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Re: [TenTec] New and Improved Terminology (NVIS origins)

To: tentec@contesting.com
Subject: Re: [TenTec] New and Improved Terminology (NVIS origins)
From: Stuart Rohre <rohre@arlut.utexas.edu>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 03 Jan 2011 16:03:08 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Much of the discussion on NVIS term origin has been handled before on 
the NVIS reflector.

The British were using NVIS in Malaya during the Emergency there, from 
the post world war II time to 1963 and in governement dept. comms in 
1967.  Later from the Malayan armed forces uses, US Forces were 
experimenting with it in Viet Nam jungle conditions; as the Brits found 
it worked so well in jungle communications, especially around 4 MHz. 
The terminology may not have been used in its earliest days being called 
"short range HF comms" instead.

The Germans were certainly using it in WW2.  Their command vehicles had 
a grid or frame antenna structure, low enough to clear low trees, but 
most likely single wire fed from the pictures we can find on the web. 
Thus, the "antenna" was a kind of tuned almost isotropic radiator. But 
since it had considerable horizontal radiating parts, it clearly 
activated an NVIS mode, perhaps the low antenna was more of a 
convenience over whips when transiting forests.

-Stuart Rohre

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