Hi Ken,
several years ago I saw interesting approach by S53R, who made 80m vertical
split in the middle (at 33' level), with linear loading "coil" (neccessary
length of wire in extended "C" shape) attached to both halves of 80m
vertical, and relay in N/C state shortening linear loading for working on
80m. That stuff worked pretty well on both bands, but required extensive
guying due to "weak point" in the middle of the vertical. Maybe that would
help.
73 de Mirko, S57AD
----- Original Message -----
From: Ken <k3yi@comcast.net>
To: Topband <topband@contesting.com>
Sent: Sunday, July 18, 2004 7:40 PM
Subject: Topband: Switch for 160 meter antenna
> Hello,
>
> I am building a 160 meter vertical antenna, and perhaps incorporate a 80
> meter antenna within the same structure.
>
> I would like to switch out a top section of the of the antenna by means of
a
> switch to break a connection leading to the rest of the above antenna
> circuit.
>
> I could easily do this with a relay, but I don't want to rely on any coil
> failures either due to voltages drop out or weakness of the coil of the
> relay.
>
> What I would like to fine if possible, a type of wiper or knife like
switch
> that can be activated by a servo or similar type mechanical devise.
>
> Does anyone know of such a switch, and where to fine it?
>
> Thank you,
> Ken
> K3YI
>
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