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Tightening Coil bolts and Metal Detectors' Sensetivity

Discussion in 'Coils Fitting Single Frequency AKA Metal Detectors' started by SuchMuch, Apr 26, 2016.

  1. SuchMuch

    SuchMuch Administrator Staff Member

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    Mr. Ioan Susanin shared his experience how to run NEL coils without falsings. He is a Minelab X-Terra detectorist. I think his experience with NEL coils could be valuable for detectorists who prefer aftermarket coils rather than original AKA coils.

    Mr. Ioan Susanin's post translation:
    ***qte***
    I decided to make simple and reliable coil-to-rod fastening for Minelab X-Terra since original solution is pointless (like a toy). Original Minelab bolts and washings last short time and they are pricey. I took pvc tube and made 2 plates from it, drilled 4 holes with diameters matching sanitary bolts. I succeed creating cheap and reliable coil-to-shaft fastening:
    nel+.jpg
    nel.jpg

    When I went hunting with the new fastening first time I was really surprised: my always falsing NEL Tornado turned into stable non chattering coil even with Gain set on 30! :Scare3: Nowadays I'm able to hunt all day long with Gain set on the highest with totally no falsings, finds are coming out from fantastic depths... I wonder what is the reason that leads to these perfect results? Can scientists explain this fact? I suppose coil was falsing due to shaft's vicinity and adding distance 10 cms between rod and coil caused no falsings. Probably some mechanical issue with fastening was figured out? :Pardon:
    ***unqte***

    Lvovich's answer:
    ***qte***
    Get coil connected (without shaft) to metal detector Sorex Pro or Signum, metal detector and tighten coil bolt whilst in GB mode, you'll notice a significant signal. Should coil ears be longer, the signal will be smaller with exact bolt force tighteng. In other words the longer coil ears are, the smaller tension (source of falsings) occur in coil. Have you noticed AKA coils ears are the longest ones?

    It's obvious NEL guys are just copying everything and don't even think about deep qualities of coils. By the way, we hinted them to avoid forming coil hulls under vacuum. Vacuum coil hull forming doesn't allow to make ears long.
    ***unqte***

    SuchMuch's remarks:
    Referring to above I can make blw conclusions:
    1. Tightening any tm coil ears should be avoided and this concerns AKA coils as well. By the way, check the thread "
    my sorex was always on its side.not any more."

    2. NEL coil owners can make the same "middle ears" Mr. Ioan Susanin made and hunt with settings on higher.
     
  2. nigel westwood

    nigel westwood Iron Lord

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    SuchMuch

    SuchMuch Administrator Staff Member

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  4. nigel westwood

    nigel westwood Iron Lord

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    mike harvey AKA Novice

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  6. Rew

    Rew Moderator Staff Member Supporter

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    SuchMuch

    SuchMuch Administrator Staff Member

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  8. nigel westwood

    nigel westwood Iron Lord

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    SuchMuch

    SuchMuch Administrator Staff Member

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  10. Ringmoney

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  11. mschmahl

    mschmahl "AKA Deutschland" Group Moderator Staff Member Supporter

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    SuchMuch

    SuchMuch Administrator Staff Member

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    Ringmoney AKA Veteran

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    SuchMuch

    SuchMuch Administrator Staff Member

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  15. nigel westwood

    nigel westwood Iron Lord

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    SuchMuch

    SuchMuch Administrator Staff Member

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  17. nigel westwood

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