[BC] High Gain vs Low Gain Antennas

Craig Bowman craig1 at shianet.org
Sun Feb 22 14:16:02 CST 2009


If this shows anything is that much of the gain expected in the
Horizontal plane is actually going up and down.  This make s a good
argument for fewer bays.  Any energy which should be in the horizontal
plane which is not takes away from the real gain of the array.

Craig Bowman

Richard Fry wrote:
> Below is a link comparing NEC-2 elevation patterns for a 4-bay, 1-wave 
> spaced FM antenna face-mounted on a 24" face triangular tower section 
> to the theoretical elevation pattern as published by an antenna 
> manufacturer.
>
> The NEC patterns shown in the upper left and right corners of this 
> slide were calculated for a slice across the elevation pattern at the 
> zero-180 degree azimuth line.  They would be different for slices in 
> other azimuth directions.
>
> The difference in the angles and amplitudes of the lobes and nulls is 
> easy to see.
>
> http://i62.photobucket.com/albums/h85/rfry-100/ElepatCompare.gif




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