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Locking in at 50

dirtdigginlady

New member
My ground is pretty good so I have gotten in a habit of "always" (in my area) locking my machine in at 50 before I even start to hunt. I hardly ever even take a ground reading anymore. It just seems to work best for me doing it that way. Is there anything I am going to lose from doing this? I want to get the most out of the MXT.
 
You don't need to take a reading, I almost never do. But why would you not let the machine G/B correctly before you lock it. Yes you are losing something unless the ground is exactly 50. How much will you lose, well how far are you from 50? Will it work your way, yes. The best, no. Rob
 
The GND readings provided in "Prospecting" mode relate to the VDI number to which the ground-balance is set. When the ground-balance is locked to a value that doesn't match the ground's VDI number (as would possibly be the case if one were to lock a GND of 50 instead of pumping the coil with "Trac" in the "Ground" or "Salt" position) there may be problems if the strength of the mineralization is strong.

If the mineralization is sufficiently strong <em>and</em> the ground-balance doesn't match the ground's VDI number, the MXT will respond to the ground and many false signals will be heard. However, if the ground's mineralization is too weak to cause false signals it can be beneficial to lock the ground-balance "out of the way."

To see if the mineralization is strong, with a GND of 50 "locked", switch to either C&J or Relic mode. Next, hold the coil up, about waist-high off the ground. Now, with the coil held up, squeeze and hold the trigger. With the trigger held, lower the search coil to the ground (that if free of metal targets) and listen to the threshold. If the threshold goes silent or increases significantly, this is an indication the GND 50 is not appropriate. However, if there is not a significant change to the threshold when performing this test, next repeat the test with GND locked at 83. If the change to the audio threshold is similar for these two tests it means that there are low levels of mineralization. In this case, locking the GND at 50 will provide a slight increase (5%-10%) in high-VDI target (US silver dollar) sensitivity versus a GND value of 83.

The reason for this is the higher the GND number (the closer the ground-balance is set to a VDI number of -95) the more some of the sensitivity reducing effects of the ground-balance bleeds around to the high VDI numbers.

If you do find that the "GND 50/GND 83" test provides noticeably different results (most likely the GND 50 will provide a stronger ground response while performing the tests) be aware that any extra high-VDI target sensitivity benefit of locking a GND of 50 may be lost to false signals from ground noise that would otherwise not be heard if the GND value had tracked properly to the ground.

Enjoy.
 
This tip was originally posted by Monte ..... before he crossed to the dark side. :)

With the detector 'Off' and the coil away from the ground or any metal, toggle the GB switch into the 'Lock' setting. Then turn the detector on.

If you turn the MXT 'On' when in the Locked setting, it is at an established '83' and that should compensate for just about any nasty ground you're going to hunt over!
 
<b>"If you turn the MXT 'On' when in the Locked setting, it is at an established '83' and that should compensate for just about any nasty ground you're going to hunt over!"</b>

That is not really correct. See this post for more on why the GND (VDI) number doesn't necessarily indicate "nasty" ground: GND Info Post

Enjoy.
 
When <b>[TRAC]</b> is set to <b>GROUND</b> or <b>SALT</b> at power-up and the <b>[TRAC]</b> switch is immediately changed to <b>LOCK</B> thereafter, a ground-balance corresponding to a GND of 50 is locked.

Enjoy.
 
I don't disagree with you. As a matter of fact, I remember reading your insightful post on the subject.
I was just quoting from Monte's old post about the "factory presets" ground balance on the MXT.
 
Ok yesterday where I was hunting the ground read a 38. So at those readings am I loosing anything by locking in at 50??? I would think not but I'll let the experts tell me.
 
Basically if you are locked at 50 and the ground is not at a constant 50. Yes, you are loosing. If you have a machine that has the ability to auto GB or can manually be ground balanced. It should always be set for the ground conditions you are hunting in, at that time. Whether or not ground cancellation is set to high or to low. That is irrelevant. If it is not properly set every time. You are loosing by either cancelling out items that should not be cancelled in your ground conditions or by loosing depth. Either way, the key word here is LOOSING.
 
Howdy! I still read things here a lot but don't post as often as I used to.

First, to Rudy: I haven't really crossed over to the dark side, I have enjoyed using a few newer models, and have found one that really does work rather well. No, not perfect, but well. I also enjoy using my Shadow X5 on occasion, and modified IDX Pro a good deal in ghost town type scenarios.

I needed a faster-sweep 'cruising unit' so I parted with the noisy MXT and went back to using an XLT or XL Pro for a while. I still like them both, and like the MXT, too, except for the noise.

I wonder what White's is bringing out next, however, as the XLT was released 12 years ago this spring, and the DFX doesn't seem to really be getting the sales that most of my dealer friends thought (hoped) it would. Still, even after owning seventeen XLT,s, I just might order one final unit and hang onto it as a 'cruiser' detector.

Also, thank you for acknowledging that I was the first to mention the ability to 'lock' the '50' and '83' on the MXT. You would have thought that it would have been promoted in the manual and such, but I found that many there as well as dealers didn't know about it.
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For Mikel and others: The MXT is a very good detector. Matter of fact, there are a LOT of very good detectors out there, but sadly most users never take the time to learn them. Glad to see this forum and a few others active with questions and answers as that's what helps us all become knowledgeable and better at detecting.
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To Jeff: Like everyone else should, I appreciate your input on this and other forums. Naturally, you are correct in your statements. I am the first to make note that I am not a book-taught, educated electronic engineer. But I have more field time in a wide range of detecting scenarios than most design engineers will ever have and I a pretty fair understanding of the basics of what makes these things work.

Through the years I have spent time with several design engineers in discussions during some product development and one thing that I do know and that is most folks just do not understand "technical talk." Heck, look at all the factory preset GB models available.

We both know it isn't difficult to GB a detector in most environments, but we also know that there are many people who just don't comprehend "positive" and "negative" reactions when lowering a coil, or how to 'increase' or 'decrease' a control and set a functional GB. So, I have always tried to explain things as best I can and put in "common speak" so most might understand it.

I have always been one to enjoy analogies, and your post below about muddy water and seeing/not seeing the bottom as it relates to perceived depth is choice! I think that should help some understand what you were trying to say.

As for the cut and paste Rudy used:

"If you turn the MXT 'On' when in the Locked setting, it is at an established '83' and that should compensate for just about any nasty ground you're going to hunt over!"

Let me just point out that is said "... SHOULD..." compensate for most nasty ground, not that it always will. Due to the type of rapid tracking circuitry White's is using, ans since they didn't add an ability to manually tweak the MXT's GB, there are going to be times when a MXT user is going to try hunting a site and become very frustrated due to the site challenges and inability to get a tracked GB. So, if the conditions are really bad, then until they master their MXT, this quick set-up does come in handy.

It's just another tool, in the way of set-up technique, to attempt to get some operational performance when faced with a set of challenges. We all know there is no absolute and that 'theory' in design doesn't always hold true in the field.

Again, I enjoy your posts and love the analogies. :)

Monte
 
Monte, thought you might ought to know I pulled a nickle around 9" the other day with the MXT and 8" Excelerator. TDI wavered some what but I just had to see what was down there in the 91 sand. That 14" DD lets me cruse pretty good if your letiner slide on the the ground.
 
Monte- Glad to hear you haven't "crossed over" to anywhere yet. Looking forward to your justifiably fewer posts.

Good huntin
 
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