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Hunting for Copper and Large Silver Coins (High Conductors) on Trashy Sites

Discussion in 'Metallica' started by SuchMuch, Jan 9, 2017.

  1. SuchMuch

    SuchMuch Administrator Staff Member

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    Rodion
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    ***qte***
    When the goal is to pick up copper coins ONLY on site polluted with iron and red brick particles, the best would be to equip small coil (for instance, 6"x10") or use coils running lower frequencies.

    In case of 14 kHz coil and middle type loans, burnt red brick particles (and falsings) will produce VDI +86 and 5 kopecks EK2 will produce VDI +85. As you see, difference is not significant and consist of 1 degree only.

    In case of 7 kHz coil, burnt red brick particles (and falsings): VDI +87,+88 and 5 kopecks E2: VDI +82.

    As to 3 kHz coil, burnt red brick particles (and falsings): VDI +88,+89 and 5 kopecks E2: VDI +78.

    As you see, it makes sense to hunt for copper coins with low frequency coils or coils with frequency 7 kHz at least and straight no for coils running frequency higher than 7 kHz. However, the lower frequency is the more it's sensitive to iron and less sensitive to non ferrous metals, even though signals of high conductive coins (copper, large silver) are noticeable on iron background especially if iron is mixed with brick particles.

    There is another important on trashy site setting worth to mention: LT Bound. LT Bound should be set up at the very border of iron mix corresponding with particular site, the rest will be sounded as non ferrous.

    To sum all up, detectorist will benefit more from low frequency coil and LT Bound shifted a lot into iron zone than from high frequency coil with LT Found shifted slightly into iron zone (shifting a lot is not possible due to non ferrous signals obtained from rusted iron). Smaller coil is the best solution due to less amount of targets it's able to cover
    ***unqte***
     
  2. mschmahl

    mschmahl "AKA Deutschland" Group Moderator Staff Member Supporter

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  3. TS
    TS
    SuchMuch

    SuchMuch Administrator Staff Member

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    SuchMuch

    SuchMuch Administrator Staff Member

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  5. mschmahl

    mschmahl "AKA Deutschland" Group Moderator Staff Member Supporter

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