I am currently playing around with this idea for improving depth and efficiency of metal detectors i have built one for my 60khz diablo and shows promise the idea would probably work for pulse induction designs as well
this idea is just something i came across in my other interest free energy devices.
and is very simple for VLF - two transmit coils phase connected the same way stacked one on the other is supposed to amplify the magnetic field and there is no reason you can not stack 3 or 4 for the same effect something worth experimenting with.
this is a patent explaining it.
US4806834.pdf


and a little trick i use to balance my coils is null as close to what you need then use a small ferrite fragment moved around to do the final tuning point then glue it down works for me.
this idea is just something i came across in my other interest free energy devices.
and is very simple for VLF - two transmit coils phase connected the same way stacked one on the other is supposed to amplify the magnetic field and there is no reason you can not stack 3 or 4 for the same effect something worth experimenting with.
this is a patent explaining it.
US4806834.pdf
and a little trick i use to balance my coils is null as close to what you need then use a small ferrite fragment moved around to do the final tuning point then glue it down works for me.
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