Synopsis: This paper deals with the transmission problems which were met and solved in connection with providing wire circuits from Washington to New York for the television demonstrations which took place on April 7, 1927, and following. For transmission of the television images a single transmission channel was set up combining the frequency ranges usually assigned to telegraph, telephone and certain carrier channels. The special line requirements were met so successfully that the television images transmitted from Washington were indistinguishable from those transmitted locally.
Synopsis.-Values of the prsmary transmission constants interest in telephone work, namely, the attenuation, the characteristic R, L, G, and C for open-wire telephone lines are presented, and impedance, the phase constant, and the velocity of propagation. the factors which affect these constants in practise are discussed. Data regarding these characteristics are given for the frequency Consideration is then given to the constants which are of principal range from 0 to 50,000 cycles.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.