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Thread: large coil PI detectors

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  1. #1
    us
    point man

    Jul 2016
    sing sing N.Y
    433
    188 times

    large coil PI detectors

    ive seen 40"x40"rug coils used in the gold fields and in the philippines ....my question how large a coil would be needed to avoid all trash ....what i see 40"x40" is worthless in trashy areas ....my guess would be more then 10' x 10 ' ....the depth is not the problem am only interested in the top 2 feet of dirt .....what size coil would avoid all bottle tops and soda cans ..the target would be of gallon size or bigger ...?? any infor would be helpful

  2. #2
    us
    ARC

    Aug 2014
    De Tampe Bahia - La Florida
    JW 8X - ML X2
    18,082
    36749 times
    All Types Of Treasure Hunting
    "my question how large a coil would be needed to avoid all trash"

    Two words...

    "good luck".

    I am not sure that "bigger is better" applies to a coil avoiding trash.

    A soda can is gonna ring like a trash can and vise versa when searching for larger items... your not going to be able to discriminate moderate sized trash and a "chest of gold" so to speak.

    The only thing I can say is... your gonna have to dig it all... which... on the bright side...

    Will...

    Turn your little muscles...

    Into big muscles.
    Have permission... Fill holes... Dispose of trash. - The Random Chat Thread - AKA -" TNet Under Ground " http://www.treasurenet.com/forums/ev...l-welcome.html

  3. #3
    us
    point man

    Jul 2016
    sing sing N.Y
    433
    188 times
    AARC are u sure about that .... what i seen with a 40"x 40 " coil aluminum bottle caps are only seen in the first few inches of soil and a aluminum soda can on the wet salt sand beach 18" .....i never used or seen a 10 foot coil ...but a crushed soda can is what max 2 oz of aluminum there has to be a limit of how deep a larger then 10 foot coil could see it ....am not trying to discriminate ,,,, its like a coin machine finding a 1 gram nugget most machines the signal to weak so u just ignore it ...

  4. #4
    us
    ARC

    Aug 2014
    De Tampe Bahia - La Florida
    JW 8X - ML X2
    18,082
    36749 times
    All Types Of Treasure Hunting
    Well I happen to own a large coil...

    When I say larger lol... 24 x 48.

    Fisher Pulse skid... modified of course.

    I will hit on foil... soda cans... ANYTHING under it.... cans to even a propane tank at 3 + foot... SO.... I only speak / know... from my own personal experience with THAT coil.

    This coil... will also hit a cannon buried 12 foot under sand if set / conditions are right and it were to pass over it.
    Have permission... Fill holes... Dispose of trash. - The Random Chat Thread - AKA -" TNet Under Ground " http://www.treasurenet.com/forums/ev...l-welcome.html

  5. #5
    us
    point man

    Jul 2016
    sing sing N.Y
    433
    188 times
    the target minimum in weight would be 5 kilo to max 100 kilos ... so a bottle cap a few grams like a coin and the size of large coin and a soda can 1/75 the weight or less and 1/10 the size or smaller ...the area of a 10 foot coil is 125 x greater then 12" round coil .... to me maybe am missing something..... but something dosnt add up

  6. #6
    us
    point man

    Jul 2016
    sing sing N.Y
    433
    188 times
    AARC thanks for the information i dont know of any one that used bigger then 5 foot square maybe somebody has ....where am at the beach is a trash site so ill try anything

  7. #7
    us
    ARC

    Aug 2014
    De Tampe Bahia - La Florida
    JW 8X - ML X2
    18,082
    36749 times
    All Types Of Treasure Hunting
    Well here is some advice...

    IF you have a suspect spot... First "clean" area of all small stuff etc with regular detector / coil... removing any interference will increase your odds of "seeing" deeper etc anyway.
    Have permission... Fill holes... Dispose of trash. - The Random Chat Thread - AKA -" TNet Under Ground " http://www.treasurenet.com/forums/ev...l-welcome.html

  8. #8
    us
    point man

    Jul 2016
    sing sing N.Y
    433
    188 times
    AARC thanks for the ideas i was planning on either using the coil behind a 4 wheeler upland or from a flat bottom raft on the beach edge i see your from florida i guess u know the first 2 feet is what counts
    AARC likes this.

  9. #9
    us
    ARC

    Aug 2014
    De Tampe Bahia - La Florida
    JW 8X - ML X2
    18,082
    36749 times
    All Types Of Treasure Hunting
    Quote Originally Posted by MDCLXVI View Post
    AARC thanks for the ideas i was planning on either using the coil behind a 4 wheeler upland or from a flat bottom raft on the beach edge i see your from florida i guess u know the first 2 feet is what counts
    Actually...

