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concentric vs DD on bottle caps and coins
Posted by: asiandigger
Date: June 29, 2017 10:39PM
Want to ask you MDs out there what you guys /gals think, I personally think the DD is better, but there's MD out there that said the concentric is better in trashy area and can identify bottle caps better than DD, and said that DD reads bottle caps as coins,

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Re: concentric vs DD on bottle caps and coins
Posted by: mrwilburino
Date: June 29, 2017 11:16PM
DD's offer better target separation, so they would be my first choice for hunting trashy sites. However there are some things that a concentric will see better than the DD, so not a bad idea to use both at the same site if you have them. Concentrics are generally better than DD's for identifying steel (crown) bottle caps. For the DD's though, it depends on the machine. Bottle cap ID's can be anywhere from excellent to exasperating. There are tricks that you can use with DD's to increase ID accuracy on bottle caps.



Fisher Teknetics XP Minelab

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concentric vs DD on bottle caps and coins
Posted by: vlad
Date: June 30, 2017 01:39AM
In general concentrics are quieter, disc better (better bc killers) and are deeper, and I've been doing this for 42 years (longer if including the military-but circumstances were different.)

Re: concentric vs DD on bottle caps and coins
Posted by: Flintstone
Date: June 30, 2017 08:21AM
Quote
vlad
In general concentrics are quieter, disc better (better bc killers) and are deeper, and I've been doing this for 42 years (longer if including the military-but circumstances were different.)
I HOPE YOU DIDN"T MISS MANY TARGETS WHEN YOU FIRST STARDED!!!!!!

Re: concentric vs DD on bottle caps and coins
Posted by: TellYaWhut
Date: July 20, 2017 11:17PM
My choice is to use one detector that allows both type coils or two seperate metal detectors . I have used some high end detectors using only DD coils and then was shocked when I used a cheaper model only having a concentric coil..... pulling CW bullets from iron in the same exact location. The DD is great for high mineral soil and allows better coverage with each sweep. Concentric coils have better pinpointing, correct ID, deeper depth (size per size), and better screw cap rejection. As far as unmasking good targets in iron depends on what model detector your using and size of coil. I prefer the 8x6 SEF DD coil, but lets face it one coil will not cover every application.

I like the small concentrics in trash..
Posted by: pinenut
Date: August 01, 2017 04:49PM
Quote
asiandigger
Want to ask you MDs out there what you guys /gals think, I personally think the DD is better, but there's MD out there that said the concentric is better in trashy area and can identify bottle caps better than DD, and said that DD reads bottle caps as coins,

In trashy spots, small concentrics every time...for me, anyway. Only places I prefer DD's are wide open areas with few targets, where I run minimal disc and plan on digging everything that sounds good. On any of my Tesoros, even those best at ignoring small iron, using a DD will have bottle caps not discing out 'till past the nickel range. No fun if you're wanting to find nickels (or small gold coins and jewelry) around nails or bottle caps.

Aside from requiring less frequent GB adjustment in highly mineralized ground, the only real advantage I see to a DD is better area coverage. Better discrimination and precise pinpointing always goes to the concentric, at least on my Tesoros.

I hunt some trashy places, so prefer concentrics 90% of the time, and I have both types of coil in several sizes.

Rather than just reading what others say about each type coil though, I urge you to try both types yourself and see what works best for you, in your soil and on your detectors.



one more wheatie..

Re: concentric vs DD on bottle caps and coins
Posted by: Doctorcoinz
Date: August 08, 2017 11:25AM
The cone shaped tip of the electromagnetic field from a small concentric can winkle coins and rings out of deeper trash better , much better...

Re: concentric vs DD on bottle caps and coins
Posted by: Dan-Pa.
Date: August 09, 2017 09:44AM
Depends on the unit....Minelab and their Explorer series have no problems with the rusty bottle cap...

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