How get more depth??
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Thread: How get more depth??

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  1. #1
    it
    Oct 2013
    middle of Italy
    Garrett 250 & Exc. 10"
    21
    3 times
    All Types Of Treasure Hunting

    Question How get more depth??

    Hi everybody..

    I have already a new excalibur 10" coil, but i'd like to try again in a hole with another detector to get more depth, i was thinking to get a brand new mark 2.

    Is in your opinion see hunter good enough to gain from 2 to 4 inch in salt water condition??

    What detector would you use having already and exc.??

    Thanx to all...

  2. #2
    us
    Retired

    Apr 2007
    Zephyrhills Fl
    excel 1000 with 8 inch coil, Garrett AT MAX and a silver U MAX
    1,281
    1577 times
    All Types Of Treasure Hunting
    Banner Finds (3)
    Honorable Mentions (6)
    put a Watts coil on your detector, that should give you another 12"

  3. #3
    us
    Georgia Red

    Mar 2013
    Valdosta, GA
    Garrett ATPro- 8.5x11, 5x8, CORS Fotune 5.5x9.5 Tesoro Silver microMax- 8 donut, 8x11 RSD, 3x18 Cleansweep Minelab Excalibur ll- 10" Tornado Minelab CTX 3030 Minelab Xterra 305
    4,841
    2355 times
    All Types Of Treasure Hunting
    As Ron said the 15" WOT, 13" Ultimate or 15x12 SEF will increase depth but there are trade offs with these like weight, more drag and less stable in water. Hunting in PP mode gives quite a bit more depth also with the stock coil. The PP and headphone mod that OBN does makes the Excal a whole different machine. He sales the kit if you are capable of soldering, it's quite easy to do yourself because it's all ode from the too endcap side. I use the stock 10" tornado and pick up targets deeper than I can dig in wet sand.
    Last edited by Fletch88; Apr 06, 2014 at 04:43 AM.

  4. #4

    Jul 2012
    1,330
    513 times
    All Types Of Treasure Hunting
    Honorable Mentions (1)
    Why would increasing the diameter of the search coil increase your detection depth?
    It makes no sense from a physics point of view as you have to search a larger surface area under the coil
    without an increase in power from your detector.


    Quote Originally Posted by Fletch88 View Post
    As Ron said the 15" WOT, 13" Ultimate or 15x12 SEF will increase depth but there are trade offs with these like weight, more drag in water, and more unstable in water. Hunting in PP mode gives quite a bit more depth also with the stock coil. The PP and headphone mod that OBN does makes the Excal a whole different machine. He sales the kit if you are capable of soldering, it's quite easy to do yourself because it's all ode from the too endcap side. I use the stock 10" tornado and pick up targets deeper than I can dig in wet sand.

  5. #5
    us
    CASPER

    Jan 2012
    NEW ENGLAND
    WHITE'S XLT, PI PRO, GARRETT 2500, 3- FISHER CZ21s, JW FISHER 8X
    15,271
    15606 times
    All Types Of Treasure Hunting
    Banner Finds (1)
    Honorable Mentions (5)
    CZ21 in all metal like I do - I get goodies down 2 feet
    Motto = "I try to hit where others cant or others wont "

  6. #6
    us
    Jun 2009
    Oahu, HI
    White's, Garrett, Minelab
    241
    166 times
    Metal Detecting
    Why would increasing the diameter of the search coil increase your detection depth?
    It's a trade off. The larger coil generates a larger magnetic field that penetrates deeper but with less field density - the power output is the same as a smaller coil. Less field lines means less sensitivity but greater depth.
    Sir Gala Clad and lorraine like this.

  7. #7
    us
    Georgia Red

    Mar 2013
    Valdosta, GA
    Garrett ATPro- 8.5x11, 5x8, CORS Fotune 5.5x9.5 Tesoro Silver microMax- 8 donut, 8x11 RSD, 3x18 Cleansweep Minelab Excalibur ll- 10" Tornado Minelab CTX 3030 Minelab Xterra 305
    4,841
    2355 times
    All Types Of Treasure Hunting
    Quote Originally Posted by Jackalope View Post
    It's a trade off. The larger coil generates a larger magnetic field that penetrates deeper but with less field density - the power output is the same as a smaller coil. Less field lines means less sensitivity but greater depth.
    Jackalope, I think Sir Gala was pulling our leg about larger coil physics.

  8. #8

    Jul 2012
    1,330
    513 times
    All Types Of Treasure Hunting
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    Fletch: I am very serious in obtaining an explanation as to why increasing the diameter of a search coil increases the depth a target could be detected at with the same detector.
    Under the field conditions that I hunt under, I have not noticed a drop off in depth using a smaller coil.
    Quote Originally Posted by Fletch88 View Post
    Jackalope, I think Sir Gala was pulling our leg about larger coil physics.

