Accomplished by interpreting the centers of audio response width in perpendicular directions or scans. See also Detuning. Soil which contains conductive minerals or moist salts which have a positive or upward effect on an air-tuned threshold. A mode of operation where the transmitter circuit pulses an electrical current into the ground be fore it quickly shuts down. The eddy cur rents dissipate immediately from poor conductors such as wet salt sand and ground minerals.
Metals hold eddy cur rents because they are better conductors.
An indication of target nonacceptance by a null in threshold or broken sound while operating in a discriminate mode. A radio frequency detector having its own transmit and receive windings separate and in an orthogonal con- figuration. This detector is capable of deep large object detection while naturally ignoring small targets such as nails and individual coins. With newer detectors, this technique is used to gain depth. A search- coil emits and receives signals from the ground and metal targets.