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

[Grant Saviers <grants2@pacbell.net>]

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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