July 2017
Intermediate to advanced
1988 pages
112h 28m
English
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Chapter7.15
VHF (FM) Radio Transmitters
Overview
When Major Edwin H. Armstrong first patented frequency modulation (FM) in 1933 with the first experimental station, W2XMN going on air in 1937, there was significant resistance to the concept—the government resisted it, World War II delayed development and it was moved to a new band in 1945 (the current 88–108 MHz band used in North America and much of the world). Since then, however, there have been many developments, greatly improved efficiency of operation in tube amplifiers, development and improvement of solid state amplifiers and movement from signal generation using Voltage Controlled Oscillator circuitry, and discrete components to Direct to Channel signal generation ...
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