I had a similar issue with my 20m boom being resonant on 40m. In my case I
made it so the antennas could not be turned separately.
For for a fixed wire beam I think that the easiest solution would be to
use a fiberglass boom.
John KK9A
To: towertalk@contesting.com
Subject: [TowerTalk] Breaking boom resonance
From: Steve London <n2icarrl@gmail.com>
Reply-to: n2ic@arrl.net
Date: Tue, 28 Mar 2017 09:57:35 -0600
I have a 34 foot boom supporting an 80 meter wire beam. The elements of
the wire beam are completely insulated from the boom. 30 feet below that
boom is a 20 meter beam. Yes, there is definitely interaction.
I am looking at techniques for detuning the boom using the W8JI tower
detuning method. Anyone want to make a guess at how long the detuning
section should be, and what value of capacitor would get me in the
ballpark for resonance at 14 MHz ?
73,
Steve, N2IC
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