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[TowerTalk] more on NVIS

To: towertalk@contesting.com
Subject: [TowerTalk] more on NVIS
From: Jim Lux <jimlux@earthlink.net>
Date: Mon, 25 Jul 2005 12:08:29 -0700
List-post: <mailto:towertalk@contesting.com>
There's an interesting article at:
http://www.gordon.army.mil/AC/Fall02/BCTSOP2.htm

which discusses various HF comm modes, with a fair amount of detail on 
NVIS.  In particular, go about 2/3 of the way down to where they start 
talking about horizontal dipole antennas.  There's a chart showing 
performance (straight up) for halfwave dipoles over "average" and "perfect" 
ground at various heights and frequencies (all the way down to 0.1 ft). and 
a discussion of preferred heights (30 ft is recommended)
http://www.gordon.army.mil/AC/Fall02/dffig15.jpg


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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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