[amsat-bb] Re: AO-51 Down??

Alan Cresswell alancresswell at xtra.co.nz
Tue Jun 15 18:52:23 PDT 2010

Hi Drew,

Well the southern hemisphere is a big place and I can assure you there is no
operation in eclipse from VK/ZL.  I monitor almost all evening passes here
which occur shortly after the eclipse and on a number of occasions I have
noted that the transponder was on at my AOS.  It also tends to drop out
shortly after AOS so given the length of the timer this would indicate a
turn on somewhat south of ZL.  This would also correspond to the time AO-51
comes out of eclipse.  My first guess would be that sometimes the
transponder is triggered as it comes out of eclipse as there are no stations
south of ZL to trigger it.  There is also continual switching between the
normal and reduced power levels during the evening passes.  I presume this
indicates a marginal condition so perhaps usage down this way should be
limited for a time after eclipse as well to give the batteries time to


-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Andrew Glasbrenner
Sent: Wednesday, 16 June 2010 00:54
To: Rick - WA4NVM
Subject: [amsat-bb] Re: AO-51 Down??

Rick - WA4NVM wrote:
> Hi All,
> I haven't heard the bird the last two orbits.  I double checked the
sked.... no change.
> 73 all,
> Rick WA4NVM
We have been very close to the low battery trip points due to continued 
attempted use in eclipse in the southern hemispere. I'll try to reset 
things first available pass, probably tomorrow AM EDT.

73, Drew KO4MA
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