[RFI] RF shielding using aluminum foil tape-Fabricating Aluminum Foil Enclosures

Pete Smith n4zr at contesting.com
Thu Jan 13 11:03:36 EST 2005

At 10:04 AM 1/13/2005, Tom Rauch wrote:
>In virtually all cases the antenna system, NOT the relays,
>will set the ultimate isolation in a system like you
>propose. My problems here at my house, for example, are
>largely determined by antenna spacing and path loss (and I
>have some antennas 1/2 mile apart).

Boy, is this right, and it's why stubs and/or bandpass filters remain 
essential.  WE9V did a rather neat article in NCJ a while ago in which he 
quantified the available isolation in his station, and all the numbers are 
much less than even moderately careful relay box design will 
deliver.  W2VJN of TopTen Devices has done something similar in his book on 
interstation interference, plus he gives some good ideas on how much is 
enough and how to get there.

73, Pete N4ZR

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