Technical characteristics of FTL type no. 20-B UHF television transmitter

The technical objectives of the design of a 1-kw ultrahigh-frequency television transmitter and the methods employed for achieving the desired results are outlined. The aural transmitter is described and details are given for the design of the frequency-lock system, which insures frequency stability of the aural relative to the visual transmitter. A single crystal-controlled oscillator is used to reference the frequency-modulation aural oscillator, and to provide the necessary frequency offset between aural and visual carrier frequencies. The frequency-multiplier and power-amplifier chain in the aural is described, with particular emphasis on the reasons for the engineering choices made. Power amplification and frequency multiplication are performed simultaneously in order that the most economical and reliable design can be obtained.