4 SQUARE ORIENTATION de N4KG
The usual configuration employed by most users is to
align their 4 squares along N/S/E/W lines, with the major
lobes aimed NE, SE, SW, NW.
As W8JI points out, the nulls due east and due west
are a bit of a problem with Africa and VK.
More complex switching can be used to obtain
N, S, E, W patterns in addition to the diagonal patterns.
>From the eastern half of the country, there is a simpler
solution: ROTATE the array 15 degrees CLOCKWISE.
This results in main lobes at 60, 150, 240, and 330 degrees
which covers all of Europe, Middle East, Africa, VK/ZL,and
eastern Asia.
The pattern nulls are at 15, 105, 195, and 285 degrees.
>From the Eastern USA, almost nobody lives at those
headings. (OK, you will have to do something else
to have a killer signal into JW, ZS8, CE0X, and P29,
but how often are those places even on the air?
(You already installed a mile of radials and permanent
supports for NE, SE, SW, NW? Too bad. )
de Tom N4KG
............................
On Tue, 30 Jun 1998 12:02:20 +0000 Tom Rauch
<10eesfams2mi@mass1-pop.pmm.mci.net> writes:
>
>snip
>I'm testing antennas in the mornings with VK's and ZL's, comparing a
>dipole (broadside east-west) at 260 feet height with the 4 square
>(110 ft in-line spacing with 120/240 degree phasing) and an omni-
>3/8 wl vertical. The four square points due southwest or northwest,
>and the dipole feedline and the 260 ft tower located 500 feet due
>west of the omni- and 4 square puts a null due wes. This null located
>due west hurts the verticals about 8 dB.
>
>snip
>73, Tom W8JI
>w8ji.tom@MCIONE.com
>
_____________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com
Or call Juno at (800) 654-JUNO [654-5866]
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|