. BSTJ 1: 1. July 1922: Transmission Characteristics of the Submarine Cable. (Carson, John R.; Gilbert, ). thereexist k relations of the form (16) which the corresponding set ofconstants An, A-.,, . . Akl must satisfy. The remaining 2k inde-pendent constants can then be determined from a knowledge of theconditions at the terminals of the conductors. It is important to observe that the transmission characteristics ofa system of coaxial conductors are influenced to a great extent bythe manner of connecting the various members of the in the impedance of a complicated network
. BSTJ 1: 1. July 1922: Transmission Characteristics of the Submarine Cable. (Carson, John R.; Gilbert, ). thereexist k relations of the form (16) which the corresponding set ofconstants An, A-.,, . . Akl must satisfy. The remaining 2k inde-pendent constants can then be determined from a knowledge of theconditions at the terminals of the conductors. It is important to observe that the transmission characteristics ofa system of coaxial conductors are influenced to a great extent bythe manner of connecting the various members of the in the impedance of a complicated network such as asubmarine cable with several conducting sheaths in the return path,may often be traced to lack of proper connections between the sheaths,or to faulty joints. in The submarine cable armored with a continuous coaxial sheath,as shown in Fig. 2, is a particular case of the foregoing, and one whichpresents a clearer idea of the physical significance of the various stepsin the general theory. There are only two groups of conductors, the Copper Conductor - Insulator — Jute 1— Iron Armor Sea Water. Fig. 2 first consisting of the core conductor, and the second comprising theiron sheath and the sea water, the two groups being separated by theinsulating material and the layer of jute. Consequently, there isonly one mode of propagation, and the analysis is considerably sim-plified. The jute is assumed to contain sufficient sea water so that althoughit conducts practically no current axially, it maintains equality ofpotential between the outer surface of the gutta percha and the inner TRANSMISSION OVER SUBMARINE CABLES 97 surface of the iron sheath. Consequently equation (10) may bewritten |^ - E2 + E[ = - ixip® = - ipLnh, (18) where E\ and E2 are the values of electric field intensity at theouter surface of the core conductor and the inner surface of the iron,respectively, V is the potential difference between these two surfaces,and <£ is the magnetic flux threading unit
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectarmor, bookyear1922
