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Originally Posted by Esteban
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Nice link, Esteban! It looks like the IR in this detector is used to relay the signal data to the headphones for the purpose of eliminating the cable, which can be a significant source of noise in a sensitive detector. But it is also intended to move the display close to the search coil to make it easier to pinpoint the target, since you won't need to look away from the coil to see the meter.
What is strange about this detector is it describes locating metal objects by transmitting a VHF FM signal several hundred feet under the ground to locate metal obects. And it has the antenna construction details shown in the patent pictures. There you go Clondike Clad. You now know the target = metal objects, the transmission distance = several hundred feet under the ground or less, the coil details are shown, the frequency is specified, --- all you gotta do is put it together and build a circuit to make it work.
Hmmm... This was patented in 1997. I wonder why we haven't seen any of these detectors in the field?
Best wishes,
J_P