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Thread: Size discrimination with Pulse Induction machines?

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  1. #31
    us
    Mar 2003
    Oregon
    Custom Designs and Prototypes
    1,224
    248 times
    All Types Of Treasure Hunting
    Quote Originally Posted by Tom_in_CA View Post
    I remember my old 66TR could do that. In theory anyhow. But didn't see much use for it. I was looking for metal (coins etc...) not voids in the earth.
    Not just voids, but ground disturbances and soil compaction. Tim Williams makes an add-on called the Arc-Geo Logger that can map the ground response and plot it in 2D, but requires the TR (cave) mode.

  2. #32
    us
    Nov 2011
    1,797
    381 times
    All Types Of Treasure Hunting
    Less than worthless means you might think it is working but it's not picking up the target. Not even what i would call highly mineralized ground.
    motherlode77 likes this.
    Ouija Board and map dowsing , one and the same. Just tape a map onto the Ouija Board and you have map dowsing.
    Works great if you like wild goose chases and snipe hunts!

    My new motto: L-rods are obsolete.

    Like Cappy sings with his harmonica, "We're all gonna die, but not tonight."

    May you never take one single breath for granted.

  3. #33
    Charter Member

    Jun 2017
    29
    7 times
    All Types Of Treasure Hunting
    Quote Originally Posted by signal_line View Post
    Less than worthless means you might think it is working but it's not picking up the target. Not even what i would call highly mineralized ground.
    Signal, I see what you mean now. My hope is still that I will find it with this unit, as it WAS picking up my buried test targets really well. But of course, if I go over the ground with this thoroughly and don't find it, then I will be disappointed in its abilities, as I am 90% certain of this cache still being there, and 100% on the location. Someone had said to expect less depth on actual gold targets vs. copper tests, is this true, and if so why? Also, something I noted was that iron was giving a stronger signal that aluminum or copper. Seeing as aluminum and copper are more conductive by far, why would this be the case?
    Last edited by motherlode77; Apr 15, 2018 at 01:50 PM.

  4. #34
    hr
    Mar 2017
    Croatia
    gpx 4800, tdi pro, sov gt/xs, sand shark 10.5''
    75
    26 times
    All Types Of Treasure Hunting
    i know with my gpx and stock dd coil a large piece of iron like my shovel gives a great booming sound with iron reject on, since you still need a detector that won't completely discriminate iron since you said the object is a steel pot, if i were you i would borrow a gpx with dd coil to test out your situation. i would get a few iron and steel pots and bury them from 2-4 feet down and on top of the soil to 5 inches down sprinkle on some nails and rusted bits or the small bothersome metals you have already found. Then test the gpx in iron reject mode, i would also test the detech ultimate 15'' dd as i heard it might discriminate a little better- don't know but just test a gpx with different dd coils, i think coiltek has a 20*40'' dd coil for gpx, might even test out a garrett atx with dd coil with iron reject- don't know, guess you should borrow and try different detectors... i could probably test out my gpx 4800 with its stock dd coil for you by making a similar situation in my yard ... post here or pm me the general size/dimensions of the steel pot object, i'll find a similar one in my garage and bury it down 3 ft and send a picture of the bad metal pieces you already found, or i could just throw on top some nails and small rusted metals then go over it with gpx in different iron settings to see if it works...

  5. #35
    hr
    Mar 2017
    Croatia
    gpx 4800, tdi pro, sov gt/xs, sand shark 10.5''
    75
    26 times
    All Types Of Treasure Hunting
    an idea popped into mind i just went and air tested my tesoro vaquero with stock 8*9 coil on a hollow steel cooking pot size 5*8 inches, put the sens to max and disc at 3 o clock position and tested a variety of small metal objects. About 90 percent were disc'd out and the hollow pot was coming in at 25 inches in the air, who knows maybe all you need for the job is a tesoro?
    motherlode77 likes this.

