Early 60s - Moses Lake Washington SAC base.
End of runway shack that had some kind of device that measured earth voltage (We may have been picking up timing signals from somewhere.)
We recorded earth voltage on a paper chart where we neutralized the DC component leaving the AC part detectable.
Curious about how senstive this was, it phoned the fella on night shift that I was going to try something - just watch the chart.
From the barracks about 2 miles away, I inserted two wires, bare ends in the ground, about 50 feet apart.
I then stuck a 9 V battery to the other two ends.
He replied the needle just pegged on the chart recorder.
“From the barracks about 2 miles away, I inserted two wires, bare ends in the ground, about 50 feet apart.
I then stuck a 9 V battery to the other two ends.
He replied the needle just pegged on the chart recorder.”
Ok... So the “DC” current from the 9 V battery somehow activated a residual detectable “AC” current?
I am literally going to try this right after daylight...