Towertalk
[Top] [All Lists]

Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 40m 4el KLM - replacing linear loading with coils
From: jimlux <jimlux@earthlink.net>
Date: Wed, 29 Apr 2020 06:21:54 -0700
List-post: <mailto:towertalk@contesting.com>
On 4/28/20 9:35 PM, Wes wrote:
I agree with Dave.  We had a similar discussion about this (using monopoles) nearly 20 years ago in the rec.radio.amateur.antenna forum. I wrote a little paper at the time; I see it's available at: https://www.qsl.net/n7ws/Loaded_Antennas.pdf ; Of note is my reference #1.

Wes  N7WS



I think, though, that the whole "short vertical" thing (typically in the context of vehicle mounted antennas) is a much more extreme case than a loaded 40m, where the elements are nearly full sized (46 ft vs 66 ft).

The radiation resistance of a 8 foot monopole for 7 MHz is a lot smaller than the loaded 40m yagi element.

Loss resistance is going to be a much bigger factor for something with a 2 ohm radiation resistance than for something with a 20 or 50 ohm Rrad.
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
<Prev in Thread] Current Thread [Next in Thread>