[amsat-bb] Re: ARISSat-1

Pete MI0VAX petemi0vax at gmail.com
Sat Aug 27 04:33:34 PDT 2011

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
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