[TowerTalk] NVIS (not exactly towers, but HF)

[John Simmons]

$33 for the 5 page article. I'd like to read it but I'm not sure there 
would be enough unique info to justify the price.

Perusing the IEEE website I wasn't able to find the cost for individuals 
to become a member.

-de John NI0K

jimlux wrote on 6/8/2020 1:02 PM:
> I guess if you have a tower, you're not so interested in NVIS <grin>
> Interesting paper (behind IEEE paywall unfortunately) in this month's 
> Antennas and Propagation Magazine.  The authors have a series of 
> papers over the past few years of interest, looking at various 
> performance factors.
>
>
> P. J. Coetzee and W. P. du Plessis, "Performance Limiters of 
> Near-Vertical-Incidence Skywave Propagation: A Scientific Approach," 
> in IEEE Antennas and Propagation Magazine, vol. 62, no. 3, pp. 39-44, 
> June 2020, doi: 10.1109/MAP.2019.2943313.
>
>
> Abstract:
> Near-vertical-incidence skywave (NVIS) propagation is defined as 
> providing continuous coverage from nearly 0 km (just beyond the line 
> of sight) to a couple hundred kilometers from the transmitter with no 
> skip or dead zones. NVIS communications are especially effective 
> during disaster-relief operations when infrastructure is severely 
> damaged. The ability to accurately determine the performance limiters 
> of NVIS propagation can help in the planning of high-frequency (HF) 
> (3-30 MHz) emergency communication links. In the literature, widely 
> varying radial distances (from as few as 50 to up to 160 or even 320 
> km) for the coverage attainable by NVIS propagation have been 
> reported. It is very difficult to plan an NVIS link for homeland 
> security or disaster relief when the published guidelines vary to such 
> a degree. In this study, a scientific approach was utilized to 
> determine the NVIS performance limiters for varying solar conditions, 
> times of day, and geophysical locations.
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