[TenTec] New and Improved Terminology

[CSM(r) Gary Huber]

During the mid 1970's, U.S. ARMY FIELD MANUAL 24-18, Appendix M and other 
pubs referenced the Near Vertical Incident System antenna and its 
development to meet a 0 to 500 mile skip-zone free communications 
requirement in jungle and mountainous terrain. The antenna height 
recommended was one-eighth wavelength or less including one tactical antenna 
system consisting of a pair of 4 MHz and 7 MHz inverted Vee dipoles with 
common coaxial feed guying a twenty foot pole.   NVIS sky-wave path loss for 
3-7 MHz should be 110 dB.  Back in the mid-1980s I used a NVIS inverted Vee 
(16 foot pole) all band doublet fed with 450 ohm line for a daily sked over 
a 110 mile path either on 80 or 40 meters depending on absorption / 
propagation.  Never used more than 100W.


Best regards,

CSM(r) Gary Huber - AB9M
9679 Heron Bay Rd
Bloomington, IL 61705
(309-662-0604)
www.csm-gh.com
glhuber at msn.com
gary.huber at us.army.mil

-----Original Message----- 
From: Steve Hunt
Sent: Friday, December 31, 2010 5:03 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] New and Improved Terminology

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

On 31/12/2010 05:13, Dr. Gerald N. Johnson wrote:
> 80s sounds like when the name was invented. I recall commenting at a
> radio club meeting when the topic of NVIS was announced that we'd been
> doing that for eons, so what's new? The name I guess.
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