Towertalk
[Top] [All Lists]

Re: [TowerTalk] Topband: Radials on ground v FCP

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Topband: Radials on ground v FCP
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Tue, 11 Jan 2022 23:28:40 -0800
List-post: <mailto:towertalk@contesting.com>
On 1/11/2022 1:15 PM, Lux, Jim wrote:
N6BT, who has done a LOT of work on the topic of elevated radials, told me that 20 ft is a minimum height for 160M. When I raised mine from about 6 ft to that height, TX signal improved significantly.


But what is the *reason* for it working better.  Is it something as simple as "the currents in the radials aren't loaded as heavily by something 20 feet away as opposed to 6 feet away" in which case it's a sort of soft transition, and "going higher" is a matter of diminishing returns.

Loss coupled from the earth under them, and, as Rudy observed in the study below referenced by Wes, unequal current distribution between them. I suspect differences between his advice and Rudy's with respect to height are the result of differences in soil conductivity. Mine is poor.

On 1/11/2022 1:55 PM, Wes wrote:
> Additionally see: "A Closer Look at Vertical Antennas With Elevated
> Ground Systems" by Rudy Severns N6LF.  He recommends 10-12 elevated
> radials as a minimum.

Yes, and for very good reasons. In my dense woods, it's tough enough keeping four in the air, what with stuff falling on them every few months. And at 80, I don't get around as well as I used to. :)

73, Jim K9YC
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
<Prev in Thread] Current Thread [Next in Thread>