Hi Franco,
You may be right. Maybe the ion detector will find the ground battery. Maybe I am wrong and atmospheric interference is not so strong as obscure the field from the ground battery when measuring the air ions. Keep in mind that when ordinary metal detectors measure less than 1 mv signal, this is induced voltage from eddy currents that were caused by the search coil. The ordinary metal detector is detecting an electromagnetic wave that is expected to arrive at a very specific time (PI), or a deformity in the elelctromagnec field of the search coil (non-PI). This is not the same as trying to detect static electric fields 4 feet above the ground.
I think it is time to build the ion detector and find out what it will measure. Then we can see for ourselves what it will measure and will not measure. This machine is very inexpensive to build. most of the parts are cheap or free from salvged equipment. My problem is I do not have the proper facility to construct the circuit. I can build the mechanical part if someone else builds the circuit boards with electronics.
So far nobody except Estseban has given us any practical information how to use this machine, and I think the only way we will learn how it works is to build the detector and learn from experience.
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