--- In [email protected], Frank or Barb <[EMAIL PROTECTED]>
wrote:
> Unless you can line up the radiating elements vertically, all your
> antennas will be out of phase with other to any other direction.
> Some RX signal will go by the first antenna and hit the 2nd 3rd and
4th
> antenna out of phase with the 1st antenna. The end result is that
the
> out of phase signals will lower the total RX signal.
> Same thing happens on TX.
That's true.
> Easiest thing to do is a folded dipole array, arrange the dipoles
for
> major lobes to the areas you want.
> Thats my two cents
> N3FLR - Frank
>
Can't argue with that, but the *lobes* are super-broad. I think
Mathew's idea is to basically replace the dipoles with beams, aimed
at areas of interest. You probably cannot use the phasing harness
from a DB224-type antenna, but using a power splitter properly would
be the way to go. Sure, the pattern would be nowhere near circular,
expecially with 10 element beams, that's not the idea, but it should
work very well in the direction(s) of interest.
Seems this idea has been put into use on the shore of a body of water
where little/no coverage is desired on water. Gives you MUCH tighter
control over the azimuth pattern than just using a DB224 with the
dipoles lined up on one side of the mast.
And my <.02> worth....
Laryn K8TVZ
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