[GreenKeys] 10 Hz shift RTTY?

[Richard Knoppow]

    This is reminiscent of the induction method of wireless transmission 
that preceded spark. I suspect that worked on a different principle but 
it allowed communication across rivers, etc., using long, buried wires.

On 7/25/2017 7:50 PM, David I. Emery wrote:
> 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.
> 
> 

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL