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Offline tabdog
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« Reply #10 on: August 01, 2009, 05:12:58 pm »
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No offence intended here.

But a manual ground balance is very much like a discriminator.
Some of the older ten turn machines could even discriminate out
iron.

I am going to describe the process of manual ground balancing.

When using a three and one half turn manual ground balance,
turn the knob counter clock(-) wise four complete revolutions. This
will be all the way negative. Then turn it two complete revolutions
to the right(+). That will set it a little positive.... This will be close for
most soils.

When adjusting the GB over metal-free ground, you can get four
different reactions as the search coil is lowered toward the ground.

I will discuss three for now.

This ground balance process requires that the search coil be held about 8" above the ground. Use a slight audio hum, or more if
needed.

Then, as the search coil is lowered toward the ground, to within one
half to one inch to the grounds surface, you listen for any change in the threshold audio and use that information to make any necessary
ground balance adjustments. The threshold audio might decrease as
the coil approaches the ground, suggesting that the GB setting is too
negative.  Naturally, the hint here is to increase the GB setting.(+)

Or, as the coil approaches the ground, the audio threshold might
increase, this suggesting that the GB setting is too positive. Naturally,
this gives you the clue that you need to reduce the GB setting(-).

A third response is, well, no real response at all as the coil is lowered
toward the ground. In essence, a "perfect" GB whereby there is no
increase or decrease as the coil is lowered toward the ground from about a 8" height. The threshold audio remains the same as the coil
is lowered to about ?"-1" from the surface. This would be the ideal
GB adjustment to achieve because you can easily hear any slight
change in the threshold during the search.

Happy Huntin,

Tabdog




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Offline Rebel73153Topic starter
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« Reply #11 on: August 01, 2009, 05:14:25 pm »
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very interesting. I will have to try to remember that. Take care.

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Offline tabdog
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« Reply #12 on: August 01, 2009, 05:17:19 pm »
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Quote:Posted by Rebel73153
thanks but i am still not understanding how the Cibola can use the threshold adjustment when it doesn't have an actual all metal mode?


Both the Cibola and the Vaquero have a threshold based all metal mode.

That is a true all metal mode.

The Cibola does not have manual ground balance, but the Vaquero does.

Confusing is it not?

HH,

Tabdog

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Offline tabdog
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« Reply #13 on: August 01, 2009, 05:30:17 pm »
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Quote:Posted by GoldDigger1950
The all metal mode is only for clearing the area of targets. If you tune your ground balance over a target by accident the ground balance will be way off where it should be. You have to be sure the area is target free. Thus, I suggested hunting in the all metal mode but you can accomplish the same thing by turning your discrimination down all the way. That is essentially the same as the all metal mode.


The all metal mode can be used for many things besides clearing an area of targets.
It is great for sizing, depth reading and ID ing in general.

The all metal mode and the discriminate modes are very much different, and they
are both useful tools that can be used in tandom to get more info if needed.

That is why they are both there. Tesoro does not add much in tghe way of bells
and whistles. What is there is useful.

HH,

Tabdog
Posted on: August 01, 2009, 06:24:49 PM
Quote:Posted by Rebel73153
Ok again thank you. But the Cibola doesn't have a manual ground balance, just the threshold adjustment. And since it also doen't have a true all metal mode i don't see what good the threshold adjustment is. Maybe i'm just dense, but if there is no all metal mode how can you use the threshold noise?

Ok i just re-read your last post and think maybe i kinda understand. Turning the disc all the way down allows you to use the threshold even thought it is not a True All metal?


The Cibola and Vaquero do have a true threshold based all metal mode.

Turning the discrimination up or down does not effect the threshold at all.

Sorry you are getting confusing info,

Tabdog

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« Last Edit: August 01, 2009, 05:32:21 pm by tabdog »
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« Reply #14 on: August 01, 2009, 07:11:18 pm »
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Rebel173153;

Hi, I am interested in what kinds of answers you get.... however, I will give mine:

threshold: that is like a barrier to false indications or noise; Violent Fight

sensitivity: as it says more sensitivity may need more threshold; Kiss

ground balance: is supposed to balance out spurious (good word) effects that might be produced by the mineral content of the ground (like magnetite) Detecting

Did I get it right? Wise

goldigger (Brian)

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Offline Rebel73153Topic starter
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« Reply #15 on: August 01, 2009, 07:15:51 pm »
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Everybodys opinion is welcome. As far as did you get it right, heck i don't know, i asked the question.  Grin

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« Reply #16 on: August 02, 2009, 11:31:30 pm »
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Rebel173153;

Everybody has their own interpretation, according to what ever technical or non-technical background they may have. Crazy

Best thing is experiment, play with the controls and see what they can do for you. Even try-before-u-by, if you can.

No 2 people use a given machine the same way.

I am still looking to see if anyone has a PRIZM

goldigger

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