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1949 THEATER TELEVISION 335
Intercity Radio -Relay Services — The second method available today for intercity relay of television programs is afforded by microwave radio relays. Radio relays constructed by A. T. and T. extend the coaxial-cable system from New York to Boston, from Toledo to Detroit, and from Chicago to Milwaukee. A. T. and T. has a radio relay under construction between New York and Chicago, and has applied for FCC consent to construct other radio relays between San Francisco and Los Angeles. In addition, Western Union has a radiorelay system available for use between New York and Philadelphia, and contemplates an extension of its system to the Midwest and South. These radio relays are operated on a " common-carrier" basis and are open to use by television broadcasters under tariff schedules filed with the FCC. The A. T. and T. rates are the same as those in effect for coaxial-cable intercity service. The Western Union rates are somewhat different. Other privately owned and operated radio relays are in operation in various localities.
The A. T. and T. intercity radio relays operate on the frequency band 3700 to 4200 megacycles, and the Western Union relays operate on 5925 to 6425 megacycles. Both these bands are allocated by the FCC to "Common-Carrier Fixed Circuits." The A. T. and T. relays can provide a bandwidth of 4 megacycles, while the Western Union New York to Philadelphia relay is equipped to provide a 5-megacycle bandwidth. Intercity television relays are based on line-of-sight transmissions from station to station, with intermediate stations separated by about 30 miles between cities. The problems involved in theater television use of intercity relays are substantially the same as the problems stated above as to use of the coaxial cable.
Bell System Telephone Wires — The third available system for transmission of television programs is the use of so-called "balanced" telephone wires. A network of such telephone wires extends under the streets of our cities, and across the continent operated by the Bell System telephone companies. Over moderate distances of from one to two miles, these telephone wires may be adapted to the purpose of television transmission. They thus are useful for intracity transmission, including remote pickup, STL, and possibly as the basis for a multiple-addressee system. The telephone wires may also prove to be the most economical method for distribution of theater television sound.