Posted by Reg on 5/10/2008, 8:58 am, in reply to "Re: The problem with iron"
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Hi Steve,
I have given a more thorough idea of the GB setting and what actually happens in my answer to Rick, but I will try to further explain it here.
As for your question about the tone break idea, in the most general terms, the answer is yes. As I adjust the GB, the tone may change on a particular object if the conductivity is very close to the ground at the present GB setting. This is similar to what happens when the tone break adjustment on a VLF is adjusted. At the right point, an object may generate a high tone, but with a slight adjustment may generate a low or lower tone on a VLF.
On a PI, the same thing holds true. At that right setting, an object may generate a high tone, but with a slight adjustment of the GB setting, that same object may now cause a low tone. Adjust the GB far enough, and a greater number of objects will change tones.
Keep in mind that on the GS 5, this tone break things creates a high tone or a low tone only. On some other PI's, one will generally hear the object create a dual tone signal that first goes low but end up high or starts out high then end up low. This is generally referred to as a woo/wee signal or a wee/woo signal. This is what a Minelab or the Garrett Infinium does.
On the GS 5, there is no dual tone wee/woo or woo/wee. Instead, you have a single tone wee or a woo type signal, meaning you have a high (wee) or a low tone (woo) but not both. This is why the single tone feature works so well.
Now, since I have not tried the new Whites PI, I can't say just what happens, but if they have not changed the unique design of the GS 5 on how the tones are generated, then the Whites should react the same. I won't know until I try it. I am hoping they have not changed this part of the circuitry.
This single tone feature probably doesn't make much sense right now, especially if you have not heard a ML or an Infinium audio target signal and compared it to a GS 5 signal.
On some VLF's you have an adjustment of the autotune speed of the all metal signal. On the Whites, this is the SAT speed control. If you have that adjustment and listen carefully, you will hear the audio rise in signal and then go quiet on a typical target.
If you take a hotrock or a ceramic magnet and pass it past the coil when at normal ground balance and you will now hear the audio go quiet first then get louder once the magnet has passed. This is basically the wee/woo or woo/wee type signal I was referring to.
On the GS 5, the "woo" half of that signal is eliminated. This is what makes the single tone feature work so well on the GS 5.
Reg
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