Falsing when bumping coil on rocks with GPX5000

[meMiner]

Anybody else have this problem? When going "low and slow" with the GPX5000, it sounds off with a big "wango" when the coil hits an upturned rock. I tried securing the coil wire to the rod better but this did not seem to help much. Any other advise or just live with it?

 

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[CoinandRelicMan]

Got another coil to try and see if same symptoms occur? Also did the machine always do that way ?

 

[Jim in Idaho]

My GMT does the same thing...always has. I think it is a characteristic of the more sensitive detectors. Any distortion of the coil causes the detector to sound a target.
Jim

 

[bfloyd4445]

I think what you are hearing is the slight change in shape of the coil as it hits the rock creates an inductive spike which the machine then sees as a signal and screams out. And you are right this effect would be most pronounced in the most sensitive detectors.
So, what do you want, a little irritating noise or less gold?

 

[Jim in Idaho]

In my case, I just put up with it....wouldn't trade that GMT sensitivity for anything. As an aside...I noticed that my TDI S/L doesn't do it. But, it's not as sensitive as the GMT.
Jim

 

[bfloyd4445]

In my case, I just put up with it....wouldn't trade that GMT sensitivity for anything. As an aside...I noticed that my TDI S/L doesn't do it. But, it's not as sensitive as the GMT.
Jim

The more sensitivity the better to a point at which the noise interferes with hearing targets. Its easy to make a machime with lots of power, sensitivity, but not easy to make one that eliminates most of the trash without comprimising sensitivity and power. Your TDI S/L may in fact be as or more powerful than the GMT and with better discrtimination. The only way to tell for sure is a shootout between the two machines.