Threshold question
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  • 1 Post By Terry Soloman
  • 1 Post By Cherza

Thread: Threshold question

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  1. #1
    Feb 2017
    Minelab Etrac Garrett seahunter mk2
    32 times
    All Types Of Treasure Hunting

    Seahunter threshold

    Hi guys I just got my first pi Detector.
    Is it normal for the threshold to be Inconsistent like go totaly silent sometimes and then come back, when its on standard trash elimination?
    On discrete you can hear it its a threshold noise just like a vlf.
    Is this the way its ment to be?
    Last edited by Cherza; Mar 10, 2018 at 07:27 PM. Reason: Mistakes with phone

  2. #2
    May 2010
    White Plains, New York
    Minelab GPZ 7000; Equinox 600 -- Teknetics EuroTek PRO -- Grave Digger Tools Nemesis shovel, Sidekick hand digger -- Bunk's Hermit Pick
    24470 times
    Metal Detecting
    Honorable Mentions (1)
    Your threshold should be consistent. A steady, audible "zzzzzzzzzzzzzzzz" in your ears. Slight “Positive” signals are also called “whisper” signals. This is a very soft or slight, almost unnoticeable, rise in the threshold signal. It will always be repeatable over the target – not random. If your threshold is set too high, or too low, you can miss them easily. If your threshold is not smooth you can miss these whisper signals easily. There can be a couple of reasons, including EMI, for an unstable threshold. The most common is too much pulse width. Sometimes you can max it out, sometimes you can only run it at 50%. It depends on the beach. If you want to make your machine more sensitive and cut down on interference, make sure you are not wrapping your coil wire close to the coil down on the lower plastic rod. “Negative breaks,” are also referred to as whisper signals. This is when the threshold gets quieter, or goes away completely over the target. Again, negative breaks are always repeatable over a real target – not random. As you remove a little sand from over the target and re-sweep with your coil, the signal becomes a slight or stronger positive signal. Hope this helps!

  3. #3
    Feb 2017
    Minelab Etrac Garrett seahunter mk2
    32 times
    All Types Of Treasure Hunting
    Thanks Terry.
    I might try it again tomorrow just in case its emi.
    Allot of our beaches have houses right in front of the beach.
    I noticed the threshold goes just before I hit a target and I cant hear it for a bit.
    Sounds like it might be just the way they work
    Terry Soloman likes this.

  4. #4
    Jul 2008
    92 times
    In the suburbs or close to power lines with our mains power the audio in Standard Trash Elimination will undulate badly.



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