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Re: Noisy signal this night on AO40 orbit 1288 from MA=162



Hi Dom,

It is an interesting anomaly.  It looks like this has been going on for
awhile but only recently moved into the low squint portion of the orbit
where it is more noticeable.  Likewise the duration has lengthened as you
would expect for a ground based emitter moving through the footprint.
However, the doppler shift seems wrong if the transmit frequency is fixed
which it may not be.

To get that kind of AGC/ALC response would require either a VERY big
transmitter or something very close such as your suspected oscillations.

I've posted a set of charts for the last 5 orbits on my web site.
http://home.cfl.rr.com/lmclamb/ao40L1agc.html

73,
Lee-KU4OS

----- Original Message ----- 
From: "i8cvs" <domenico.i8cvs@tin.it>
To: "AMSAT-BB" <amsat-bb@AMSAT.Org>; "Charles Suckling"
<charles.suckling@ntlworld.com>; "James R. Miller, G3RUH"
<g3ruh@jrmiller.demon.co.uk>; <w4sm@cstone.net>; "Reinhard DJ1KM Richter"
<r.richter@dj1km.de>
Sent: Thursday, August 21, 2003 4:34 AM
Subject: [amsat-bb] Noisy signal this night on AO40 orbit 1288 from MA=162


[snip]

> During orbit 1286 AO40 was in range with only Americas and Pacific
> and no Europe not Africa and not Asia was in range.
>
> For the above reason it seams unrealistic that the L1 signal activating
> the L1 Rx AGC is radiated from the earth and probably some instability
> with autooscillations occurred somewhere in AO40
>
> 73" de
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> i8CVS Domenico
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> ----
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