Hi J PLAYER
You have fixed very good the main points of our “problem†. I have a 20 Mhz oscilloscope and other instruments in my lab but I don’t have a portable computer for external measurements.In the past time I have designed a vlf receiver in the range of 500 Hz – 50 Khz with a 2 ferrite coils as antenna and a VCF, a voltage controlled pass band filter, as tuning. Now I can achieve a ULF receiver in the range of 3 – 30 Hz with an E-Field antenna, a very high impedance amplifier, a VCF (I use CA3080 operational), a rectifier stage with a meter. By this “instrument†it would be possible to scan the above mentioned frequencies and to find possible anomaly in the ground (perhaps ground battery, my obsession !!!). I think it’s necessary to use a long handle, like a metal detector, for avoiding body’s influence.
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