[GreenKeys] 10 Hz shift RTTY?

[Dave Horsfall]

On Tue, 25 Jul 2017, Richard Knoppow wrote:

> 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.

The name Nathan B. Stubblefield springs to mind; he predated Marconi.

-- 
Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will suffer."