My friend uses an old TR discriminator and something he calls “reverse discrimination,” and he usually finds more targets than I do. What is he doing?
While it may be very difficult to find a target using an older TR discriminator in the Discriminate mode, it is very easy to find any target while using the All Metal mode. Reverse discrimination means that you search in All Metal mode until you find a target. Then, since you know where the target is, you place the searchcoil directly over it and switch the detector to the Discriminate mode. Then moving the coil off of the target by sliding it about one or two inches in any direction and listening for the sound change will tell you the type of target—good or bad. The word reverse is used because if the target is good, the detector will go silent or “null” as it is moved away from the target. If the target is a bad one, the detector will beep as the coil is moved away from the target. This technique can work very effectively for someone who is very patient, but with the technology we have today, it seems to me to be a waste of time.
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