[Top] [All Lists]

[TowerTalk] Vertical "dipoles"

To: "Towertalk" <>
Subject: [TowerTalk] Vertical "dipoles"
From: "Jim Jarvis" <>
Date: Sun, 15 Feb 2004 19:36:44 -0000
List-post: <>
Jim Reid wrote:

>I suppose if you were  able to get the lower end of the dipole 
>well above even 1/4 wave length in height,  you would be better off,
> but at WWVH it was far more economical to use the
> ground radials to terminate the high E fields from the
> lower ends of those down sloping fanned radials
> (which,  by the way,  provide the shielding for the
> coax feed which goes up the center of the lower
> portion of the supporting tower structure).

We're in violent agreement.  IF you can control the environment
within 2 wavelengths of the antenna, you can work miracles.
If you cannot, you do what you can.

Clearly, radials under the half wave, center fed vertical will 
improve its efficiency.   But get the low end of the radials high
enough, and it's not a material issue.

See Jim's .jpg.  VERY helpful.

Jim Jarvis 


See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>
  • [TowerTalk] Vertical "dipoles", Jim Jarvis <=