[amsat-bb] re: 1.2 GHz amplifier

[Achim Vollhardt <avollhar@xxxxxxxxxxxxxxx>]

Hi Vince,
you are mixing up two things: LEILA and the U-Band AGC.

Leila gives you the siren, when you are exceeding a certain power limit.
Unfortunately (due to radar interference), you will also hear LEILA, where
no signal is present..

the U-Band AGC will decrease RX sensitivity, when a too high power level
is present in the passband.

 As far as I know, those two systems are not linked to each other, so
turning LEILA off will help nothing in term of too high U-BAND AGC.. even
worse: the occasions where LEILA really hits it's design purpose will go
undetected and those stations will even drive up the AGC further..

The difference between U and L-band uplink is the different type of earth
radar interference and the different AGC level settings (which can't be
tuned once the bird is in orbit, as far as I know). That's why it seems to
have  better signals on L-band..

73s from Achim, DH2VA.. currently working on his portable L-Band uplink :)



-----Original Message-----
From: "Gary \"Joe\" Mayfield" <ks5z@AMSAT.Org>
Sent: Jan 9, 2004 5:15 PM
To:
Cc: AMSAT-bb@AMSAT.Org
Subject: Re: [amsat-bb] 1.2ghz amplifier

So the trick is to get on L-Band and avoid Leila?  There seems to be
something wrong with this.

73,
Joe
ks5z


Yes, they should turn Leila off completely.
----
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