Television digest with electronics reports (Jan-Dec 1952)

Record Details:

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Maximum and minimum values of ERP are specified by the FCC for the various TV channels and are based on frequency and population. ‘‘Antenna gain” is derived from antenna arrays designed to concentrate radiation toward the earth at a low angle. Gain is calculated with reference to a single element antenna. Additional elements stacked vertically and properly excited will give the effect at the horizon of an increase in transmitter power. Gain per element in the array is usually near unity. Antenna gains of from 3 to 30 times can be obtained, depending on the channel frequency. In some instances directional patterns may be desirable, and directional radiation can be obtained from the “Super Gain” and “Super Turnstile” types of radiators. “Beam Tilting” is possible, and in some instances, may be desirable since it provides tilting of the beam vertically and makes possible concentration of the signal in certain areas within the coverage radius. Transmission line loss represents a loss in power and is minimized by keeping line runs as short as possible and by use of low-loss types of line. Wave guides may be used at the Ultra High Frequencies to reduce transmission losses. There are cases requiring special antenna design and installations. These may occur for the following reasons: FIG. 6. TRANSMITTER ON A NEARBY TALL BUILDING CD STUDIO BUILDING NEARBY TALL BUILDING 77 7777777 mmlm m m m mm m r COAXIAL CABLE OR EQUALIZED LINE 1. Special gain requirements not met by standard antenna. 2. Directional pattern requirements. 3. Installation of multiple TV antenna on one tower. (Common antenna sites.) The Engineering Consultant will assist in determining antenna specifications best suited for coverage of the market area. Coverage The family of coverage curves for various channel classifications included as Figs. 10 and 11 will give some idea of coverage to be expected. Fig. 10 shows effects on coverage radius in miles with a fixed an FIG. 8. IN LOCATING STUDIO, AVOID SOURCES OF INTERFERENCE \A» 1 1 1 1 1 1 1 1 / , : 4