Hi İvconic,
ok emfad is not a magnometer.
just ulf or vlf
I can not understand that
our vlf detectors like garret and whites, they have transmitters which is really close to target than base stations of radios or else.and they can not penetrate deep.but this emfad does.HOW can it do this.
frequency used in detectors is lower than emfad recievers.
and how can differ cavity and metal?
in pics I tried to show dept determination of ulf .this is my idea but logical.
there are lots of stations on earth.each have different frequencies this is why we ne broad band reciever .
each color in pic represents different station and frequency.
according to drawings
angle CAO = angle CBO ,say X degree to this angle
our selonoid winding(antenna) also has recieveing angle which is equal to 2X degree
so
we measure the lenght between A and B ,= L
then divide 2 = L/2,
sin(X) / cos(X)= TAN (X) =dept of target / (L/2)
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