[GreenKeys] 10 Hz shift RTTY?

[David I. Emery]

On Tue, Jul 25, 2017 at 06:11:12PM -0700, tony.podrasky wrote:
> Interesting.
> 
> I was told, a long time ago, that in one of the North/Central
> states, there was a REAL LONG wire antenna that was buried - and
> it was used to talk to subs.

	That is the bell ringer stuff on 76 Hz (ELF).   That is seventy
six hertz (a little above the power line on 60 Hz), not 76 KHz BTW.

	Last I heard they had given this up and turned it off.

	It was never fully developed to cover the entire area
originally proposed for the antenna grid, and at one point they
began using hv power lines as part of it instead of burying the cable.
Distances were in the high tens to hundreds of miles.

	IIRC, the upper Michigan peninsula was used for some of this
due to the soil conditions and iron in the rocks...

	And some of the underground COG/NCA bunkers had (maybe still have)
buried VLF/LF loops for comms in those frequency ranges (way over 76
Hz, closer to 76 KHz or higher)... with dimensions in the hundreds to
thousands of feet.   This depends on soil conditions at the site I 
understand.


-- 
  Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
celebration of what could have been, but wasn't and is not to be now either."