Transmitter cable for use in electromagnetic survey system, has set of current sources electrically coupled to antenna, where each of set of current sources are electrically coupled to two length cables

摘要

The cable has a set of current sources (32, 32`) electrically coupled to a dipole antenna (34). Each of the set of current sources is electrically coupled to two length cables (22, 26). A power isolation diode is provided between each of the set of current sources and the two length cables. The set of current sources are parallely electrically coupled. A common source of electrical power is provided to the set of current sources. Two of the set of current sources operate at different currents and frequencies.