[Milsurplus] Horizontal loop on German vehicles

[KD7JYK DM09]

"First of all, the freq is too high; my earlier sources on NVIS 
transmission tell that NVIS propagation cannot be supported above the 
10-12 Mc range."

Not to start a pissing contest, argument, debate, or even really much of 
a discussion, these are just my late night thoughts...

Without going overboard, which I can certainly do for many hours, and 
many, many, thousands of words, having researched the physics 
responsible for, and operated NVIS for years, I'll say this:

The limitation was based on the radio equipment on hand, and operating 
conditions, when it was noted, and is all over the HF spectrum depending 
on what you happen to read, because NVIS is a completely fluid dynamic.

If your radio goes to 12 MHz, so may NVIS.  You can't get 20 Mc NVIS 
with a 15 Mc radio, and 15 may not have supported it in the few minutes 
it was checked, so that may not even be a limit noted, but check a few 
days later on 10, and, "A-Ha!"  Typical "radio" NVIS was found to reach 
~260 MHz (261, or 263, I forget now) in the early 1960's under atypical 
atmospheric conditions, by the Atomic Energy Commission, DoD, and 
National Weather Service (those who were actually studying it), and I've 
personally demonstrated it as high as ~563 THz (Center frequency 
563,519,657 Mc a little higher than 12, hoping to reach ~758 THz in the 
next few months with a 15W setup, just waiting for the right atmospheric 
conditions, and safety equipment, as it tends to destroy biological 
material, as well as incinerate the atmosphere)

NVIS is by far one of the least understood cluster-fornications in the 
communications world (honestly, it makes CB look like a Mensa 
convention), and easily, information into the high 90th percentile is 
incorrect, and based of repeated, and evolving assumptions with severely 
limited, poorly understood, if at all, information, and equipment, as a 
basis.  There are numerous forums, and webpages dedicated to a total 
lack of understanding of what it is, or how it works.

Seriously, one site opens with a VHF radio, and antenna, the basic 
mobile installation not understood in any way, then goes on with page, 
after page, after page, explaining, and demonstrating, how it's used for 
low to mid-HF NVIS, and the site has been up a good twenty years. 
That's two decades of cranking out imbeciles that forgot to pay 
attention, or couldn't, at word, or even picture #1.

Just look at the recent thread of certain antennas used for NVIS, for 
example, to find everything but the word "antenna" is incorrect, and 
inapplicable.

NVIS is not a mode, NVIS is not an antenna, it is a fortuitous aspect of 
a combination of processes, an affect one can take advantage of, should 
the conditions exist at the particular location, at the moment in time, 
at the frequency desired, and with the equipment that may expose, and 
briefly take advantage of it.

Quite coincidentally, being radio operators, at times we happen to be in 
a position to notice it occasionally, generally due to less than optimal 
installations.  An unrealized "Whoops", with benefits!

Kurt