[amsat-bb] Re: ARISSat-1
fjamesa at telstra.com
Sat Aug 27 07:07:31 PDT 2011
I found this morning in VK6 (approx. 03:45 UTC) the MET counter said
21min 45 sec, which is approx. the time ARISSat-1 would have come back
into Sunlight. Strange thing is it was on High Power - got plenty of
telemetry frames but was discharging at a great rate of knots.. Looking
at the data it would seem there was more discharging than charging going
on over it's first 21 minutes. 1 panel said 45v, the others were around
15v so the part that was facing direct sunlight was good. I will get
another chance perhaps in a few hours to see if it's still alive when
not in sunlight and will try to grab some more telemetry.
I have a jpg screenshot of telemetry with the position info from earlier
if anyone would like it.
On 27/08/2011 7:33 PM, Pete MI0VAX wrote:
> Hi Carl,
> I've seen this recently myself too.. On the occasions when it happened here
> over the UK, the bird "should" have been in high power mode, but after
> looking at telemetry it appears that it had switched into low power mode
> much earlier that than usual, from memory the footprint was only half in
> eclipse. Also noticed that before it cuts off that there is usually 10-15 or
> so seconds of a silent carrier. On another occasion it cut out halfway
> through a SSTV transmission - this I'm almost certain shouldn't have
> happened due to the way the firmware was written.
> Perhaps a bad solar panel contributing to low voltage when approaching
> eclipse? I had noticed one of the panel temps was over 75c on several
> It certainly looks like there is some intermittent problems beginning to
> raise their head, lets hope it's not a steady decline in the bird's
> performance as gathering the SSTV pics, telemetry etc has been a very
> enjoyable change to the usual FM/SSB activity.
> 73 de Pete
> On Sat, Aug 27, 2011 at 3:59 AM, Carl Rimmer<cfrimmer at gmail.com> wrote:
>> I was having a really good pass gpong from my NW-SE and I had copied 6
>> frames of Telemetry and 5 frames of KURSK data when the bird just went
>> silent. It never came back during this pass. It was the 08-27-2011 0241
>> UTC pass over Lake Erie. I am curious if anyone has heard it since than.
>> That is probably the best I have copied it since day one. The frames
>> forwarded. The MET was 55' 33". Bat Voltage = 35.668; Bat Current = -16
>> ma. I've never heard it just go silent like that and not come back up.
>> Carl W8KRF
>> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
More information about the AMSAT-BB