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RE: AO-40 Reception



Jess, AO-40 was just fine today.  I listened from MA230 - MA253.  Got 140 or
so telem packets and 30 or so that were good.

I was listening to it out at 42K KM at MA230.

Doppler and setup today were just fine, it didn't get very loud until MA250,
then is was S9 at least with a few S9+

Just thought I'd let you know.  I hosted live audio from it and live
telemetry via p3t and the goddard server.

Alan

-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of Jesse Morris
Sent: Sunday, April 01, 2001 6:27 PM
To: amsat-bb@AMSAT.Org
Subject: [amsat-bb] AO-40 Reception


Good Evening to all,

I heard zip out of AO-40 today and I'm not sure why.  I don't think it
was my receive setup because I heard both UO-11 and AO-16 this weekend
for the first time and the AO-16 reception was just a couple of hours
before I tried AO-40.  Maybe I got a bad set of keps but the pass seemed
reasonable - I listened from 1715Z (MA240) until the IT predicted LOS of
1814Z (MA253) but I did not hear a peep.

Incidentally, since I put the Drake converter on the mast I have been
getting some of the impulse type noise that has previously been described
here.  I first thought it was interference but I now believe it is
internally generated.  In my case however, I am using a grounded feed
helix and I have a SM inductor across the input connector of the
converter. The noise is not continuous but seems to come and go.  It
appears to be somewhat related to the elevation drive but I can't connect
it with movement.  It sounds like static type impulse noise but the noise
blanker does nothing to it so it must have a wide pulse width.  Sounds
somewhat like rain static but the weather has been clear when I have
heard it.  I'm thinking in terms of running a ground wire from the
antenna/converter to the rotor and mast and see what that does.  I'll
keep you posted.

Hope lots of people heard the signal and I just made some sort of stupid
mistake.  Windows 95 (bless it's heart) did adjust the GMT time on my
computer for daylight savings but I got that fixed before the pass.

I have not completely mastered the IT ALON/ALAT concept.  I assume that
since ALAT is currently zero there isn't any reason to change the sign of
zero!  I added 180 to 170 and used 0/350 as the input for IT.  Of course
that wont make any difference in actually hearing the satellite.


73 de Jess - W4MVB
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