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  #1  
Old 09-09-2019, 09:32 PM
tag1260 tag1260 is offline
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Default DD vs Concentric coils?

What is the difference between a DD and a Concentric coil? And is there a specific purpose to each?
Thanks
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  #2  
Old 09-09-2019, 10:13 PM
Stiffwrists Stiffwrists is offline
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I've always used a DD. Heres a few pictures.
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  #3  
Old 09-09-2019, 10:22 PM
KOB KOB is offline
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Originally Posted by Stiffwrists View post
I've always used a DD. Heres a few pictures.
Very nice examples and pictures of coils. Thx
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  #4  
Old 09-10-2019, 09:57 AM
MuddyMo MuddyMo is offline
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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

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  #5  
Old 09-10-2019, 10:37 AM
tag1260 tag1260 is offline
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Thanks. It appears there are differences in when you would use each. Will either type work on a given MD if they're available?
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  #6  
Old 09-10-2019, 12:35 PM
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ghound ghound is offline
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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.


Originally Posted by MuddyMo View post
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
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  #7  
Old 09-12-2019, 11:39 AM
MuddyMo MuddyMo is offline
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Originally Posted by ghound View post
.......
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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