? Odd readings were for the CPU temp which showed 50.5C.? A little toasty, unless that's the junction temp of the chip itself.
Any newer status?
Greg? KO6TH
Kevin Schuchmann via AMSAT-BB wrote:
Hi All, ? Nothing heard from AO-95 but a weak carrier, last batt voltage recieved here had it at 2.9 volts.? Battery shorted? charge regulator fail?
Kevin WA7FWF
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Thanks Burns,
I knew there were issues, but the carrier only was something new which I why I reached out. It appeared at the correct time for AOS, increased in signal strength at TCA and was gone at LOS so I am pretty confident it was AO-95.
My last pass it never woke up, we shall see how long it is before it is permanently silent.
73 Kevin
------- Original Message ------- On Tuesday, December 13th, 2022 at 11:22 AM, Burns Fisher wb1fj-bb@fisher.cc wrote:
AO-95 started resetting every orbit a week or 2 ago and has been getting quickly worse. Now it resets several times per orbit and does not always start up as soon as it hits the sun like it did initially.
If you download the data, you can see that about the time it started resetting, the battery voltage took a sharp drop. My guess is that one of the series battery pairs started holding less and less charge (causing it to reset when it was in eclipse) and then shortly thereafter one of the batteries in the pair shorted, bringing the maximum voltage down. It may be that the other two (pairs) are ok.
It is interesting that you heard a carrier with nothing else. If it is operating at all, I would expect 5 seconds of telemetry alone and then 5 seconds of voice ID with telemetry under it.
73,
Burns WB1FJ AMSAT Fox-1 Software Lead
participants (3)
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Burns Fisher -
Greg D -
Kevin Schuchmann