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Re: Topband: Using 4 - 6 elevated radials in lieu of 120 buried wires

To: "Radio KH6O" <radio.kh6o@gmail.com>
Subject: Re: Topband: Using 4 - 6 elevated radials in lieu of 120 buried wires
From: "Robin" <wb6tza@socal.rr.com>
Reply-to: Robin <wb6tza@socal.rr.com>
Date: Thu, 4 Jan 2024 21:53:33 -0800
List-post: <mailto:topband@contesting.com>
Milt Jensen, N5IA (SK) constructed his original (circa 1990s) 160M station TX antenna based on a similar design I encouraged him use. He built a 180 ft tower with an insulator at 50 ft, Four elevated quarter wave radials, each made of a box of four pieces of # 12. This was on his "city" lot where buried radials were impossible

It worked very well, We did not have the tools to make real field strength measurements to compare to a model, but on air performance was excellent

It worked well enough for him to use the concept in several similar installations and to make his 8 circle array

The radial height above ground clearly did not need to be 50 feet,. It did need to be high enough to easily be well above a tall truck, or more commonly, a horseback rider.

We used a single element elevated radial 160M TX antenna, and for the 80M 4 square at XZ0A with considerable success.

The concept of exciting a tower from the inside is very interesting. The reposting this article a has me thinking about one situation I have available to me that can not have a complex installation outside the general dimensions of the tower (large but not tall)

One thing to bear in mind throughout any analysis of such designs for 160M is that the total focus of the Broadcast designs and measurements and proofs is energy at zero degrees elevation. Our needs benefit from low angle radiation, for certain, but, little attention is paid by the broadcasters and by the modeling programs to position and shape of elevated lobes, or for that matter, the shape of the main lobe above zero elevation

Robin Critchell, WA6CDR



----- Original Message ----- From: "Ken WA8JXM" <wa8jxm@gmail.com>
To: "Radio KH6O" <radio.kh6o@gmail.com>
Cc: "topband" <topband@contesting.com>
Sent: Thursday, January 04, 2024 20:56
Subject: Re: Topband: Using 4 - 6 elevated radials in lieu of 120 buried wires


Very interesting, thanks for sharing.

I have seen similar information in one of the ARRL manuals, that elevated,
insulated radials are more efficient than the typical ham buried 30 or 40
radials  Perhaps that originated from the information you posted.

Is it okay if I post your information to a ham antennas group?

Ken WA8JXM

On Thu, Jan 4, 2024 at 9:58 PM Radio KH6O <radio.kh6o@gmail.com> wrote:

Attached is an interesting research paper by Clarence Beverage.

--
73,
Jeff KH6O
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