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Re: [TowerTalk] 80M antenna wire size

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 80M antenna wire size
From: Wes <wes_n7ws@triconet.org>
Date: Fri, 3 Jan 2020 07:36:39 -0700
List-post: <mailto:towertalk@contesting.com>
This can be modeled in EZNEC to remove some of the assumptions.  A/B test with copper then steel for the material.

Wes  N7WS

On 1/3/2020 6:36 AM, jimlux wrote:
On 1/2/20 11:28 PM, David Gilbert wrote:

I'm using #18 solid Copperweld wire from Davis RF for my 160m Inverted-L antenna.  It tarnished quickly to a dark brown and is virtually invisible.  I'm not even sure I could spot it up in the air if it didn't have some dacron line holding it up to tell me where it is.  The DC resistance is negligible ... something like 0.05 ohms per meter, I think.

A 40 meter length at 0.05 ohm/meter is 2 ohms. On a vertical (which is what an inverted L is), with feedpoint impedance of 35 ohms, 2 ohms is about 6%, or a 0.3 dB loss? (huge assumptions here about uniform current distribution, AC resistance = DC resistance, etc.)




It's amazingly strong, too.

73,
Dave   AB7E

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