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Re: Topband: tower vertical

Subject: Re: Topband: tower vertical
From: Brian Pease <>
Date: Tue, 31 Jan 2017 08:20:23 -0500
List-post: <">>
The base insulator is certainly the most effective way to detune, and the most efficient way to drive the tower, but it is nice to have the tower grounded and use shunt feed. You can detune the tower by turning the bottom section into a parallel-resonant trap during receive, probably using the TX shunt wire with a series capacitor to the bottom. See ON4UNs book pg 7-109

On 1/31/2017 12:49 AM, Bob Kupps via Topband wrote:
Hi I have decided to put up a 40m tower to use as a transmitting vertical for 1.8mHz 
out away from in between our other towers and where I can run 1/4 wave radials all 
the way around, and will probably use locally available 12" steel sections with 
a conical-type pin base. I would like to insulate the base in order to make it 
easier to detune on receive (this will be located in the exact center of our 8 
circle rx arrays). Has anyone used HDPE or similar to make a homebrew base insulator 
for a tower monopole? Any other comments about the need for a base insulator also 
73 Bob HS0ZIA

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