Questions on Depth

[skateteacher]

IN addition to my 6x10 I just purchased a used 950 coil for my MXT. Put it on my MD and went outside to my little test garden and dang it if I didn't get any better results than when I used my 6x10. So here's my questions.

1. How do you marry a coil to a detector so that you can achieve the greatest amount of depth?
2. Do you increase or decrease the gain to get better depth?
3. In clay type soil what types of depth reading should you be getting with a 950 coil on the MXT?
4. In an air test, what should be acceptable in terms of depth on a penny, nickel, dime and quarter?
5. Could there be something wrong with my detector?

Thanks- I'm a new detector in terms of months but since the new year I've put about 75 hours in of detecting time(love it!) but I know I'm still new enough to not know what I am doing.

Dave

 

[Larry (IL)]

Under certain conditions a DD coil will get the same or better depth than a concentric coil.


1. It is not needed

2. Increase gain and/or lower the discrimination.

3. It varies greatly with the mineralization.

4. I don't know, I don't hunt coins in the air. Air tests has nothing to do with how deep it goes in the ground.

5. Probably not.

 

[BarberBill]

I agree with Larry. The only thing I would add is I feel air tests on coins are useful in the sense that if the performance of a machine/coil combination seems to deteriorate in the field, you have a previously determined level to compare back to. If you were detecting a quarter at 9" and suddenly the best you can do is 5", it's time to look for the reason the performance has changed. JMHO
BB

 

[Aarong81]

But if someone is concerned about there detector like skateteacher, they might want to ask if someone with the same setup could provide their results of an airtest to compare with. Everyone should have the same amount of minerals in their air so the tests should be very close. I don't have a 6x10 coil so I can't do it but hopefully someone will be able to help. If someone is able to, be sure to state the axact positions of each control so both tests will be as similar as possible. I have never figured out how to GB when doing air tests, BUT the MXT is suppose to start with an exact GB setting when first turning the machine on. So by leaving it locked and not adjusting the GB both machines should be GB'ed the same. Whether the GB is where it should be or not, at least both will be the same.

 

[GpSnoopy]

If you wish to Air Test, you MUST have the Ground Balance Switch in the LOCK postion.

As per the manual.....

If you attempt to demonstrate or test the
MXT by waving targets in the air in front
of the search coil, it is ESSENTIAL to
have the GROUND BALANCE toggle in
the Lock position, NOT Ground or Salt.

This is necessary, for when the MXT is in
the Ground or Salt positions, the search
coil must SEE ground while it is passing
over the target or it will think that the
target IS ground and will attempt to track
it out. This is the case in all MODEs.