[TowerTalk] NVIS antennas Re: dumbing down

[ersmar@comcast.net]

TT:

     FWIW - Here's a possible source for the eighteen-inch-above-ground NVIS antenna fables:  http://www.tactical-link.com/field_deployed_nvis.htm .  

73 de
Gene Smar  AD3F



> At 07:59 AM 7/22/2005, Tom Rauch wrote:
> > > At 02:00 AM 7/22/2005, Tom Rauch wrote:
> > >
> >
> > > Might well be, though, that a 18" or 2' high wire is much
> >easier to deploy
> > > in a field situation, than trying to get a wire up 1/4
> >wavelength on 40 or
> > > 80?  From a system standpoint, you might be willing to
> >accept the lower
> > > efficiency (and the certain interactions with objects
> >likely to be near it)
> > > in exchange for a faster deploy.
> >
> >If that is the advantage he had in mind, the writer would
> >have said that Jim. He plainly gets into nonsense about
> >groundwave/NVIS phase errors.
> 
> 
> Not that THIS author knew what he was talking about.. The original inventor 
> of the 18" idea (which has been around for at least 5-10 years, I think) 
> was the one who decided that it was a "reasonable compromise".  May have 
> been empirical (hooked it up, it worked well enough, said fine.. use those 
> orange cones as an antenna support), may have actually thought about the 
> theory (probably not...).
> 
> Then, along comes other folks who try to come up with a theoretical 
> justification however ill founded.
> 
> Then, along comes someone else who reads the previous ill-founded reasoning 
> and repeats it.
> 
> And, eh voila! A QST article.
> 
> 
> 
> >I don't think 18 inches high is a safe NVIS antenna height
> >for field deployment and it certainly is not electrically
> >worth a hoot. 18 feet, yes. 18 inches, no.
> 
> WHo knows what the original inventor was thinking?  May have had a bunch of 
> 18" high supports handy (lots of orange traffic cones around) 
> 
> 
> _______________________________________________
> 
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather 
> Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
> and ask for Sherman, W2FLA.
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk