Coil question

[duclaw]

Can someone tell me what "DD" stands for with certain coils and what makes them different from those without it? Thanks.

 

[cx3]

A DD coil only detects with a narrow strip down the center of the coil the detection pattern is similar to a knife blade, a DD coil works better in hot ground because it does not see as much ground and is less affected my mineralization. A concentric coil on the other hand uses a round signal which is the size if the coil the detection pattern is cone shaped as it enters the ground and the deeper it goes in the ground the smaller the detection pattern. Also concentric coils see more ground and are affected more by mineralization. Usually a concentric coil will git a little more depth than a DD coil of equal size.


Jerry Murphy

 

[duclaw]

Thanks Jerry, that helps out a lot. I have been using an XLT with the standard coil for years now and feel that I know my way around it pretty well thus getting max performance from it. With that said, my V3 is due in tomorrow or Tuesday and I can't wait to get out there with it. In your opinion(or any of you other "experienced" V3 users) is there going to be a huge learning curve going from the XLT to the V3? The one thing that worries me a bit is how many posts I see here re: how hot or "noisy" the V3 is. Am I worrying too much?

Jim

 

[cx3]

Jim I had both the XLT and the DFX and in my opinion there is a slightly greater learning curve with the V. My biggest challenge was making changes to programs thur the expert menu, this can be quite involved. The V3 in my opinion offers much better performance than the XLT and the DFX, the depth of the V3 is outstanding. I have read the owners manual severl times and usually I will glance over it on a nightly basis especially if I want to clarify something. The owners manual is well written and informative, but is a little vague in some areas. My advice would be, stay with the factory pre-set programs until you become compfortable then experiment with adjustments that could boost performance, such as RX gain Motion sensitivity and All metal sensitivity. If you have questions several of the members on this forum are very qualified to help you and even a representive with Whites occasionly offers advice. Best of luck.


Jerry Murphy

 

[duclaw]

Thanks again Jerry. I've been reading over the manual and trying to absorb as much as I can from this forum. Your take on the machine sounds sensible to me and I know from experience on the XLT forum not to believe all the negative concerns about the operation of the machine. I know many people that think the DFX and XLT are "too complicated", but I find them perfectly suited to the person that wants more than just a turn-key machine. I know after just a few months of playing with the XLT things really made more sense and I suspect the V3 will be no different. Should be here today! Once I get some time under my "trowel" I'm sure I'll have some questions and hopefully a little insight too!

Jim

 

[Schrecky]

I'm sure glad I had good grasp on my DFX before I got the V3. There is a lot to learn, definitely not a beginners detector. Let us know how you are making out with it.

 

[Monte]

DD stands for Double-D, and is also commonly referred to as a "Wide-Scan" design. This is compared with the Concentric design of the standard 950 of your XLT.

Due to the shape of the Transmit and Receive windings in the coil, they appear similar to a letter 'D' and a reverse 'D' with the slightly not-so-straight sides overlapping. This design creates a responsive area that is narrow, front-to-rear, and thus the name "Wide-Scan" because is scans a wider swath on the side-to-side sweep.

The Concentric design doesn't really transmit a 'V' shaped signal. The reference to a 'V' is really a reference to the more reactive portion of the electromagnetic field on a side view. With the D-D design, a side view would suggest more of a bowl shape. With both coils, the deepest detection signal response will be in line with the center of axis of the search coil.

Now, for the XLT and other models, to include the V3. The XLT is, in my opinion, is a very good detector once you settle on 1 or 2 or 3 custom programs that fit the types of hunting you plan to do. I am not a fan of radically goofy settings. With my three preferred XLT custom programs I simply select the one I feel best suited to a site. One that uses the 6

 

[duclaw]

VERY helpful Monte...thanks!