W8JI's excellent website (W8JI.com) provides detail on a 4 square array
made of short verticals (20' in height). I have built the array and can
attest it performs well if properly contructed. My own experience showed
that providing equal current to each element was critical to achieve the
theorectical design pattern. The current balance is a function of element
impedance which, in turn, is controlled in Tom's design by the amount of
resistance inserted (just a simple, carbon resistor) at the base of each
element.
73...Dave
W0FLS
Original Message:
-----------------
From: Paul and Abbi Elliott paab@gte.net
Date: Mon, 20 Sep 2004 20:10:57 -0500
To: topband@contesting.com
Subject: Topband: Phased active anntennas on 160m
Does anybody have any design and/or construction information on a pair
short vertical antennas without tophats or guys (but posibly with
amplification at each antenna) for receiving on 160m? I am looking for a
system that will give me more directivity and less high angle response than
the small loop I am using. I hope to get a pair of antennas that can be
easily moved around my yard (120 x 120 ft) to point in the direction of a
desired DX station. I do not do contests so taking 10 or 15 minutes to
change directions is not too high a price to pay, in a noisy urban
environment, for better reception of a rare DX station.
Any information and comments would be greatly appreciated.
Paul W5DM (in New Mexico)
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