If all of the radiated energy directed towards ground is reflected
upwards by a "perfect salt water ground", then the skyward
power can only be doubled--3db. Why then is a salt water
location so coveted?
k7puc
-----Original Message-----
From: rick@area.com <rick@area.com>
To: towertalk@contesting.com <towertalk@contesting.com>
To: <towertalk@contesting.com>
Date: Wednesday, December 22, 1999 9:05 PM
Subject: [TowerTalk] re: The Ultimate (Perfect) Ground?
>
>> From: Henry A Pollock <k4tmc@juno.com>
>> Subject: [TowerTalk] The Ultimate (Perfect) Ground? - Think Piece
>>
>> Handbook, it appears that saltwater represents a ?perfect ground.? And
>> right on the beach, you have a perfect ground in both the near field and
>> far field. It appears that with 120 radials of 1/2 wavelength, you can
>> obtain a reasonable perfect ground in the near field (re Ant. Hndbk. Chpt
>> 3 - Table 1). Realizing that it would be impractical to try to obtain a
>> far field perfect ground in all directions (360 degrees), what about
>> trying to implement this in one direction? For those of us on the East
>> Coast, 45 degrees puts one right in the center of Europe. Could it be
>
>I tried this on 20 meters. I laid out 60 radials 250 feet long in a
>45 degree sector pointed towards Europe. It produced no improvement
>with a 1/4 wave vertical and 2 to 3 dB improvement (to Europe only)
>for a 1/2 wave vertical. I also did simulations up to 1000 radials
>500 feet long on NEC3-GS. Bottom line is that you cannot (practically)
>simulate being on the beach with ground wires. Complete details are
>on my web site: <<http://www.karlquist.com>> .
>
>Rick Karlquist N6RK
>
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