AT Pro 8.5x11 coil and depth

[OregonGregg]

Does the AT Pro do good with depth with the 8.5 x 11 coil and also how is the 9.5x12 concentric coil, which do you prefer.
I've been kicking around about getting one for this summer, I'll have opportunity to use in and around water. Thanks and HH
gregg

 

[Forrest Mc]

I don't use the concentric coil here in SW WA per advise of Garrett. A few years back, I called Garrett about the larger concentric coil for the AT Pro and their customer service lady advised against it. The reason being that the mineralized soil within the area of the the cone would mask the target. So, I didn't buy and I've never tried it. I've hunted with the 8.5 x 11 DD with good success on coins in parks and sports fields as well as river and ocean beaches. My deepest recovery with it was near 8" in moist soil.

Here is an interesting read from Garrett on coils - http://www.garrett.com/hobbysite/hbby_searchcoil_tech_sheet.aspx

 

[jim tn]

I can't speak for the 9.5x12 concentric, but if your ground is moderately or more mineralized, the DD is the way to go. About the deepest I have dug a dime is 8," but have dug a few 69 caliber 3 ring mini's at 9" and a bit more. And, it gets near astounding depth in beach dry sand, salt or fresh. HH jim tn

 

[OregonGregg]

Thanks guys, I think I'll stay with the standard 8.5 x 11 for the time being.

 

[Night Crawler]

Hi OregonGregg

I have never used the 9.5x12 concentric coil so I can't comment on it. The 5x8 Coil, I like in certian areas (personally speaking) and I have dug targets with a solid signal and VDI at 8 inches. As for the 8.5x11 coil, that's the one I use on a regular bases.

Here is a (snapshot) from a demonstration video I made for a friend of mine. That's a 7" high mineral rock (GB at 92) and I was picking a Canadian nickle up with a good signal that was under it at almost double the height using the 8.5x11 DD coil.

Pic:

 

[Night Crawler]

Sorry about that OregonGregg, I thought you were asking about the 5X8 coil as well, it was a long day when I made that post, so you can disregard it if you like.

 

[OregonGregg]

looks as if the AT Pro does a nice job.

 

[grumpysrb]

I got a 1979 Penney at 10 inches in very wet soil. Got a faint signal in one direction and nothing after a 90 degree turn. Buddy with a V3i got the same, so I dug it.

 

[Night Crawler]

It's a very user friendly detector with some good depth to it for sure OregonGregg. This one detector alone has put the fun back into metal detecting for me. And the price is right.

 

[Jerry-Wi]

I have both the 8.5X11 DD and the 9.5X12 concentric coils. They each have their own characteristics and I like them both so it is hard to pick a favorite.
They have different pinpointing characteristics but both are very accurate.
DD has better separation because of the sharper response but you need to slow down more than with the concentric coil. At least that is the way I use it.
The concentric coil may be a smidge deeper right at the center of the coil but not enough so that I would buy one just for getting more depth. This is largely offset by the DD being able to sense close to it's max depth from back to front where the concentric has a smaller cone right in the middle.

I tend to use the concentric when hunting large open areas and the DD for places with lots of trash.

Jerry