    I will tell you atruth I realized young about beaches...

    They move... like the desert.

    Move as in... they are in a state of constant change.

    Which... is sort a frustrating and a liberating thing at the same time if you peer into the logic of my statement... heh

    So... Example...

    Walk out on patch of beach sand... work it hard.. nothing.

    Same EXACT patch... 2 weeks later... and its like 4th of July in your ears.

    So... with this in mind... you can safely ascertain that it MAY be there... and it MAY NOT... be the day.

    Follow ?

    That's why there is nothing like a good ole storm to "stir" things up and reshape the possibilities.
    MDCLXVI likes this.
    Have permission... Fill holes... Dispose of trash. - The Random Chat Thread - AKA -" TNet Under Ground " http://www.treasurenet.com/forums/ev...l-welcome.html

  10. #10
    us
    point man

    Jul 2016
    sing sing N.Y
    433
    188 times
    where am in negros i call it sand tide in one place i seen 1/4 mile of beach 6 feet deep going out in the sea removed by the current over a one year time period ......yes the beach moves like the dessert ....thank god one of my sites is in a bay area
    AARC likes this.

  11. #11

    Mar 2013
    61
    65 times
    All Types Of Treasure Hunting
    Well you got me. Looking for a lost car? HEHEHE! If your detector is digital with all sorts of bells and whistles, displays and touch buttons, it's probably mostly useless. This is how we did it back in the day. Get you a 1260X Fisher with dual discriminate. Replace the pots with precision 10 turn pots. Set the primary disc circuit at the edge of iron and steel. Once those are tuned out, hunt till you find a pull tab. Set the second disc just at the edge where it gets poppy but is still in. Hunt till you get a signal, pull the trigger to disc #2 and if the signal goes out you dig it!!! You see it is between iron and aluminum. That way you get all nickels and gold rings. If it's poppy, it's a pull tab. If it's a clear zip, it is a coin! An old man with an old analog 1260X will clean your tot lot pretty quick Just about as good at the beach!
    Gold Gold Gold Gold
    Bright and Yellow, Hard and Cold
    Molten, graven, hammered, rolled
    Heavy to get, light to hold
    Stolen, borrowed, squandered, doled

  12. #12
    Charter Member
    us
    Jul 2006
    Orlando, Fl
    Minelab_Equinox_ 800 Minelab_CTX-3030 Minelab_Excal_1000 Minelab_Sovereign_GT Minelab_Safari Minelab_ETrac Whites_Beach_Hunter_ID Fisher_1235_X
    37,119
    28779 times
    All Types Of Treasure Hunting
    This may be what you need.

    I have seen it work in person, 3 different karat gold rings had 3 different color shades too.

    https://www.kellycodetectors.com/cat...-standard-pack
    AARC and TheGreenBoy like this.
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  13. #13
    us
    point man

    Jul 2016
    sing sing N.Y
    433
    188 times
    Treasure hunter thank u for the ad and the video ....i guess u didn't understand what i was getting at ( thats my fault sorry ) ... i need something that covers lots of ground fast ...in aussieland guys use 40"x40" rug coils dragged behind 4 wheeler ...on the beach edge u can't dig deeper then 2 feet so the depth who cares ...right now am holding the coil 2 feet off the ground looking and still running into soda cans this is killing my back and takes lots of time which i don't have because of the tide ...this unit in the video to me looks like belongs in a hollywood movie and looks like it needs 2 people to operate at a quick pace its probably great in a clean area ..the funny thing i almost drowned due to the amount of garbage in the sea when swimming i was trapped in it..i made the tv news ..... clean white sand beach are for the tourists only not treasure hunting

  14. #14
    si
    Nov 2017
    Countryside
    DBP2010, eeTH
    22
    23 times
    All Types Of Treasure Hunting
    Well, i am using large 1.2m x 1m square coil on a deep seeking PI on a regular basis, looking for large militaria and underground objects such as bunkers, storage rooms and warehouses. The detector is capable to report large targets down to 4m, but with this settings it will react to small items too. So i usually set it up to ignore anything smaller than 0,5L beer can, it will still report large targets to 2m maximum - or multipe small ones covered with the coil, which should be resolved by different settings an by using smaller coil - i am using 38cm coil for that.
    The art of treasure hunting somewhad differs from regular metal detecting....
    MDCLXVI likes this.

  15. #15
    us
    point man

    Jul 2016
    sing sing N.Y
    433
    188 times
    Greenboy thanks for the info ...i guess if i got a 40x40 which is 4x the size of the coil i have now and did some fine tuning it would be possible ....thanks again

 

 
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