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## Re: Topband: Antenna Engineers gone wild

 To: topband@contesting.com Re: Topband: Antenna Engineers gone wild K4SAV Wed, 08 Sep 2010 13:27:32 -0500 mailto:topband@contesting.com>
 ```Everything works. It's just a matter of degree. This one can easily be evaluated with EZNEC. The conductivity of seawater is 5 s/m. You can plug that number (in ohm-meters) into EZNEC instead of copper or aluminum. It looks like that little stream he has was about 0.25 inches in diameter. If you forget about the problem of matching an unknown length (which is randomly changing length) and just create a 1/4 wavelength vertical of seawater, you can get an estimated of the max gain. To bound this, assume no near field ground loss, and use a mininec ground. For a 2 meter ground plane the gain is about -21 dBi. For a 160 meter antenna the gain is about -45 dBi. But that's not the end of the story. Theoretically this could work. You just need a big stream of water. Say a stream about 20 inches in diameter. That should give a gain of about -0.6 dBi for a 160 vertical, assuming no near field ground loss. That push should sink most ships. Anyone want to calculate the thrust? I liked the signal report the guy gave, "maximum signal 5 by 5", thru the repeater yet. This is similar to the pine tree vertical where a guy tried to couple a signal into a tree trunk. In that case the main radiator was the feedline. That could be the main radiator in the seawater experiment too. You notice there was no ground plane. Where do you suppose the currents go? Jerry, K4SAV _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK ```
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