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Johnny Crunch

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Posts posted by Johnny Crunch

    Interesting Hunt Conditions And Another Lesson Learned

    in Metal Detecting For Coins & Relics

    Posted

    Enjoying this investigation thread immensely! Particularly amused with the mental image I have of a bunch of prohibition drunks discharging weapons at the dance hall parking lot; then the WPA re-uses the contaminated gravel on the creek trail! But seriously I'm closely following the various settings adjustments, and your result reports, as someday soon I hope to afford a Nox 800... I agree: 'Where are the damn coins?'

    • Like 1
    • Haha 2

    Coil Frequency

    in Metal Detector Advice & Comparisons

    Posted

    If it's anything like antenna design, it's probably a trade-off between broadband (multi-freq) and sharply optimized (single freq). Perhaps an analogy is photographic Zoom lens vs Prime lens. Zoom is flexible; Prime lens can only do one focal length, but is unsurpassed for sharpness. Maybe an EE or coil designer can correct my [mis]conceptions...

    • Like 2

    Need Advice To Repair Detech 7" DD Coil Cable (used With MX Sport)

    in White's Metal Detectors

    Posted

    The coil cable has developed what I think is a discontinuity on one or more wires at or in the molded plug. Plug says: "Amphenol". There are 8 conductors. Does anyone here know the part number for a replacement plug to fit the jack on the rear of the MX Sport control box? 50 years ago I soldered a shortwave radio kit together; I'm quite rusty, but perhaps I could solder a new plug on (doesn't NEED to be waterproof). TIA!

    English Gold

    in Metal Detecting For Jewelry

    Posted

    2 hours ago, GB_Amateur said:

    Silver, gold, and old coins -- I'd call that a successful hunt!  On the bottom row I recognize four Wheat pennies but what is the fifth coin/relic/??

    I can just make out the O from ONE CENT on the crusty coin; thinking all five are wheatys.

     

    Jim in MA: Congrats on a wonderful excursion! Any interesting coin dates?

    • Like 1

    Detector To Sweep For Needles

    in Metal Detector Advice & Comparisons

    Posted

    1 hour ago, kac said:

    Will the needles stick to a magnet? Some stainless has too high nickel amount in them and won't stick. Just about any detector with a small coil should work fine.

    That's what I was thinking-- some SS alloys are non-magnetic. I just tried two different sized medical needles (tiny insulin and a big scary one) and each was only weakly attracted to either a one inch cube (25mm) or a 8mm cube neodynium magnet... Certainly not attracted enough to yank it out of the soil, even roto-tilled soil! The magnets would pick them off the surface, surely; but at that point, you might as well use a pliers, if you can see 'em. I have metal detected pins and needles and tiny ball bearings before, so maybe OP could get by with just a pin-pointer? They could get a very good quality pin-pointer for the price of a craptastic metal detector...

    • Like 3

    New Minelab Silversaver Metal Detector

    in Minelab Metal Detectors

    Posted

    On 7/31/2020 at 8:13 PM, Tom Slick said:

    Well, They said they were working on five new projects. This series is probably four of the five. I'm going to go out on a limb here and guess number five will be a detector that can find and trace those tongue studs that people swallow as they pass through the GI tract. 

    StudSaver!

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