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
|