Talk:Near Vertical Incidence Skywave

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This article was nominated for deletion on October 8, 2005. The result of the discussion was keep.

— JIP | Talk 09:24, 16 October 2005 (UTC)

The two articles recently deleted from this entry were not spam. I checked them quite thoroughly and found useful HF NVIS antenna design and construction information, historical info regarding use of mobile NVIS antennas during wartime, and no mention of anything commercial whatsoever. The publication mentioned is a non-commercial ham radio magazine, as far as I can tell.

The articles should be restored. Scott Johnson 13:23, 24 April 2007 (UTC)

[edit] NVIS as antenna type?

Yesterday I added this article to the "Radio frequency antenna types" category on the basis that NVIS antennas are not infrequently discussed as such in amateur contexts, but today it occurred to me that there is a distinction between the skywave itself and the antenna that makes use of it. Still, such antennas are discussed in the article, even if they are in many cases just a subset of dipoles and (aside from their distance from the groundplane) physically indistinguishable therefrom. Of course, NVIS could be employed by other types of antenna. I'm going to leave the category tag as I think NVIS might be a useful concept to have in a list of antenna types, but wanted to raise the discussion if anyone thought otherwise. --Ninly 01:56, 4 June 2007 (UTC)

[edit] Antenna configuration or propogation method, not necessarily antenna type

In my opinion, it is not a new type of antenna. The significance comes from how the antenna is deployed, not built. The key is how far above the ground to deploy the dipole (7ft +/- 3 inches for the 40 meter version). Also, this article only discusses one reflector directly beneath the dipole, but other reference materials show 3 reflectors and 10db of gain, not the 6 shown here. Other articles place two more reflectors on the ground exactly parallel to the antenna but 6 feet to each side of the antenna.

I would also like to see this article referenced in the "40 meters" article as 40 meters is the highest band to benefit from NVIS and is apparently the most popular band for this propogation method. —Preceding unsigned comment added by 68.42.4.138 (talk) 15:39, 10 October 2007 (UTC)

[edit] Additional external links added on April 2nd, 2008

As I have been performing field-experimentation of NVIS antennas since the early 1990's, I added two external links to related pages on my site at http://www.tactical-link.com .. The links are for "Field Deployment" and "Mobile NVIS" antennas.

Note that the additional links include information on testing done on the amateur radio 40 meter band (see the field-deployed NVIS external link in the article)

Also, the reason for the low height above ground is to limit ground-wave generation so that received skywave signal does not suffer distortion at the receiving station which can occur when receiving both a groundwave and skywave signal.

Trish (talk) 07:28, 2 April 2008 (UTC)Patricia Gibbons wa6ube@arrl.net 66.245.150.200 (talk) 06:55, 2 April 2008 (UTC)Patricia Gibbons wa6ube@arrl.net66.245.150.200 (talk) 06:55, 2 April 2008 (UTC)