Topband: radial layout and pattern skew

[Eric Scace K3NA]

Hi Tony --

   EZNEC 3 is not capable of modeling radials at 3-inches above ground.

   A 3-inch separation between ground and radial is below 0.001 wavelength at 160m.  Even with NEC4 one should avoid modeling wires
within 0.001 wavelength of the ground (unless these wires are vertical connections through the ground interface).

   NEC4 models indicate you will not see a significant pattern variation with azimuth in your situation.

   More importantly, since radials can't go into the dense woods, just build what you can and get on the air.

-- Eric K3NA

-----Original Message-----
From: topband-bounces at contesting.com
[mailto:topband-bounces at contesting.com]On Behalf Of Tony Reynolds
Sent: 2004 September 5 15:30
To: topband at contesting.com
Subject: Topband: radial layout and pattern skew


Hi All,
Sorry if this has been beat to death, but I searched the archives under
radials and pattern and thousands of articles turned up at once. Way to
course of a search.

I'm working on my ground system on 160 and I'm limited by dense woods to the
north of me making radial placement almost impossible in that direction.
Modeling this in EZNEC 3 with the radials 3" off the ground shows pattern
skewing of -2 to -3db in the direction of no radials. Which would kind of
make since. Then I found this web site:
http://www.amfone.net/ECSound/K1JJ16.htm
in which item one states that this doesn't happen. Is this the case, and if
so, is the skewing from wires being to close to the ground in EZNEC?

Thanks,
Tony
KB8JVH


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