To: | Jim Thomson <jim.thom@telus.net>, towertalk@contesting.com |
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Subject: | Re: [TowerTalk] 80 Meter yagi question |
From: | "Richard (Rick) Karlquist" <richard@karlquist.com> |
Date: | Wed, 11 Oct 2017 17:10:04 -0700 |
List-post: | <mailto:towertalk@contesting.com> |
On 10/11/2017 10:11 AM, Jim Thomson wrote: ## Aluminum only conducts 60% as good as copper. .25 inch OD copper = .417 inch OD aluminum. Jim VE7RF That is only true at frequencies below which skin effect is significant. For RF frequencies, you need to take the square root of 60% which comes out to 77%. 1/4 inch copper = 5/16 inch aluminum. Rick N6RK _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk |
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