[Milsurplus] Horizontal loop on German vehicles

[KD7JYK DM09]

> I believe NVIS propagation accounts for the good results the state 
> Forestry Departments got with their SPF and such radios, operating in 
> the 3 MHz band, about 2 watts AM, and rather low halfwave or off center 
> fed wire antennas.

Off the top of my head...  I suspect ground-wave, near (relative) field, 
and knife edge propagation, with a little bit of transitioning through 
some good radio conditions from time to time.

The same conditions that permit NVIS, also prevent the lower frequencies 
from working well.  Compare the forestry radios working as well as 80m 
during the day, or night.  When 80 is good, so would their radios be, 
when bad, same thing.  Try working 80m with 2W AM at 2 in the afternoon. 
  Their radios wouldn't be any better, but they might be close enough 
that the poor conditions don't matter too much.

On a side note, I checked my safety equipment, and I have the necessary 
safety gear for my 758 Million MHz NVIS experiment.  I should have a 
source, and band-pass filter by the end of October (ordered, just 
waiting for delivery).  I expect adequate atmospheric conditions some 
time between then, and probably March, or April.  In the shower I came 
up with a way to detect, and indicate NVIS propagation at this 
frequency.  I'll run some preliminary tests on the separate components 
this evening.

Kurt