RE: [amsat-bb] Elevation-dependent Interference

["Gary Gonnella" <gary@xxxxxxxxxxx>]

Is it dependent on Azimuth? or is it the same in all directions?
Gary Gonnella W6RYO 
gary@w6ryo.com
http://www.w6ryo.com
 

> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> Behalf Of Greg D.
> Sent: Thursday, January 30, 2003 12:15 AM
> To: amsat-bb@AMSAT.Org
> Subject: [amsat-bb] Elevation-dependent Interference
> 
> 
> This is wierd.  Do I have defective foliage, or is this
> to be expected?
> 
> I've been having trouble with desense on AO-40.  Transmit
> on 70cm, and the 2.4 ghz noise floor rises so far I can't
> hear anything else.  Found some bad connections and a bad
> set of relay contacts; thought it was fixed.  But earlier
> this week it came back.
> 
> After some experimenting, I find that as the Elevation
> heads towards the horizon, the desense problem rises.  As
> the elevation rises, the problem goes away.  Above about
> 20 degrees, it's essentially gone.  Nice and smooth (not
> due to a bad cable at the rotor).
> 
> Now, this isn't the ground (thermal) noise I'm picking up.
> It's only there on transmit.
> 
> Any ideas why this is happening?  Any fixes?
> 
> Greg  KO6TH
> 
> 
> 
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