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Adjustable Gain question for you tech savvy folks

yowow#1

New member
As i understand it, a metal detector works off the same basic principle as say the old navy radars i used to operate, that it sends out a signal and the signal bounces off a metallic object and gives a return signal to be interpreted by your equipment. Pretty simple in theory i suppose...Now my question is this. The strength of the outgoing signal can be lowered or raised by your adjustable Gain " that is what a radar electronic tech" told me", and the incoming "returning' signal can be fined tuned with your sensitivity settings, if a metal detector does not have an adjustable Gain like the :whites: Whites V-series detectors, does that mean your outgoing signal strength is set internally and you have no control over the strength of your outgoing signal, and you can only fine tune the returning signal with your sensitivity settings? OR does the sensitivity settings work in conjunction with gain to strengthen or lessen your outgoing signal, if your detector has no adjustable Gain? Whew, i think i just confused myself. :detecting:
 
There are ground penetrating radar units but they are very expensive and the information is limited, our hobby metal detectors operates on a different technology.

The coil produces a magnetic field which induces an electrical charge, (eddie currents) in a metal object. That charge is measured in the return signal in phase shift and intensity and compared to known values and gives us an idea what the target might be. There is much more to it but this gives you an idea how a metal detector works.

The outgoing signal strength (coil voltage) can be changed on the V Series by turning on or off the Boost feature. (10 volts or 30 volts) The Gain on many detectors or what we call Sensitivity on the V series is the first amplification stage of the returned signal.
 
Thanks Larry, i was thinking they worked off the same principle, but i was really trying to compare apples and oranges. Thanks for the info.
 
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Thanks Elton for the info. very much appreciated. I guess i was thinking our hobby detectors worked like radar, but i reckon i was comparing apples to oranges:)
 
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