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Dave Platt wrote:
I believe that the high (4.1 dB) figure you are quoting is for an end-fire array, with the two antennas being fed 180 degrees out of phase. Actually 135 degree phasing and a cardioid pattern. 180 degree phasing results in a figure-8 pattern with 3.3 dB gain. Was out of town during the holidays and didn't realize that the earlier statement was limited to a side-by-side configuration. In a truck-antenna situation this would require placing the antennas in a front/back arrangement, not side-to-side. Yes, but what better place than the top of a metal trailer? Years ago, I helped a CB friend in AZ install one on his motor home with about 5 foot spacing if I remember correctly. Measured front to side ratio was huge. -- 73, Cecil http://www.w5dxp.com |
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