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Test Results - Improved Grounding

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  • Test Results - Improved Grounding

    I have been attempting to build a double D coil for my Minelab Explorer but I could not get a decent signal on my scope due to EMI in my house. Even using the stock Minelab coil the signal was a mess, looked like a sine wave junked up with a lot of noise.

    Then I remembered a discussion with Carl and Erik about how improving the ground on a PI coil had realy cut down the noise so what the heck I connected my scope ground up to the Explorer ground and poof instant, stable, clean square wave!

    Hmmm this was with the sens at 10 (1/3 power) so I cranked the sens to 20...it was still rock solid stable. That is normally impossible in my house, the Explorer should have going crazy. Hmmm what about depth...I passed a seated dime over the coil and the depth seemed to be about what I would exepect in the field at sens 20.

    I cranked it up to 28 and it finally became instable...but the sens at 20-24 inside my house, thats incredible.

    If this glacier in my yard ever melts I'll test this because there is significant EMI all around my house.

  • #2
    Re: Test Results - Improved Grounding

    ??? emi

    hum channel it away using earth magnetics{laylines}

    set up a channel using a couple of 10- 100 watt lightbulbs

    you can dampen the emi around you

    this way channeling it into a row of trees is good fun

    also a good way too set a local non varient field in a very mineralised ground

    then you dont need any form of fariday shield

    just a couple of active light bulbs {running }on pwm 1khz 50 50 duty

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