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Re: [TowerTalk] Open wire transmission line

To: "Steve" <steveac@charter.net>,"TowerTalk" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Open wire transmission line
From: "Tom Rauch" <w8ji@contesting.com>
Reply-to: Tom Rauch <w8ji@contesting.com>
Date: Thu, 22 Sep 2005 04:40:50 -0400
List-post: <mailto:towertalk@contesting.com>
> I have a 1/8 inch thick sheet of Lexan that I could cut
into into strips
> for use as spacers. Perhaps an inch wide and long enough
to space the
> wires at five or six inches.

For many many years I've cut Lexan strips ~1/4 inch wide as
open wire line spacers.

You can run into problems if the load impedance is very high
at high power. On humid mornings I've had 3 inch lexan
spacers on a line feeding two half waves in phase fail near
the antenna feedpoint.

I had a 1500 foot long open wire line made from number 8
wire spaced 2.75 inches (450 ohm).
I used lexan spacers on that line also.


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