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-   -   DD vs Concentric coils? (https://metaldetectingforum.com/showthread.php?t=276502)

tag1260 09-09-2019 09:32 PM

DD vs Concentric coils?
 
What is the difference between a DD and a Concentric coil? And is there a specific purpose to each?
Thanks

Stiffwrists 09-09-2019 10:13 PM

4 Attachment(s)
I've always used a DD. Heres a few pictures.

KOB 09-09-2019 10:22 PM

Quote:

Originally Posted by Stiffwrists (Post 3146306)
I've always used a DD. Heres a few pictures.

Very nice examples and pictures of coils. Thx

MuddyMo 09-10-2019 09:57 AM

I find the following to be true most of the time:
DD coils have more of a half football fov than a knife blade
DD coils separate better in one direction- when target to trash is is in a line from left to right
DD coils work better in high mineralization
CC coils go deeper but swings need to be overlapped by 1/3 of coil diameter
CC coils can separate deep targets better
CC coils ID more accurately- bottle caps etc
CC coils detect coins on edge better when swinging over the coins from edge to edge

tag1260 09-10-2019 10:37 AM

Thanks. It appears there are differences in when you would use each. Will either type work on a given MD if they're available?

ghound 09-10-2019 12:35 PM

I'd beg to differ on a few of these, in mild soil a cc can match a dd on depth, but not in mineralized soil.
A cc used to detect coins on edge better, but dd+higher freqs and multi freqs namely the Nox have balanced that.


Quote:

Originally Posted by MuddyMo (Post 3146431)
I find the following to be true most of the time:
DD coils have more of a half football fov than a knife blade
DD coils separate better in one direction- when target to trash is is in a line from left to right
DD coils work better in high mineralization
CC coils go deeper but swings need to be overlapped by 1/3 of coil diameter
CC coils can separate deep targets better
CC coils ID more accurately- bottle caps etc
CC coils detect coins on edge better when swinging over the coins from edge to edge


MuddyMo 09-12-2019 11:39 AM

Quote:

Originally Posted by ghound (Post 3146456)
.......
A cc used to detect coins on edge better, but dd+higher freqs and multi freqs namely the Nox have balanced that.

Not even the magical nox can make a DD as good as a CC at finding coins on edge in both directions. 3:00 into vid.
https://m.youtube.com/watch?v=ISiZGsp4OUo


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