Network Broadcasting

Network Broadcasting

Contents. How telephone transmission lines are used to convey network programs to radio stations located in various sections of the country. Opening scenes indicate the wide variety of modern uses of the radio. There follows a scene of an excited family listening to a radio program in 1922. On a map the principal broadcasting networks and lines of transmission are shown. The next sequence shows the need for special transmission lines to carry the wide frequency range of radio programs. An animated diagram indicates the frequency range of the human voice, the bass viol, bassoon, violin, and piccolo. A brief explanation is given of overtones. The commentator explains that ordinary communication lines are not adequate for transmitting over such a wide frequency range. An orchestra is shown playing Schubert's Unfinished Symphony. A diagram accompanied by sound indicates how the music would sound first without the high notes, then without the low notes, then with all notes being transmitted. On a map the number of stations carrying the Coolidge broadcast in 1923 is contrasted with the stations carrying a broadcast by President Roosevelt. In a supervisory office technical experts watch the circuits carrying a network broadcast. A map shows an alternate circuit that was selected when a storm made transmission over the usual route impossible. A technician plots the stations to be used in a broadcast and the stations are switched onto the wires. Closing views show broadcasts of various types, the transmission lines across the country, and men at work at the switchboards. Appraisal. Excellent for (1) giving impressions of the procedure of transmitting a network radio program, (2) demonstrating the frequency range required for adequate transmission, and (3) indicating some vocational opportunities in radio. Should be useful in developing an appreciation of timing and cooperation required in the transmission of a network program, and in furthering an understanding of the import

https://archive.org/details/0809_Network_Broadcasting_02_01_12_00 · Public domain (Internet Archive)