Posted by Jbird on 12/26/2007, 8:24 pm, in reply to "Thanks Kevin"
12.145.14.34
Hey Tom.....Consider the "audio" or what you are calling the power knob as a sensitivity type control for the discrimination mode. It is seperate from the adjustmnents you make for sensitivity in the all metal mode.
In Disc mode, what we think of as sensitivity is preset and the "audio" knob allows a threshold type adjustment to select audio from targets depending on the strength of the target signal. With the knob over toward the counterclockwise position, only stronger signals can pass the threshold adjustment to give an audio signal. As you turn the knob clockwise, you lower the threshold setting so that weaker reading targets are allowed to pass and give an audio signal. With the knob fully clockwise, you are hearing audio from all the weaker as well as stronger targets that the detector is capable of sensing.
The all metal sensitivity adjustments effect only the all metal mode and this is not a threshold type of sensitivity adjustment but is a "gain" type adjustment and target sounds are much more modulated and can tell you a lot about a targets conductance, size, shape, and depth.
If you have never hunted much in all metal mode, you need to practice listening to target sounds with the goldtrax alll metal mode and that 6X9 2D coil. It is one heck of a detecting tool once you get familiar with it. The sounds of the all metal mode can be effected by the autospeed setting too so adjust that to a tuning speed thats comfortable and effective for you and listen to all kinds of sounds from both good and trash targets untill you can recognize the differences. You can quickly tell the targets size and shape and some depth indication. This sounds crazy and bassackwards but ALL detectors with a ground balanced all metal mode looses some sensitivity to the more conductive targets. A dime for instance will give a soft, tight signal while a quarter will be soft but a little wider sounding. Small compact silver jewelry items can sound a lot like a dime while a larger silver item like a braclet may sound kind of soft but wider. If you raise your coil about 3 to 4 inches and pass back over these higher conductive targets, their audio strength fades fast.
Mid conductance targets like pennies, larger square tabs, pull tabs, etc hit a little stronger than the higher conductive stuff and dont fade as fast with a raised coil test.
Lower conductance targets like lead, bronze, iron, nickels, etc will hit harder and wider than the higher conductance items and dont tend to fade as much with a raised coil test.
To me, pull tabs with beaver tail attached give a sort of scattered sound.
Well, Im getting kind of carried away again tring to put sounds into words.
Its kind of hard to do because the two of us, listening to the same sound, might describe it differently. But anyway, to sum this up.....A discrimination mode is pretty much just a go-no go, beep-no beep, but a nice smooth all metal mode has some audio sounds that really help identify targets.
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