Manual Ground Balance???????

[tabdog]

I just got my first MD with manual ground balancing this month. Five months ago I didn't even know what manual ground balancing was. I have learned that it has some benefits that I can take advantage of.

I've been practicing and wasn't sure if I had it down just right or not.

Mirf gave me this Link and it has made me feel better about how I am doing with my progress.

In case you missed it, here it is.

http://tesoro.com/Multimedia-Center.html

I also have a Euro Sabre and I learned something about it I didn't know.

Best Wishes,

 

[colt]

tabdog, after a little practice, you will be able to ground galance with out evan thinking about it. I take a nickle with me every where I go, at every site I throw the nickle on the ground and after I ground balance, I do a little testing to see if I need to balance smooth, meaning no difference in threshold as I raise and lower the coil, or if I need to set my detector a little positive, meaning an increase in threshold hum as the coil is lowered to the ground. Just remember, with manual ground balance, you are in control. HH..Tom

 

[tabdog]

Thanks Tom,

That's informative. I know there is more to the feature, MGBing, than was demonstrated on that video. I have discovered interesting aspects of the feature they didn't even discuss on the video. It adds more flexibility to the MD.

I have a question. When you perform your test with the nickle, how do you determine where to set the GB?

Or may be the question should be. How do you perform the nickle on the ground test to determine whether to set the GB smooth or a little positive?

Or may be my question actually is. Why would someone want to set the GB a little positive as opposed to smooth?

I didn't know how ask that in one question. Probably because of being a little dumb about it

Thanks for sharing,

 

[colt]

tabdog, first I will find a spot where there is no targets and ground balance my detector with no change in the threshold hum as I raise and lower the coil, then I will lay the nickle on top of the ground and run my coil over it and see what kind of response I get. Next I will adjust the ground balance to where the threshold hum will have a slight increase as the coil is lowered to the ground, then run the coil over the nickle and see if there is any difference in depth and response. Sometimes you will be surprised in depth, just be adjusting the ground balance, most of the time it's just a matter of a slight turn of the ground balance knob, since you are already balanced.

A real good test to see the difference in the changes in ground balance is to ground balance your detector with no change in threshold as you raise and lower the coil to the ground, then lay a nickel on top of the ground. Run the coil over the nickle, adjust the ground balance 1/4 of a turn clockwise and run the coil over the nickle, keep truning the ground balance knob 1/4 of a turn each time and check the response on the nickle. As you keep turning 1/4 increments, you will get to the point where your detector will become so unstable it will not pick up the nickle.

 

[tabdog]

Thanks again Tom,

That helps. I'll have time to check this stuff out probably after Christmas.

Mary Christmas,

 

[tab-nabit]

They say to think of it this way - when you lower the coil to the ground, you want no change in the threshold. If the sound increases as the coil approaches the ground, then turn it down - counter-clock-wise, - think of the knob as a volume control - turn it up to increase and turn it down to decrease. Turn it up for more and turn it down for less - as the coil approaches the ground.
Myself, I usually like to have a very slight positive ground balance - slight increase in threshold as I lower the coil. This way it allows a slight change to be noticed - an increase, or a pull towards a null region, a decrease. I kind of got used to it this way since I used to detect with gold machines, and that's how we set them. I wanted to know if the threshold was pulled slightly to the positive or null region. If I didn't have the slight positive setting, then a bit of a pull towards the null region may not be noticeable. Having a slight positive ground balance was to make sure that it wasn't in the negative (null) region, which if a deep target caused a slight increase, that increase might have not crossed into the positive region to where the operator might not hear the increase.
On a scale: negative - 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 + positive
With the "0" being just silent and "1" to the positive side (right of 0)
If the machine was on the negative 1 (left of 0), and a deep gold nugget caused a slight increase, to bring it up one notch to the 0, then no increase in audio means zip/nada to the ear. So setting it just slightly positive (a 1 to the right of 0) was to discern that it wasn't to the negative slightly.
Keep in mind that this how we ran higher frequency gold machines for a slight and nice soft increase hoping for the deep gold nuggets others have worked over and missed, aw grrrr - this is almost making me want to get a couple gold machines and go at it again

 

[tabdog]

lol..........Thanks for sharing. That's very informative. It's also something I can take into the field and apply.

Isn't it a little cold for prospecting? That frozen gold may stick to your toung. Then what would you do?

Mary Christmas,

 

[Monte]

[quote tab-nabit]Myself, I usually like to have a very slight positive ground balance - slight increase in threshold as I lower the coil. This way it allows a slight change to be noticed - an increase, or a pull towards a null region, a decrease. I kind of got used to it this way since I used to detect with gold machines, and that's how we set them. Keep in mind that this how we ran higher frequency gold machines for a slight and nice soft increase hoping for the deep gold nuggets others have worked over and missed,[/quote][size=medium]While I generally like to maintain a slightly positive GB in the All Metal mode, and it is important to nugget hunting or going after any target in the conventional All Metal mode, it might have a different affect on Discriminate mode operation. It does depend upon the make and model, but in some "bad ground" encounters I have favored a somewhat negative GB in the All Metal mode to get better performance out of the Disc. mode. I am referring to times when I have used the original Lobo, a Pantera, and a Bandido.


These models have the Disc. mode GB reference tied in with the manual adjustment for All Metal and due to an off-set in their design, a slightly positive GB was way positive for the Disc. mode. I am referring to bad ground, and also when in search of target, high-conductive coins, such as silver halves and silver dollars.

Monte[/size]

 

[tabdog]

n/t