amcjavelin
Active member
hello there been a while since I've visited here and was wondering does anyone here no anyone that has added a G/B mod to there unit? or any other internal mods?
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amcjavelin said:hello there been a while since I've visited here and was wondering does anyone here no anyone that has added a G/B mod to there unit? or any other internal mods?
Dave J. said:The automatic tuning and automatic ground rejection are both accomplished with two stages of differentiation (not by adjusting phase, which is fixed).
In theory you could bring the internal ferrite phase tweak out and call it a "ground balance knob", but you'd likely be disappointed in the results. Adjust it just a little too far or use it in rocky ground and the machine's gonna become noisy as heck.
Dave J. said:We went to the single board to cut manufacturing cost; and at the same time there were several design improvements, stuff you probably wouldn't notice unless you were working on salt water beaches.
When you're operating in discrimination mode, depth is determined primarily by the discrimination channel and fiddling with the phase of the resistive (all metals) channel has almost no effect on depth. This is why most older metal detectors that had a ground balance knob, reverted to fixed phase operation when in discrimination mode. Most of our computerized metal detectors built on the T2 and later platforms that have manual and/or pushbutton ground balancing do use the ground balanced signal for control in addition to the fixed phase resistive signal: in some ground this provides a slight improvement. And, it's "just software", what could be lower cost than that? [AARGH! if you only knew how expensive software really is.....]
JJdigs said:Dave how did you find your path on the metal detector design world ? If you don't mind me asking.
Just regular Army medic. 2-year draftee.alex74 said:dave, you became a medic? what kind of?
regards, alex (a medic)