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Help troubleshooting - XLT - would a short circuit in the TX coil damage the transmitter circuit?

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  • Help troubleshooting - XLT - would a short circuit in the TX coil damage the transmitter circuit?

    Hi everyone,

    Was out detecting with a bigfoot coil.
    The coil at some point decided to make a lot of noises when sweeping
    and did not detect metal anymore which I found out along the way after realising it wasn't the soil gone funny or interference.

    At home I tested with another coil - the XLT is fine.

    Measured Rx @ 124 Ohms and Tx was an open circuit.

    Cut the cable 4 inches above the bigfoot and started measuring.
    The coil connector and long part of the cable are fine.

    When measuring the Tx part it is open circuit, when pushing the cable in one direction, I get a solid reading of 0.2 Ohms.

    I am not sure if this is indicative of a short circuit, as data on the net suggests somewhere around 1.6 Ohms for Tx.

    I would like to test the coil and see if the 0.2 Ohms would work, but am afraid of maybe damaging part of my XLT.

    NOTE: This bigfoot appears to be different than other descriptions I have found, in that the whole cable itself has NO shielding.
    Only 4 Pins of the plug are connected. There are only two coax wires inside.


    Of course I dread having to take the bigfoot apart and most likely messing things up.

    Any hints, workarounds etc ... most welcome.

  • #2
    Measured Rx @ 124 Ohms and Tx was an open circuit.

    nothing here for . in serial with tx connected resistor 51-56 Ohm. the normal situation for VLT coils. so you see such big the value.
    C and R give first filter against EMI outer noise on tx part.

    in english LOW PASS FILTER.

    Comment


    • #3
      Thanks KT!
      Not sure if I completely understand, but it looks like I cannot destroy TX transmitter by connecting a short circuit.
      Normal TX coil is 1.6 Ohm, nearly a short circuit anyway.

      I will be making a new thread for the repair of the bigfoot coil.

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