Carrier Systems on Long Distance Telephone Lines

Systems for Wide-Band Transmission Over Coaxial Lines

“…T appears from recent development work that under some conditions it will be economically advantageous to make use of considerably wider frequency ranges for telephone and telegraph transmission than are now in use 1,2 or than are covered in the recent paper on carrier in cable, 8 Furthermore, the possibilities of television have come into active consideration and it is realized that a band of the order of one million cycles or more in width would be essential for television of reasonably high definition if that art were to come into practical use. 4,6 This paper describes certain apparatus and structures which have been developed to employ such wide frequency ranges.…”