$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.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|