Posted by Steve Herschbach on 5/7/2008, 3:59 pm, in reply to "Re: 20 is just a batch"
24.237.104.38
Hi Eric,
Thanks for all you've done for us!!
That tone switch is a huge thing. I've been playing around with the Infinium and Minelab units coin detecting for several years and it has been glaringly obvious to me in such a scenario that 90% of the signals are high tones and are small iron and aluminum trash. Low tones are rare by comparison and include copper, silver, and clad coins. So having the ability to shut off the high tones vastly reduces the noise hammering the user.
There is a simpler thing here most people do not realize. The Minelab units and Infinium are dual tone. You get a hi-lo or a lo-hi on a target. Your units generate either a lo or a hi. That simple difference results in a 50% noise reduction in a target rich location. With an Infinium or Minelab if you want to go after a low tone target this is what you here.
hi-lo, hi-lo, hi-lo, hi-lo, hi-lo, hi-lo, hi-lo, hi-lo, hi-lo, hi-lo, hi-lo, hi-lo, lo-hi, hi-lo, hi-lo, hi-lo.
You have to train your ear to try and pick out when you get a lo-hi in the middle of tones of hi-lo signals.
Without the tone suppression your unit is still way better:
hi, hi, hi, hi, hi, hi, hi, hi, hi, hi, hi, hi, hi. hi, hi, hi, lo, hi, hi, hi, hi.
Now throw in the tone supression and cut out the high tones:
lo
The difference is stunning in practice. Of course some low tones are junk but the ratio is very acceptable in most but not all locations.
The biggest technical question I have is whether a second ground balance control can be added. One for setting the actual ground balance, and one for rejecting a chosen iron target.
Steve Herschbach
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