You are viewing this forums as a guest which limits you to read only status.
Only registered members may post stories, questions, classifieds, reply to other posts, contact other members using built in messaging and use many other features found on these forums.
Why not register and join us today? It's free! (We don't share your email addresses with anyone.) We keep email addresses of our users to protect them and others from bad people posting things they shouldn't.
Seems like many of the new Hot machines all have DD coils now. The G2, T2, ATPro, AT Gold, Xtera 705... With today's technology will mono coils be a thing of the past? The new DD coils cover ground better while seeing less of the mineral matrix. As an example the new Garrett blunt-nose 11" DD coil is fantastic! Great depth and target separation. Plus the pin point mode (ATPro) is spot on for a DD coil! Even the smaller DD coils seem to perform. Why bother with a mono?
the concentric coils get better depth and discriminate better than the DD coils. Why do you think they put those big assed DD coils on the new detectors?? To make up for lost depth. The DD coils main advantage over a concentric coil is in mineralization, other than that a concentric coil will trump
a DD coil. Pinpointing is more precise with a concentric coil also. Concentric coils have worked fine for me for over 30 years and I won't be switching anytime soon.
the concentric coils get better depth and discriminate better than the DD coils. Why do you think they put those big assed DD coils on the new detectors?? To make up for lost depth. The DD coils main advantage over a concentric coil is in mineralization, other than that a concentric coil will trump
a DD coil. Pinpointing is more precise with a concentric coil also. Concentric coils have worked fine for me for over 30 years and I won't be switching anytime soon.
I believe there are advantages and disadvantages for both coils. I use both types of coils for different situations. As for pinpointing with a DD I never had a problem. I use a small 6 inch DD and pulled up coins from 8 inches.
I've had good results with both types, but everything I've read favors the concentrics for depth and discrimination when comparing like sizes in typical, not highly mineralized soils. That said, I've become rather fond of the elliptical shaped DDs as they cover more area in the long dimension and often you can work the tips into tighter places than a round concentric. In my own experience, I've gotten good depth with a 6X10 DD and surprising depth (for its small size) from a 4X6 DD. Not necessarily better or even quite as good as a similar sized concentric, but definitely very usable.
BB
I will agree, there are advantages and disadvantages with both coils. In my low mineralized soil the concentrics work fine. A buddy had a 8 1/2" DD Tesoro coil he wanted to sell. I took it for a test drive on my Silver
Still, many manufacturers are offering DD coils as stock these days. That seems to be a trend? Perhaps technology has surpassed the mono coil somewhat? As an example I think of my new to me Fisher CZ70 Pro with 8 mono as a hot machine. Mainly based on CZ reputation. Yet it does not seem to be as hot as my new Garrett AT Pro with 8.5X11 DD coil. The ATP seems to beat it in the air and in my somewhat difficult ground. OK the coil is larger, but the ATP hits harder on small gold nuggets even when the CZ is maxed out in auto tune. In disc mode the ATP locates known targets in half the time, as the CZ mono coil needs to be overlapped more. The ATP DD coil pinpoints just as good as the CZ mono, perhaps better. I bought the CZ to use for salt beach hunting, but now wish Fisher had made some DD coils for it.
How would mono coils offer better discrimination? What about the larger detection pattern of the mono coil? I would think multiple targets under a mono coil would throw the discrimination off? (target masking) Perhaps in field conditions I'll find mono coils work better? My CZ will be perfect for that test. So far in my yard I find more targets with DD coils. The 2 exceptions are when using my Infinium with 8 or 14 mono coils, or when using the CZ70/8 mono in the all metal auto tune mode. There seems to be a wider detection field with monos in am mode? From the few tests I've done, the only way the CZ can keep up with the ATP in my yard is, if I hunt with the CZ in auto tune, hit a target, then check target ID in discriminate. I can find targets faster in the am auto tune mode with the CZ. I find targets faster with the ATP in disc mode!
That's what got me wondering about all the DD coils offered as stock on many general use detectors and if the DD coil is a better all-around treasure finder today? I will have to confirm in actual hunts, but so far from what I've seen, I would grab a DD coil for a hunt. I've got the impression that the latest DD coils cover more ground, have better target separation and penetration in hot ground, seem to go just as deep or deeper and are very sensitive to small targets, such as gold nuggets? How could an older technology mono coil match that? I've always been told mono coils are more sensitive to smaller targets. But one has to see to believe how sensitive some larger DD coils are! The tiny targets my 15 inch DD WOT coil finds is amazing!
I know there are many here who prefer mono coils. I used to lean that way too. Perhaps coil choice is all hunt/conditions dependant? But just find an AT Pro to try with the larger DD 8.5X11 coil. You just might take a hard look at newer DD coils.
Still, many manufacturers are offering DD coils as stock these days. That seems to be a trend? Perhaps technology has surpassed the mono coil somewhat?
I think it's as simple as customers wanting DD coils rather than mono. And if you like DD better and have the choise between two very similar detectors where one comes with DD and the other with mono you would most likely pick the one with DD rather than having to get it on the side (for extra cash) with the other and have a mono coil you don't use. If the manufacturers get asked again and again if a model could be fitted with a DD and feel that they are losing sale on using the mono, at some point the will just make DD standard.
If it would boost sales they would paint detectors pink. Wouldn't mean pink detectors where superior.
Btw, X-Terra 705 comes with a mono coil. They have just made a gold version with a small high frequency DD coil aimed at the gold prospectors. Preffered by others too, though.
