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Re: [TowerTalk] 160 and 80 verticals

Subject: Re: [TowerTalk] 160 and 80 verticals
From: "Cecil Moore" <>
Date: Fri, 08 Dec 2006 06:45:02 -0600
List-post: <>
>From: "Tom Osborne" <>
>I just put up some more antennas (you can never have too many).  Can I use
>the same ground radial system for 2 verticals?  I want to tie off an
>inverted 'L' for 160 and an 80 meter vertical at the same spot.  Will it
>hurt anything to feed them separately and use the same radial system?

The thing that one has to do is to ensure that the unused antenna system
is not resonant by accident. With one feedline disconnected and floating
what you might wind up with is a open stub that resonates one antenna
system to your other operating frequency. Shorting out the feedline is also
no guarantee that it is not resonant. I would use a GDO to determine where
the open-circuit and short-circuit resonances are located for each system.
Common-mode resonances might also be a problem that chokes would
probably solve.
73, Cecil,

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