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Re: [TowerTalk] 40-30m dipole design

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 40-30m dipole design
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Thu, 17 Mar 2016 12:40:36 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Thu,3/17/2016 12:14 PM, jimlux wrote:
There's no big advantage to linear loading: you might as well use a good low loss inductor at the feed (the "shorty 40" does this).

Are you certain about this, Jim? Both change the current distribution, but linear loading changes it least at the center, where current is greatest. The inductor places maximum current in the inductor, which doesn't radiate. NEC doesn't model that very well, treating the inductor as a lumped element, with no change in the current distribution across it. NEC probably would model linear loading pretty well if the model accurately described the antenna.

73, Jim K9YC



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