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How Ground Zone Corresponds with RT, ST Channels on AKA Metal Detectors

Discussion in 'Single Frequency AKA Metal Detector Discussions' started by SuchMuch, May 24, 2017.

  1. SuchMuch

    SuchMuch Detectorist

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    ice:
    ***qte***
    It seems to me, that ground zone is very narrow in AKA detectors or gradation of the zone is rough (few steps) and therefore problems with falsings, unstable behavior of metal detector and problems with GB shifting could occur.
    ***unqte***

    Vladi:
    ***qte***
    AKA metal detectors on a physical level (hardware) are just common VLF detectors (synchronous phase metal detectors) those do not differ from VLF detectors being produced by other manufacturers.

    Conversion slope (dU/dF) of synchronous phase detector depends on F by sinusoidal rule. This means it varies from zero to to the very maximum. Therefore metal detector precisely GBed over the ground (ground signal is assigned to zero) is not able to "detect" ground. This "blind" zone could be narrowed or widen by setting levels (RT, ST channels)
    ***unqte***

    SuchMuch Remark:
    Subject Vladi's post puts dispute whether ST or Gain should be kept on high (pls check thread "
    Gain vs ST (Sensitivity), RT (Threshold)") to the end. Keeping levels on high (that is equal to keeping RT, ST on low), we widen ground zone. As we know, deep signals being impacted greatly by ground signal are shifted very close to it. With wide ground zone deep stuff will just fall into the zone and will not be sounded by AKA metal detector.
    In case of conductive grounds levels could be set on high because "salt" (its vector is orthogonal to ground signal vector) will push signals up from ground zone. Thus deep signals will be pushed up into sector of deep copper whilst falsings will be kept in ground zone
     
  2. Sam Massingham

    Sam Massingham AKA Sectarian

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  3. SuchMuch

    SuchMuch Detectorist

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    Last edited: May 25, 2017
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  4. mschmahl

    mschmahl "AKA Deutschland" Group Moderator Staff Member

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