Doug,
I have 3 patterns for you.
First, If you do not want any signal to go N and the signal equal around
to the South then take the dipoles and place them in a 60 degree
orientation. The 2 on the top section should be 180 from each other to the
East and West and the 2 on the bottom should set at a 60 degrees. The 2
lower dipoles should be aligned 30 degrees to the east and West of the South
alignment.
This will give you a fairly good pattern for the area that you want to
cover.
The second pattern that will work is to place the dipoles in a 70 degree
pattern. Using South as the Zero degree alignment, 1 each at 35 degrees to
the East and West and the others at 70 degrees past that. This will leave a
150 degree arc or 75 degrees off North. This will provide a little to the
North but not very much.
The first or second will work very well. If you need a little more to the
south then take the top at 180 degrees and the bottom towards the south at
90 degrees. This will give you a little more gain to the South than to the
East and West.
We had to do this in South Texas to keep a FED signal out of Mexico. The
first is the one we used and it is still in use today.
Charles Miller
- Original Message -
From: n3dab [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, April 08, 2006 1:23 PM
Subject: [Repeater-Builder] Hypothetical dipole antenna question
73 to the Group. Since there is a current discusion ongoing related to
dipole antennas I would appreciate any comments about the hypothetical
situation below:
Asumming a DB224E antenna with 4 dipoles, top mounted on a tower, and a
coverage area that is a 270 degree arc (E,S and W.) from the antenna,
the remaing 90 degree segment (N.) being blocked by nearby and much
higher terrain, what is the best orientation of the dipoles on the mast
to provide the max. coverage to the 270 degree arc. all other things
aside.
All dipoles aligned on one the S.face of the mast.
2 dipoles facing S., 1 facing E. and 1 facing W.
@ facing SSE. and 2 facing SSW.
1 E., 1 SSE., 1 SSW., and 1 W.
or some other arrangement
TIA
Doug N3DAB
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