Anybody use the 18.75 kHZ concentric coil on their XT-70?

[Canewrap]

I'm trying to decide on another coil to add to the ones I have (6" HF DD, 10.5" MF, stock) and was wondering if anybody has tried the high frequency concentric coil for general hunting?

 

[JohnA]

like it a lot. Also have the 6" HF and 5X10 coils and it compares very well with those. Separation is better with the 9" than the 5X10.

 

[nero_design]

JohnA: I think the reason why separation is better is that the emission field on the 5x10" DD HF Elliptical is kind of a "large, fuzzy blob" rather than a razor-sharp blade (such as on the 6" DD HF coil). The cone shape of the Concentric is going to allow for slightly better separation by comparison.

I like the ellipticals but I think coin hunters might get a bit more depth (however slight) with a concentric coil. I'm not sure that discrimination is as good though. Any thoughts?

Cheers,

Marco

 

[Jackpine Savage]

The seperation and sensitivity to small stuff may be better but round coils, whether concentric or DD designs, are much deeper. DD's get a bad rap from some people on discrimination but I never found that to be true.

Tom

 

[khouse]

It looks to me that your already set up for general hunting with your existing coils.

 

[Digger]

I have all three 9-inch concentrics and frankly, I can't see any difference in detection depth or separation characteristics. It might be a bit more sensitive to smaller targets. But when I have to lower the sensitivity setting to keep it from chattering, what is the point in being more sensitive? I do, however, see a difference in the manner each coil responds to certain targets. For example, the 3 kHz coil gives me a distinct audio "bark" on deeply buried iron. Iron that typically sends a "dig it" type signal. On the other hand, the 18.75 concentric seems to be particularly "hot" on lower conductive targets such as can slaw and aluminum screw caps. Not that you won't find your share with any frequency coil. But the higher frequency provides a tone on those targets that is hard (at least for my ears) to tell the difference. In my opinion, for "general hunting" you have the three best options. If you have that "gotta have another one" thing going on, and you hunt old farmsites or homesteads, consider that 9-inch at 3 kHz. It and the 6-inch DD are my two favorite coils. JMHO HH Randy

 

[JohnA]

regarding the many coils. The 3 kHz nails the high clad and silver and is awful on 20 numbers and below but nails iron and that is why Digger likes it in iron infested areas.The 18.75 concentric is a lot more solid on the higher number targets than the 3 kHz is on low positive to around 20 and absolutely nails nickels, so I am going to use it as my park coil this winter before I pull out the 6" high frequency coil to dissect an area.