|To:||"Jim Lux" <email@example.com>,"Stephen Reichlyn" <Stephen.Reichlyn@ryansci.com>,<firstname.lastname@example.org>|
|Subject:||Re: [TowerTalk] horizontally polarized antennas and salt water|
|From:||Pete Smith <email@example.com>|
|Date:||Tue, 18 Jan 2005 14:00:45 -0500|
At 11:21 AM 1/18/2005, Jim Lux wrote:|
Pete Smith wrote: > > It does, but not a bunch. > > I quickly modeled a 40m yagi at 104 feet over average ground versus salt > water. Forward gain went from 11.86 dBi (avg) at 18 degrees to 12.45 dBi > (salt). Takeoff angle, interestingly, went up one degree for the better > ground plane. Moving the antenna down 6 feet over salt water moved the > takeoff angle up 1 more degree, from 19 to 20 degrees. >
It appears to be reduced losses. The average gain over salt water is -0.06 dB; over average ground it is -0.96 dB, per NEC-2.
73, Pete N4ZR
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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