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GMT vs MXT Pro Propecting Discrimination - Iron, Hot Rocks, and other Junk

L

LookandSee

New member
Hi Folks !

I had a question regarding discrimination iron, hot rocks, and other junk while nugget shooting.

Which detector (GMT or MXT) has a more accurate Iron/Hot Rock/Junk discrimination ability.

I know that the GMT has the (trigger squeezed) analyze function. Does the MXT have a similiar ability and same accuracy ?

I guess what I am wondering is while nugget detecting which detector will have me digging less junk while not missing nuggets at the same time?

Also, will the MXT disregard hot rocks as easily and the GMT ?

Thanks !
 
First off, you have to understand that the GMT and MXT are basically the same detector - http://whiteselectronics.com/info/field-reports/73.html

The GMT came first and has a basic ferrous identification system. Most of the extra work that went into the MXT was on refining the discrimination system. It offers not only the same system the GMT offers but several others. Simply based on discrimination capability the MXT is the winner.

For instance the best you can do on hot rocks with the GMT is get iron based hot rocks and ferrous targets to identify as ferrous on the meter, and if strong enough, to trigger the "grunt" audio response. This can get pretty noisy in a hot rock infested area. The MXT allows you to crank in just enough audio discrimination to eliminate iron hot rock responses. A real boon is really trashy locations. i like relic mode with the control set about 2 with key switch forward to suppress ferrous responses. Runs pretty quiet with a high pitch chirp on non-ferrous targets. A non-ferrous hot rock will read good on a GMT but on an MXT can often be narrowed down to a certain VDI response and ignored. In a similar fashion if you got into a location with a bunch of a particular shell casing you could ignore that VDI with the MXT, the GMT they will all be a "gold" response. So that gives you an idea of the discrimination tricks one can play with an MXT that are impossible on a GMT.

Having said all that I have to throw in my normal disclaimer pointing out that aggressive discrimination will almost always result in missed gold nuggets.

Steve Herschbach
 
I have to agree with Steve, using both the MXT and the GMT for prospecting .....I sold my GMT and now only use the MXT PRO with a 6X10 coil... the 12" coil is just to big for prospecting gold you miss to many small pickers with it. :shrug:
 
I think part of what Steve mentioned can be taken wrong, At least while I read it I was taking it wrong.
"In a similar fashion if you got into a location with a bunch of a particular shell casing you could ignore that VDI with the MXT"
It was not mis-spoken but I read into it wrong, myself. Yes, you can definitely recognize certain VDI's and personally ignore those targets but the MXT itself doesn't ignore specific VDI's without cranking up the Disc and ignoring all VDI's below that point. The ability to ignore, say, 20-24 VDI and still detect above AND below those VDI's is called notching and found in more expensive models(DFX).

I'm not saying it was said wrong but since I was confused for a moment I thought I would clarify incase anyone else misread it like I did. :)
 
Thanks for the the info Steve - I really appreciate it !

Thanks for the clarification Aarong81. I myself understood what Steve was saying but some other people might not have understood that.

So far great information ! I am very close now to finally making a purchase decision.
 
Yeah, do not crank that disc knob too high! 1.5 to 2.0 max, you need to test on a small rusty nail and go just high enough to get it to break up. Higher VDI targets like shell casings you just note the VDI number and mentally ignore it, but it is going to beep.

The MXT (not Pro) does have trigger forward pulltab notch in coin mode but few seem to use it. More a coin hunting function anyway.

Steve Herschbach
 
Thats a good thing to remember, Steve. I have the pro model and vaguely remember reading about the 'mxt' model having that notch feature. That could cause quite the confusion when someone finally realizes their detector is not making any sounds in the 18-22 VDI range! That would explain why they never dig nickels as well. lol
 
A few years ago I did some testing of the Coin and Jewelry Alternate, "Pull-tab Notch", on my standard MXT. The range that was notched out was from about +28 to +49. All of the nickels I tested rang out loud and clear.
 
Hunt4Fun said:
A few years ago I did some testing of the Coin and Jewelry Alternate, "Pull-tab Notch", on my standard MXT. The range that was notched out was from about +28 to +49. All of the nickels I tested rang out loud and clear.
Click to expand...

Wow, I would say so, too! Nickels will be around +18 to +22. I'm not sure why Whites would put a notch at that range except that no US coins fall in that range(I've dug IH cents that were in the +50's). Regardless, I don't ignore anything over +12 or so. I still miss small gold rings between +0 and +12 but digging tons of foil gets old fast.
 
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