Television Transmission Over Wire Lines

I F T H E development of television broadcasting follows in the footsteps of its predecessor in the sound broadcasting field, networks for interconnecting television stations will be very important. In fact m a n y students 1 of the problem believe t h a t such networks are a virtual necessity because of the expected high cost of programs. Considerable progress in the development of a wire line technique for this purpose has been made in connection with the Bell System's study of coaxial conductor systems for use in wide band telephony. D a t a previously published 2 · 3 - 4 have been supplemented recently by certain tests and experiments in the transmission of 441-line television images, the results of which are presented in this paper. This will cover the transmission characteristics of facilities both for intercity and local distribution, including the wire lines which were used during the television broadcast in New York of the proceedings of the Republican Convention in Philadelphia during the last week of June, 1940. This broadcast was undertaken jointly by the National Broadcasting Company and Bell System Companies as an experiment in the furtherance of the television art. A large p a r t of the experimental facilities used were manufactured by the Western Electric Company. LONG H A U L COAXIAL SYSTEMS