AUDIO FREQUENCY The Audio frequency follows the flow of impressed audio frequency current in a coated pipe and determines where it leaves. RADIO FREQUENCY Radio frequency locaters can be used in 3 different ways. The first is "inductively," placing on the ground directly over the buried conductor. The second to "energize" the conductor by direct connection via a cable. The third operation uses a transmitter and receiver together allowing the fastest method known for locating unknown buried metallic objects |