Re: [amsat-bb] get a clue...

["Lee" <lee-fl@xxxxxxxxxx>]

There are several things which I believe contribute to this problem.

1.  In some cases it is an attempt to compensate for a simple lack of
receive sensitivity.  Stations hearing the excessively strong L-band signals
don't realize how marginal their receive set up is.

2. The L-band rx AGC does not restrict users of this band to the recommended
MB-10db signal level.  As a result some stations attempt to achieve the same
excessive levels using the 70cm uplink resulting in decreased U-Rx
sensitivity.

3.  The U-rx AGC has been driven so high for so long that everyone now
considers it normal to run 4 to 8 times the recommended 100w EIRP.

Take a look at some AO-40 AGC data downloaded from the archive for this
month.
http://home.cfl.rr.com/lmclamb/ao40agc1202.html


Lee-KU4OS

----- Original Message -----
From: "kevin schuchmann" <kschuchm@pacbell.net>
To: <amsat-bb@AMSAT.Org>
Sent: Saturday, December 14, 2002 16:55 PM
Subject: [amsat-bb] get a clue...


> Hi All,
>    could people please get a clue on AO40?  everyone has run too much
power
> at one time or another
> including myself... but I try not to... yet there are stations that are
> always way too loud... pass after pass... I'm talking beacon level here...
>
> GET A CLUE!!! tune down and look at the beacon, I don't care what your
setup
> is... it doesn't matter..
> but look at that beacon... see where it is on your meter??? be under it by
> at least a couple s units....
>
>  and another thing,everyone loves to praise cw, how it can get through
when
> ssb wont cut it.... then how come so many cw stations are beacon level???
> DUH!!!
>
> I'm sure that a lot of people have seen this behavior and have seen the
> results... agc clamping the passband... and splatter and  images on the
> passband....
>
> If you only get the beacon a s unit or two above your noise guess what...
> you need to fix your receive and probably shouldn't be on the sat till you
> fix that....
>
> ok rant mode off... shields up!!
>
> Kevin
> WA6FWF
>
>
>
>
>
>
> ----
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