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Thread: Is there any way to get rid of EMI effecting our metal detectors, besides detuning?

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  1. #1
    us
    ARRG

    Feb 2005
    Sarasota, FL
    Whites Surfmaster PI Pro and Whites Surfmaster PI, Minelab Excal NY blue sword. 2 White's Dual field pi, Garrett sea hunter pi II (but don't use it for obvious reasons) 5' x 3 1/2' coil underwater Pi
    2,025
    142 times
    Shipwrecks

    Is there any way to get rid of EMI effecting our metal detectors, besides detuning?

    I mainly use PI detectors that are very sensitive. They pick up EMI from power lines and transmits(Bluetooth and earphones) from cell phones on the beach. Is there anything besides detuning so much we cannot hear it? Last week a friend that has a dive shop / detector shop took me with him, or I took him with me, to the beach to test out the new Minelab Equinox. First someone turned on their earphones, about 30 feet away, started getting static on the Equinox, we moved. Later we moved down near the waters edge beach and static again. We couldn’t find the rings we buried in wet sand with the Equinox and I got out my Whites Dual field and did have wa wa wa wa from cell phones but could hear through it, and found the ring. Disturbing to have that and have it diminish the the pick up on the detector. Is there anything that can stop that? I know the Whites coils and cables are shielded, but the coils are-like antennae’s and pick up any stray signals.

  2. #2
    us
    Jan 2007
    Cape Cod, Massachuestts
    Garrett (Infinium, ATPro, ATX), Minelab Excalibur, Troy (X2 X5), Tesoro Conquistador, Whites (Surfmaster PI, 5900, Quantum), JW Fisher 8X, DetectorPro Underwater 8", Minelab Equinox 800.
    370
    401 times
    Beach and Shallow Water Hunting
    I have seen where some have used a snap-on RF / EMI filter (choke / ferrite core) around the coil cable.
    I do not know how effective they are but for a couple of bucks one might help.
    I have two cameras that came with a USB cable that have one of the ferrite cores on the cable.

    If you try one, let us know how it works for you.

  3. #3
    OBN
    OBN is offline
    us
    Dec 2008
    Mid-Atlantic Waters
    Excalibur
    5,519
    4542 times
    Old Gold, New Gold, Any Gold
    Honorable Mentions (1)
    No effect with the ferrite core choke, hard wired a coil, if I remember correct had a couple on it.

    Before Minelab even had shielding on the Excalibur 2 I was working with it on the old blues, never any luck.
    Click image for larger version. 

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    The only shielding I have come up that worked was being able to hunt in ruff waters and have a (almost) silent threshold. No falsing.

    Effort is Important, But knowing where, can make all the difference!





  4. #4
    us
    Apr 2011
    Excal with Wot, Infinium LS , CZ7a PRO
    98
    87 times
    This is what I did to my Blue I had a spot next to my knobs that if you touched it would false.
    I raped it in static bag I cut up and the falseing stopped to the touch.
    It runs smooth but who knows when it is working or there is no interference out there.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    OBN likes this.

  5. #5
    OBN
    OBN is offline
    us
    Dec 2008
    Mid-Atlantic Waters
    Excalibur
    5,519
    4542 times
    Old Gold, New Gold, Any Gold
    Honorable Mentions (1)
    Great Idea Jim!!

    I know Mike and I had talked about redoing a complete new Pod that would be shielded on the inside with no knobs other then a charge port and toggle, on/off. Never got around to it but I really like your idea!!
    Jim in MA likes this.

    Effort is Important, But knowing where, can make all the difference!





  6. #6
    us
    ARRG

    Feb 2005
    Sarasota, FL
    Whites Surfmaster PI Pro and Whites Surfmaster PI, Minelab Excal NY blue sword. 2 White's Dual field pi, Garrett sea hunter pi II (but don't use it for obvious reasons) 5' x 3 1/2' coil underwater Pi
    2,025
    142 times
    Shipwrecks
    OBN, I know Whites uses a spray in nickel shielding in their coils. It can be bought in an electronics store or I am sure found on line. I have used it in the past to prevent cross talk and alien cross talk, in building up detectors and fish finders, etc. works fine. Maybe painting the inside of the battery box and controls box might help.
    OBN likes this.

  7. #7
    us
    Jan 2007
    Cape Cod, Massachuestts
    Garrett (Infinium, ATPro, ATX), Minelab Excalibur, Troy (X2 X5), Tesoro Conquistador, Whites (Surfmaster PI, 5900, Quantum), JW Fisher 8X, DetectorPro Underwater 8", Minelab Equinox 800.
    370
    401 times
    Beach and Shallow Water Hunting
    Not EMI, but interesting (at least to me).

    My Infinium would false every time the control box would enter or exit the water, fresh or salt.
    Then I noticed that touching the coil connector I could make the "falsing: happen. I wrapped the connector with electrical tape, problem was gone...
    Later in my life, I read that Garrett had a ground wire to the connector and it should be removed to correct the falsing.

    I hesitated for a few years as I was unsure of how to open the Infinium. Finally found the instruction and after a five minute task I have never has it false again. Since then I have removed the ground from three other Infiniums all with great success.
    OBN likes this.

 

 

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