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Question about filters 1 & 2 in GoldQuest SS V2

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  • Question about filters 1 & 2 in GoldQuest SS V2

    Hello together...

    Below I have some questions about filters 1 and 2 in GoldQuest SS V2.

    Eric Foster built the GoldQuest detector in various versions over several years. There was the GoldQuest, GoldQuest SS, GoldQuest SS V2, and GoldQuest V3.
    Compared to its predecessor (GoldQuest SS), the GoldQuest SS V2 features an additional filter 1 & 2 functionality.
    Reg Sniff once commented on these filters 1 & 2 as follows.

    “… The GQ and the GQ V2 are again, almost the same except for the addition of a second filter and maybe the changing of the coil connector. Again, the controls are fundamentally the same.”

    And that this dual filter is supposed to suppress interfering ground signals.
    “… and the dual filter to minimize bad ground signals.”

    Click image for larger version

Name:	Goldquest SS V.2 Pulse Induction Metal Detector Made by Eric Foster (2m).webp
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    Image of a GoldQuest SS-V2 detector

    Now my questions.
    1) Which "bad ground signals" are suppressed by these filters 1 & 2?
    2) What signal frequencies are suppressed?
    3) What might such a two-stage/dual filter circuit look like?
    4) How does it work together with the S.A.T. function?

    Any ideas? Thank you in advance for your input/help.



  • #2
    Does anyone has an info update on my questions?

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    • #3
      Sorry, I have no schematic for this. Probably the "filters" refer to high-pass filters which would help suppress slow ground signals. In the Gold Scan design there are 2 HPF sections; one is the SAT stage after the demods, the other is after the summation amp.

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