[Milsurplus] NVIS again

[C. Whitaker]

de WB2CPN
It was the Viet Nam war that I first heard of NVIS, and I been in
USAF radio communications since WWII.  One favorite HF antenna
for almost every use was the Delta Match half wave dipole.  We
never had fancy names then, most of our technology came from
the American Radio Relay League Handbook, and a few others.
Sig Corps had some very good books on How & Why to do things.
An excellent Manual was all about HF Rhombics.  It had all the
math for building them, and aiming them.
So along comes the Nam war and someone invented a name,
NVIS, for what had been around for a long time.
73
Clete
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On 5/15/2012 2:40 AM, Hue Miller wrote:
> They didn't categorize it as NVIS, but every WW2 mobile radio with a wire
> antenna option, including the
> W.S. No.19, operated using this propagation feature WHEN USING WIRE ANTENNA
> and not the standard
> vertical whip. They simply didn't have masts tall enuff to raise the wire
> antenna an appreciable fraction
> of a wavelength, at those frequencies.  Actually, it occurs to me that with
> a short whip, there is lots of
> high angle radiation too, so I'd suppose even the whip transmitted a mixture
> of modes, ground wave
> and NVIS. It comes to mind, that I'd read in a German manual for a walkie
> talkie type, I think operating
> at low HF, that the user could expect LOWERED distance at night.
> -Hue
>
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