  9. #9
    us
    Georgia Red

    Mar 2013
    Valdosta, GA
    Garrett ATPro- 8.5x11, 5x8, CORS Fotune 5.5x9.5 Tesoro Silver microMax- 8 donut, 8x11 RSD, 3x18 Cleansweep Minelab Excalibur ll- 10" Tornado Minelab CTX 3030 Minelab Xterra 305
    4,841
    2355 times
    All Types Of Treasure Hunting
    Sir Gala Clad, This has been covered many times on every forum on the net. Search TNet or google it and you can read dozens of different explanations on the physics involved. I did find this one particularly interesting from one of the founders of Minelab. Yes I confess to being brand loyal. Most of the time your exactly right an 8-11" coil will give plenty if depth and coverage for the average coinshoot or relic hunt, but on wide open beaches or fields I like a larger coil mostly for more coverage, but also more depth.
    https://www.minelab.com/__files/f/11...2520THEORY.pdf
    Last edited by Fletch88; Apr 07, 2014 at 06:35 AM.

  10. #10
    us
    Jun 2009
    Oahu, HI
    White's, Garrett, Minelab
    241
    166 times
    Metal Detecting
    Under the field conditions that I hunt under, I have not noticed a drop off in depth using a smaller coil.
    You may not notice it operationally, especially in iron soil that is attenuating the signal of the larger coil more than the smaller. But, the physics are the physics, which means the larger coil will drive deeper (all things being equal) but not have the sensitivity (to small targets) that the smaller coil will have. Most coin hunters are happy with getting coins at 7-9", which is within the range of most small coils, especially concentric coils in lightly mineralized soil. Within heavy junk and iron litter, the small coil will likely get the same depth with better sensitivity than the larger coil. At the beach, in light-moderate mineralization, the larger coil is going to get that deeper coin or ring, while missing the smaller jewelry and small iron trash. It's always a trade-off with physical laws.

    Jackalope

  11. #11
    us
    TerrysKnifeStore.com

    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
    17,102
    23655 times
    Metal Detecting
    Honorable Mentions (1)
    I sure am glad I have a pulse induction machine..

  12. #12

    Jul 2012
    1,330
    513 times
    All Types Of Treasure Hunting
    Honorable Mentions (1)
    Jackalope: What I am trying to determine is why increasing the size of the search loop increases detection depth. I suspect that a large part/ most of the answer is that larger coil size(s) allow further separation of the transmit coil from the receive coil which widens and deepens the detection field.

    This also explains why increasing the coil size of a monopulse coil (same coil is used for transmitting and receiving) used on Pulse Induction Detectors significantly increases your ground coverage with little if any increase in depth capability.

    Quote Originally Posted by Jackalope View Post
    You may not notice it operationally, especially in iron soil that is attenuating the signal of the larger coil more than the smaller. But, the physics are the physics, which means the larger coil will drive deeper (all things being equal) but not have the sensitivity (to small targets) that the smaller coil will have. Most coin hunters are happy with getting coins at 7-9", which is within the range of most small coils, especially concentric coils in lightly mineralized soil. Within heavy junk and iron litter, the small coil will likely get the same depth with better sensitivity than the larger coil. At the beach, in light-moderate mineralization, the larger coil is going to get that deeper coin or ring, while missing the smaller jewelry and small iron trash. It's always a trade-off with physical laws.

    Jackalope
    Last edited by Sir Gala Clad; Apr 08, 2014 at 05:26 PM.

  13. #13
    us
    Apr 2010
    SW Fla
    Garret Seahunter II/Bountyhunter/trident
    48
    1 times
    Just get a SeaHunter and dig till your arm falls off

  14. #14

    Jul 2012
    1,330
    513 times
    All Types Of Treasure Hunting
    Honorable Mentions (1)
    Yeah Just like in the Danced All Night Lyrics from My Fair Lady with a few changes for detecting:

    My head's too light to try to set my Sea Hunter down! Sleep! Sleep!
    I couldn't sleep tonight.
    Not for all the jewels in the crown!
    I could have dug all night!
    I could have dug all night!
    And still have begged for more.
    I could have spread my wings
    And done a thousand things I've never done before.
    I'll never know What made it so exciting;
    Why all at once My heart took flight. I only know when he
    Began to dig with me I could have dug,
    dug, dug all night with my Sea Hunter till my arms fell off!


    Quote Originally Posted by surfshark View Post
    Just get a SeaHunter and dig till your arm falls off
    Last edited by Sir Gala Clad; Apr 09, 2014 at 11:14 PM.

 

 

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