N6BV has postulated that elevated radials need to be 0.05 WL
(wavelengths) or more above ground for good efficiency. That
corresponds to 7 ft on 40M, 14 ft on 80M, 28 ft on 160M.
My 80M elevated GP with 10 radials at 15 ft feels very competitive.
My 160M elevated GP (135 ft of R25) with 6 elevated radials at 15M
feels less competitive but still works most DX eventually (XZ, ZD9, JA
etc.)
I have heard reports of people using only 2 radials but I expect
that "more is better". For ground mounted radials or elevated
radials less than 0.05 WL high, 30 or more provide good efficiency.
de Tom N4KG ( CW is FUN-damental ! )
On Wed, 7 Feb 2001 "Nat Heatwole" <heatwole@clark.net> writes:
> I've search the Internet as well as ON4UN's book very thoroughly,
> however I
> have not found a conclusive answer to the question of how many
> raised
> radials to use on a lowband vertical antenna. So, I turn to the
> group. What
> would be the best practical number of elevated radials to use on a
> lowband
> (40-160m) vertical antenna that would be mounted between ground
> level and
> 15ft for optimum DX performance? I have heard of many using 2, 4, 8,
> and 32
> very successfully, but is there a better, yet still practical,
> number?
>
> 73, Nat, WZ3AR
> <heatwole@clark.net>
> Damascus, Maryland
>
>
> --
> FAQ on WWW: http://www.contesting.com/FAQ/towertalk
> Submissions: towertalk@contesting.com
> Administrative requests: towertalk-REQUEST@contesting.com
> Problems: owner-towertalk@contesting.com
>
CW is FUN-damental
________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today! For your FREE software, visit:
http://dl.www.juno.com/get/tagj.
--
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
|