Improvements in Piloting Cable Receiving Apparatus

A. Crossley
1922 Proceedings of the IRE  
Since the writing of a previous article on "Piloting Vessels by Electrically Energized Cables"' many improvements have been made in the receiving apparatus for the piloting cable system. These improvements have greatly increased the effective range of the receiving apparatus which in turn reduced the power input into the cable. The object of this paper is to describe the improvements made in the receiving apparatus and thereby add to the meager information now available on the subject of
more » ... e subject of piloting vessels by means of electrically energized cables. The following paragraphs describe the different stages of development of the apparatus and the general characteristics of the final model of piloting cablereceiving equipment, which is now being given service tests in the New York Harbor. NEW LONDON EXPERIMENTS During experiments conducted at the Submarine Base, New London, Connecticut, an attempt was made to tune the receiving apparatus to resonance by means of a 0.0025 microfarad variable condenser (air dielectric) inserted in series with the 240turn four foot (1.3 m.) square collector coil and the primary of the first audio frequency transformer of the SE-1600 two-stage audio frequency amplifier. A schematic diagram of this circuit is shown in Figure 1 . Due to the small value of capacity of the condenser only a slight increase was noted in the strength of the received signal from cable. Efforts were made to obtain condensers of larger capacity at the Submarine Base, but no condensers were obtainable that were of a capacity less than 1 microfarad. Further experiments *
doi:10.1109/jrproc.1922.219789 fatcat:m7swvbdokfbl7ij47mznkwj3ya