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.
>
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_______________________________________________
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.
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