SOUTHWICK, MASS.—Hitachi Kokusai Electric Comark LLC has a long standing history in the broadcast TV market. Comark started more than 40 years ago manufacturing RF components for UHF transmitters and ...
During broadcast radio’s first decade, little thought was given to transmitter efficiency. Main concerns of the industry were availability of broadcast spectrum (sound familiar?); keeping transmitter ...
This FM transmitter circuit uses four radio frequency stages: a VHF oscillator built around transistor BF494 (T1), a preamplifier built around transistor BF200 (T2), a driver built around transistor ...
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