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Re: Topband: Loss comparison between two antennas

To: <topband@contesting.com>
Subject: Re: Topband: Loss comparison between two antennas
From: "Steve Flood" <kk7uv@bresnan.net>
Date: Sun, 8 Jul 2012 19:59:38 -0600
List-post: <topband@contesting.com">mailto:topband@contesting.com>
>>>What are you connecting the coax shield to?  Describe the counterpoles
for your two antennas in detail.

Both antennas were built over the same radial system, just at different
times.  (see my original message).

I have 60 + radials of 14awg aluminum high-tensile electric fence wire.
They vary from 50 to 120 feet long and are buried an inch or two in acidic
pine forest mineral soil.  Ground quality/conductivity is probably quite
poor since it is very rocky.

The inner ends of the radials connect to a 10 x 10 inch, 0.1" thick
aluminum plate.  Each radial wire is wrapped twice around a sheet metal
screw and then the screw is tighten into the plate.

The L-network is enclosed in a large plastic box 6 inches above the radial
plate.   The coax connection is a standard panel-mount SO-239 with a wide
copper strap six inches long connecting the SO-239 'shield' to the aluminum
plate with a 1/4" st,.steel bolt and 1 inch fender washers - all dissimilar
metals treated with Penetrox.

Steve, KK7UV


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