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 dimensionsof 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 squareplates. Jack - n7oo _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk_______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk |
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