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10.5 DD Xterra concentric coil :detecting:

khouse

Active member
Tell me your success with it and the best way to pinpoint with it? How accurate is the pinpoint and is there a big difference on shallow and deep targets? How much heavier is this coil over the stock 9 inch coil? Thanks!
 
Great coil, the weight does not bother me, I can swing it in the woods for a couple of hours. On a DD the center strip reads the target, front to back. When I get a target I usually don't use the pinpoint mode, I just wiggle the coil backwards until the signal drops off. Then I dig right at the tip of the front of the coil and there it is!
I highly recommend this coil especially if your ground is mineralized. DD's work better in that soil.
 
I'll second what Jeff said about pinpointing, it's easy once you get used to it. When you first put the coil on, the machine seems a little unbalanced after the stock coil, you will get used to that also. The 10.5 is my main coil as it gives more ground coverage lengthwise and sees a smaller slice of ground, therefore less processing by the machine. There is a good reason why they are standard issue on the Explorers and some of the Fishers and other machines. By the way, I noticed in your title you called it a DD concentric coil. It's just a DD, the stock coil is concentric. Ron
 
For the record..... in the world of metal detector coils, the terms Concentric and Double D represent an electronic design. Not a shape. Depending on the make and model, both concentric and DD coils found in either round or elliptical shapes.
In the X-Terra lineup, the 10.5 DD coils are round, the 9-inch concentrics are round, the 6-inch DD and 6-inch concentrics are round and the 5 X 10 DD is elliptical. HH Randy
 
By me saying concentric DD coil kept people thinking that I might have been talking about the 5x10 DD elliptical coil. To me round is the same as concentric. But I guess I should have said 10.5 inch round DD? My bad.
 
Kenny.
They are both good coils. The DD coil is a little more sensitive than I expected and will give more ground coverage at depth than the concentric, but will only hit a coin to a depth of around 8 inches (according to my experiments on a beach). The single biggest difference though, has to do with gaining target feed back.I find that the VCO response is better on the concentric, as that helps me figure out screw caps a bit better, but the big one is the pinpoint fade. Just like on the Ace, that is a major discrimination tool, and the DD coil doesn't have it. If you are beach hunting and want cover a lot of ground, then the DD is a good call, but if you want that target information, then stick with the standard coil.
Mick Evans.
 
khouse... let me try ... In your example.. the opposite of elliptical is round.

Concentric coils basically means there are two coils with the same center. In a concentric coil, there's a sending coil and a receiving coil (someone correct me, if I'm wrong).

I'll try to find a description, with pictures, somewhere on the net and include a link.

About pinpointing...

There is another way to pinpoint with a DD coil. I use it most of the time. That is to tip the coil up on end and point the "nose" of the coil straight down at the target. The coil will send a very narrow signal from the nose or heel of the coil.

Hope I explained that clearly.

Bob
 
Thanks Mick. I am thinking of getting the 6 inch dd coil. I should be able to figure that coil out pretty easy.
 
The 10.5 DD 7.5 Coil is hands down my choice for Relic Hunting. I have a Most X- Terra coils starting with standard coil 9 inch 7.5 KHz 9 inch 3-KHz, 5X10 Elliptical 18 KHz. I switch to 10.5 DD and went back sites and found few super deep targets that other coils missed. The Larger coil size and DD design is just goes little Deeper. I would love see Minlab make an 10.5DD 3 KHz coil for all Relic Hunting In USA, The depth would be scary!!
 
I know the shape and design of the concentric transmit and receive coils. I also know DD coils come in elliptical and round shape. I know what your talking about as concentric coils have the same center point and circular. So I just looked at the 10.5 dd coil as round therefore I called it concentric. But yes, If you take the d shaped windings themselves they are not concentric. I stand corrected. I have been so used to calling round shaped coils concentric for 24 years that my brain just automatically thought concentric. I'm just not used to seeing round dd coils. :surrender:
 
Khouse.... I'm just starting to use the DD coils myself.. Historically, I've only used CC coils. I was out yesterday with my 18.75 kHz 5 X 10" DD coil. The more I use it, the more I like it. I have a 6" DD coil in route now and can't wait to get that one. Most of the areas that I have been hunting around here are mineralized and somewhat "trashy".

Try that pinpointing method that I mentioned above. For me, I think it works better than any other method with a DD coil.

Good luck,
Bob
 
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