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Interesting NVIS use anywhere HF antenna

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  #9  
Old 05-04-2012, 06:11 PM
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Originally Posted by Moleculo View Post
More accurately, Near Vertical Incidence Skywave propagation is basically sending a signal almost straight up so it can be refracted back down. The idea is to get a signal footprint in a localized, 500 mile or so radius. Wikipedia has a good short article on it: Near Vertical Incidence Skywave - Wikipedia, the free encyclopedia
This was successfully done for comms during Desert Storm, the vertical antennas were basically useless due to all the static, they laid them down horizontal using the vehicle as a reflector/ground plane and NVIS props allowed reliable comms to other field ops.

Read that on the military.com site article was interesting.

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Old 05-04-2012, 06:33 PM
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There is no benefit with NVIS antennas as far as direction finding is concerned, they can be DF'ed like any other antenna.

Mole', I think you might mention CCD antennas to your friend. They aren't all that directional, but can certainly be "ground mounted" if assembled correctly.
- 'Doc

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  #11  
Old 05-04-2012, 06:45 PM
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Originally Posted by W5LZ View Post
There is no benefit with NVIS antennas as far as direction finding is concerned, they can be DF'ed like any other antenna.

Mole', I think you might mention CCD antennas to your friend. They aren't all that directional, but can certainly be "ground mounted" if assembled correctly.
- 'Doc
Which is why I said, help avoid.

NVIS energy is received from very sharp angles, which makes location finding very difficult, It is also more immune to local ground wave jamming. NVIS, a known and proven part of military communications.

This is one reason we used NVIS, plus it's easier to shoot and scoot.

Last edited by m42duster; 05-05-2012 at 03:13 AM.

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  #12  
Old 05-05-2012, 04:33 AM
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Originally Posted by W5LZ View Post
There is no benefit with NVIS antennas as far as direction finding is concerned, they can be DF'ed like any other antenna.

Mole', I think you might mention CCD antennas to your friend. They aren't all that directional, but can certainly be "ground mounted" if assembled correctly.
- 'Doc
Wake up DOC no one said anything about direction finding using an NVIS antenna.

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  #13  
Old 09-07-2012, 09:38 AM
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Just saw your post about the NVIS antenna that lays on the ground. Very interesting. Do you have anymore info about it or if it is avaiable?

Greg

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Old 09-07-2012, 04:16 PM
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wavrider,
See post #8. And I didn't say anything about using them for DF'ing either.
- 'Doc

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Old 09-07-2012, 04:36 PM
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Just saw your post about the NVIS antenna that lays on the ground. Very interesting. Do you have anymore info about it or if it is avaiable?

Greg

I could find out what they did with it.

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  #16  
Old 09-07-2012, 04:47 PM
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waverider,

Read post #11 and you'll see why the military likes NVIS.

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