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Re: [TowerTalk] Field Strength comparison

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Field Strength comparison
From: "Lux, Jim" <jim@luxfamily.com>
Date: Sat, 4 Sep 2021 15:58:23 -0700
List-post: <mailto:towertalk@contesting.com>
On 9/4/21 3:36 PM, Stan Stockton wrote:
How far away (minimum) should a receive antenna be located if you wanted to accurately 
measure the difference between a couple of vertical arrays - let’s say, for 
example a 4 Square and a single vertical.

Thanks… Stan, K5GO

The traditional guide line for antenna ranges is 2 D^2/lambda, where D is the diameter of the antenna.  That has to do with the phase difference from a plane wave being small enough that the gain isn't significantly wrong (I can't remember if it's 0.1 dB or what, and I'm too lazy to calculate it now).

For a 80 m foursquare, it's roughly 30 meters across (1.414 * 20m) so 2 * 900/80 = 180 meters away



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