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Re: [TowerTalk] [Bulk] Re: Flat plate compensation

To: Jack Taylor <jack@n7oo.com>, towertalk@contesting.com
Subject: Re: [TowerTalk] [Bulk] Re: Flat plate compensation
From: Grant Saviers <grants2@pacbell.net>
Date: Fri, 13 Mar 2015 13:42:08 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Lawson "Yagi Antenna Design" page 7-12 computes the equivalent radius of a boom to element plate as =width/4. So if you make the center element as long as the plate and width/2 diameter, the modeling should be close. He also states "element length should be increased 6 percent of boom diameter" when they are electrically connected. Both are pretty small effects for HF antennas, but if you are doing modeling, why not include it?

Grant KZ1W

On 3/13/2015 12:50 PM, Jack Taylor wrote:
Electrical. Years ago I recall in an old text mention made of yagi element lengths needing to take in account the physical dimensions
of the boom to element mount.

Jack - n7oo

-----Original Message----- From: Pete Smith N4ZR
Sent: Friday, March 13, 2015 2:59 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Flat plate compensation

Electrical or wind-loading?

73, Pete N4ZR

On 3/11/2015 10:55 PM, Jack Taylor wrote:
Is there a rule of thumb compensation for boom to element flat plate configuration? I'm using an inch and a half boom for a 17 meter three element yagi using eight inch square
plates.

Jack - n7oo
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