  6. #36
    us
    Nov 2011
    1,797
    381 times
    All Types Of Treasure Hunting
    Quote Originally Posted by motherlode77 View Post
    Signal, I see what you mean now. My hope is still that I will find it with this unit, as it WAS picking up my buried test targets really well. But of course, if I go over the ground with this thoroughly and don't find it, then I will be disappointed in its abilities, as I am 90% certain of this cache still being there, and 100% on the location. Someone had said to expect less depth on actual gold targets vs. copper tests, is this true, and if so why? Also, something I noted was that iron was giving a stronger signal that aluminum or copper. Seeing as aluminum and copper are more conductive by far, why would this be the case?
    I used to know but my memory is failing. If I tried to answer I'd probably be wrong and i don't feel like going and looking it up. If you are really interested there are articles on the internet about metal detector technology. Or Carl has a book on detectors. I don't know, for some reason people refuse to read as much as they can about it. That's not how you get ahead. I guess they think the knowledge will just come to them through the air. I'm not telling you what Clive has in his books.
    Ouija Board and map dowsing , one and the same. Just tape a map onto the Ouija Board and you have map dowsing.
    Works great if you like wild goose chases and snipe hunts!

    My new motto: L-rods are obsolete.

    Like Cappy sings with his harmonica, "We're all gonna die, but not tonight."

    May you never take one single breath for granted.

  7. #37
    Charter Member

    Jun 2017
    29
    7 times
    All Types Of Treasure Hunting
    Quote Originally Posted by signal_line View Post
    I used to know but my memory is failing. If I tried to answer I'd probably be wrong and i don't feel like going and looking it up. If you are really interested there are articles on the internet about metal detector technology. Or Carl has a book on detectors. I don't know, for some reason people refuse to read as much as they can about it. That's not how you get ahead. I guess they think the knowledge will just come to them through the air. I'm not telling you what Clive has in his books.
    For the sake of keeping this forum clean, I'm not going to reply as I am inclined to, but will remain civil.

    I have been doing little but reading up on metal detectors and geophysical equipment in my spare time the last couple years or so, it just so happens that finding information about such things is pretty closely guarded, or just so niche that it is rare. I didn't know that Carl had a book, how would I know that, osmosis? As for Clive 's books, you've just suggested that to me about a day ago, so that's not enough time to even ship it to me, let alone get into it. Add to that the fact his book is geared specifically for beach hunting, which is far different from what I am doing, and that's why I haven't bought it yet. I have no idea why you are insinuating I refuse to do research.

  8. #38
    Charter Member

    Jun 2017
    29
    7 times
    All Types Of Treasure Hunting
    Quote Originally Posted by signal_line View Post
    Less than worthless means you might think it is working but it's not picking up the target. Not even what i would call highly mineralized ground.
    Signal, Clyde's "Pulse power" book, I know you said you won't tell me what's in it, but can you give me some reasons for buying it? I'm not hunting beaches, how would it be relevant to my search?

  9. #39
    us
    Nov 2011
    1,797
    381 times
    All Types Of Treasure Hunting
    Ah, save your money.
    Ouija Board and map dowsing , one and the same. Just tape a map onto the Ouija Board and you have map dowsing.
    Works great if you like wild goose chases and snipe hunts!

    My new motto: L-rods are obsolete.

    Like Cappy sings with his harmonica, "We're all gonna die, but not tonight."

    May you never take one single breath for granted.

  10. #40
    hr
    Mar 2017
    Croatia
    gpx 4800, tdi pro, sov gt/xs, sand shark 10.5''
    75
    26 times
    All Types Of Treasure Hunting
    if each bottle holds smaller nuggets(don't know)...maybe applies similar to gold chain theory, then maybe a higher frequency vlf with bigger coil for depth with some discrimination would work. maybe read more into tesoro lobo, maybe even equinox 800 would work the best?

    Why Can’t My Detector Detect A Gold Chain?
    Gold chains are very difficult to detect, particularly very fine chains. Each link of a chain can be very small and the detector sees each link as a separate target, so it can easily be missed. You are more likely to detect the actual clasp or any pendants that may still be on the chain as these are much larger than the individual chain links. High frequency detectors such as the Eureka Gold, or an X-TERRA 705 with an 18.75 kHz coil in prospecting mode, will often pick up fine chains better than most coin detectors.

    https://www.minelab.com/knowledge-ba...sked-questions

 

 
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