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[AMPS] tvi.

To: <>
Subject: [AMPS] tvi.
From: (2)
Date: Mon, 2 Jul 2001 06:20:57 -0700
>I agree with Phil's comments about the electrical stuff.
>Also, tell him to call up Amidon and order their FT-240-77 torroids (I
>believe the 240 is the largest if I remember correctly).  Get a torroid for
>each cord.  Wind as many turns as possible around the torroid next to
>wherever the cord goes in.  If it's the TV, put a torroid on the coax and a
>torroid on the power cord.  He needs to put these on every set or dss rx,
>That will most definitely clear things up for him.

/\  This will prevent fundamental RF from entering the TV set, however, 
it most definitely did not cure my TVI problem.  I found the problem by 
sending a series of 7MHz, 1400w dits with a keyer, and sniffing around 
outside with a hand-held VHF receiver.  I discovered that the joints in 
the metal rain gutters were acting like varactor diodes and generating 
harmonics of 7MHz well into the VHF region.   The cure was to 
silver-solder copper ribbons across the joints in the rain gutters. 


-  R. L. Measures, 805.386.3734,AG6K,  

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