[CQ-Contest] Contest QTH
n6tj at sbcglobal.net
Mon May 24 17:49:40 PDT 2010
It's a good thing I didn't know all of this before plugging into all of
those horizontally polarized antennas 20 ft from the edge of Ascension
Island. Just think how much louder my puny signal would've been with
Jim Neiger N6TJ ZD8Z
From: "Bill Tippett" <btippett at alum.mit.edu>
Sent: Monday, May 24, 2010 4:31 AM
To: <cq-contest at contesting.com>
Subject: Re: [CQ-Contest] Contest QTH
>>> While salt water is definitely good for verticals, but it
>>> doesn't help horizontally polarized antennas like Yagis.
>> Not true. Even horizontally polarized antennas gain from the salt water.
>> Besides enhancement from the ground, reflection conditions in the
>> immediate vicinity of the array, signals at the salt water edge are
>> enhanced regardless of polarization.
> EZNEC shows minor improvement for horizontal polarization over
> salt water but it's at high angles...not low angles as is the case for
> vertical polarization. At 14 degrees TOA, there's a 0.51 dB
> advantage, at 7 degrees a 0.26 dB advantage, at 3.5 degrees a 0.16 dB
> advantage. The reason for this is that ground conductivity has less
> reflectivity effect as the incidental angles become very low.
> Isn't this discussion déjà vu of déjà vu?
> 73, Bill W4ZV
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