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[RFI] RFI into alpha amplifier

To: <rfi@contesting.com>
Subject: [RFI] RFI into alpha amplifier
From: Herb Rosenberg <herbr@netcom.com> (Herb Rosenberg)
Date: Fri, 22 Oct 1999 11:52:57 -0700 (PDT)

I have a two radio station with multiple antennas, and and alpha87a, and 
an alpha 89a.  For some reason, I am getting RF into the 89, which is in 
the second operating postion, when I transmit from the other operating 
position on certain antennas.  This RF, appears as a buzzing sound from 
inside the amp, and is only occurs if that amp is in the operate 
position. If I place the amp in standby, this doesn't happen.  This stray 
rf also trips the external swr meter connected to the amp.  It seems like 
this has just started to happen, so I know somethign has changed, but I 
can't find it.  I tore about and redid halp the station in an effort to 
find the problem, with no luck.

I have a extensive ground system for all equipment in the shack, with all 
equipment tied to a common ground, and then immediately going outside to 
the earth ground.  My station setup is fairly complex with dunestar 
bandpass filters, top ten devices, polyphaser lighning and NEMA boxes 
with copper panels to mount most of this stuff in.  

Any help or suggestions would be appreciated.



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