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Re: [TenTec] New and Improved Terminology

To: tentec@contesting.com
Subject: Re: [TenTec] New and Improved Terminology
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 31 Dec 2010 09:52:58 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
In the book Antenna Topics taken from Pat Hawker's Technical Topics in 
Radcom from 1958 to 1999 mentions NVIS the first time in June 1988 in a 
column titled "Antennas for Medium-haul Paths." He says,
 > A term now being applied in professional communications is "nvis
 > links", standing for "near-vertical incidence skywave links". A
 > conference paper by B S Collins & B R Phillips of C & S Antennas
 > Ltd gives the options for nvis as: compact loop antennas; horizontal 
 > low dipoles; fan dipoles; loaded dipoles; delta (half-rhombic) loops. 
 > The "most satisfactory' nvis antenna for fixed stations is given as
 > the (sloping) log-periodic dipole array (lpda) but this is regarded
 > as "too large and complex for transportable use."

Best I can tell from his index, the most recent previous discussion of 
the medium haul range antenna was in 1975 but was discussed several 
times earlier, just the term nvis wasn't used.

One of those Collins & Phillips papers was:
Apparantly Nordic HF conference 89, ISBN says '91.

and web pages say the German military used NVIS in WW2. Heck, Marconi 
used low horizontal antennas before 1900.

Back to Collins and Phillips, one paper was "A wideband transportable 
antenna for NVIS Links," presented at the Fourth International 
Conference on HF Radio Systems and Techniques, 1988." Published by IEEE. 
The only one Collins admits was with Phillips. Probably the paper Pat 
Hawker saw.

Then I found a Brian Collins Bibliography. In:
a paper from 1980 he talks about antennas for short ionospheric paths
but doesn't say "nvis."

The bibliography is: 
Unfortunately several of the papers aren't available for down load there.

So its clear nvis was invented as the descriptive term between 1980 and 
1988. I don't know who claimed it. Pat Hawker read much radio 
literature, if he didn't see it before the 1988 paper, it might not have 
been used before. Its only available from IEEE. I don't know if the ISU 
library has it, can't go there this week anyway.

73, Jerry, K0CQ

On 12/31/2010 5:03 AM, Steve Hunt wrote:
> Jerry,
> I seem to recall reading somewhere that the term NVIS dates from the
> Vietnam war; I'll see if I can find a reference.
> 73,
> Steve G3TXQ
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