[aprssig] Re: aprssig Digest, Vol 17, Issue 31

[Robert Bruninga]

PCsat has no CPU.
It is only two KPC-9612 dual port
TNC's, so the problem is the
factorry defaults we put in before
launch.  We thought it was important
to have spare Receivers come on
in case it lost contact with the ground.

Problem is, if that loss is due to low
power shut down, then it comes back
up with too much drain and cannot 
climb out of that discharge hole until
we get good sun....  every few months.

Bob


>>> agcme2002 at yahoo.com 11/29/05 5:12 PM >>>
Here's a silly question:  are you not able to update
the code on your system control computer such that the
default state for the two problematic UHF transponders
is off rather than on?

I'm sure you already considered it but I thought I'd
ask because I'm very curious.

-Alex, KF4LVZ


Date: Tue, 29 Nov 2005 12:38:37 -0500
From: "Robert Bruninga" <bruninga at usna.edu>
Subject: [aprssig] Fwd: PCsat 50% through full Sun
period
To: <aprssig at lists.tapr.org>
Message-ID: <s38c4bd3.086 at FSGWHUB.usna.edu>
Content-Type: text/plain; charset=US-ASCII

Today, 29 Nov,  PCsat is 50% (6 days) through 
its 12 day full-sun period.  In fact, today, PCsat's
orbit flies almost perfectly over the day/night
line so you you get about equal passes in the
hour before and after sun rise and sunset.

On http://pcsat.aprs.org,  I notice about 45 users 
today, and about 72 different calls in the last
2 days.  

In 6 days, when PCsat returns to eclipses, 
we are usually lucky enough to keep
her from resetting for a few more weeks and
at least daylight operations can continue
normally.  But once it resets, either due to
peak user load  or an SEU, then we lose her
again until the next full sun period in the
first week of March 2006.

PCSAT2 should come back to life on the 1st 
of Dec and so we should get some time for
joint dual-hop experiments.

Bob Bruninga, WB4APR
US Naval Academy Satellite Lab


		
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