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[Antennaware] ground parameters

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Subject: [Antennaware] ground parameters
From: (
Date: Fri, 12 Apr 2002 03:36:38 EDT
Your statement is basically true but even if Eznec was accurate there is very 
little value to it.  You get what you get and can't change it.  If the beam 
is designed for gain or F/B that's all you can do.  Knowing the angle of 
radiation is academic only.
     Having a ground system of at least 1/4 wave radials is necessary for 
proper operation of a 1/4 wave vertical.  Making them 1/2 wave has a slight 
advanage.  The length beyond that of any value takes a lot of wire and space 
which few have.  Salt water is the only way to go.
     I've found that 1/2 wave verticals don't need a large radial system for 
effecient matching and operation.  I've got great results with just 4 33' 
radials here in Seattle on 160-40M.  The 160M was 60' high top loaded 1/4 
wave.  The 75M vertical was a top loaded 1/2 wave 60' high.  I will runs 
tests at my new location in SD of side by side 1/4&1/2 waves on a few radials 
vs many.  I have the room to do this.  I discovered how effective 1/2 wave 
verticals fed with an L network to just a ground rod were in 1949.   I 
couldn't lay any radials were I was.  I was on Main Street.  W7DND in 
Bremerton, Wa in the 50's was on a salt water inlet pointing East and he had 
vertical beams on a beach that were killers.  K7GCO

In a message dated 4/11/2002 5:38:32 PM Pacific Daylight Time, writes:
> Using EZNEC or one of the programs that allows you to specify good,
> medium, poor, very poor, use "very poor". You get no help from that
> stuff, at all.
> Dense and extensive ground screens are required for vertically
> polarized antennas over such composition.
> 73 & GL,
> Guy K2AV.

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