[TowerTalk] dipole feed seperation

[Michael Tope]

Hi Ted,

If you consider that in terms of wavelength a 20" insulator at 1.8 MHz is
equivalent to a 2" insulator at 18 MHz, and that in either case you are
talking about 0.003 wavelengths,  I suspect that you don't have
anything to worry about. I wouldn't give it second thought. 

BTW, I believe Jim is correct that this will add approximately 20" to the
length of the antenna depending on the taper of the feed wires (a very
gradual taper might add less, but I don't know for sure).

73 de Mike, W4EF 

----- Original Message ----- 
From: "James White" <k4oj@tampabay.rr.com>
To: "Ted Leaf" <tleaf@hotmail.com>; <towertalk@contesting.com>
Sent: Sunday, December 24, 2000 6:14 AM
Subject: Re: [TowerTalk] dipole feed seperation


> I am far from an EE but I believe that by having that wider separation you
> essentially lengthen the antenna as that part of the feed acts like the
> radiator as opposed to the feed line.
> 
> Melikalikimaka (or however you spell it!)
> 
> Jim, K4OJ
> 
> ----- Original Message -----
> From: "Ted Leaf" <tleaf@hotmail.com>
> To: <towertalk@contesting.com>
> Sent: Sunday, December 24, 2000 7:03 AM
> Subject: [TowerTalk] dipole feed seperation
> 
> 
> > Happy Holidays Guys,
> >
> > I am planning to put up a dipole for 160M for local communication (height
> is
> > not an issue).
> >
> > Because of my situation, I'm using special wire clamps attached to each
> end
> > of the center insulator at the feed point.  The beginnings of horizontal
> > legs may be separated by as much as 20 inches.
> >
> > Is a 20" center separation too great?
> >
> > I have never seen what the ideal separation is and just assumed that most
> > "dog bone" insulators had the proper distance of about 1-2".
> >
> > 73, Aloha
> > Ted Leaf, K6HI
> > Kona, Hawaii
> > <tleaf@hotmail.com>
> >
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