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Re: [TowerTalk] 80 Meter yagi question

To: Jim Thomson <jim.thom@telus.net>, towertalk@contesting.com
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
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