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Re: [TowerTalk] 40 meter dipole

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 40 meter dipole
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 2 Oct 2023 10:06:09 -0700
List-post: <mailto:towertalk@contesting.com>
On 10/2/2023 3:59 AM, J. Hunt via TowerTalk wrote:
The performance of an antenna will depend on the overall element size (length).
Shorter elements will have a narrower usable SWR bandwidth.
Yes, but extensive modeling shows that SWR bandwidth is the only 
important downside of loading that is not inductors at the feedpoint.
SWR is NOT a measure of antenna performance, and the added loss due to 
SWR values below 3:1 at the feedpoint are too small to matter unless 
you're using line smaller than RG8/11, and/or the lines are very long. 
My 80M dipole at 125 ft fed with about 170 ft of a good RG11 presents a 
5:1 SWR on 60M at the TX, but is quite effective running legal limit 
(100W ERP).
73, Jim K9YC


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