Abstract
Radio-frequency equipment is used for a vast range of purposes, including heat treating special steels, medical diathermy treatment for cancer, heat sealing plastic bags, and experiments in atomic physics. Nevertheless, as the name implies, the original use was in connection with the transmission of information by radio waves. The earliest form of this is wireless telegraphy (WT) using Morse code. This is followed by wireless telephony and, much later, broadcasting—radio and television. It is only a brief word, though, as this is a chapter particularly about analog electronic circuitry, not a general light-current electrical engineering. The output tuned circuit selects the desired harmonic. In principle, the bias and drive level can be adjusted to optimize the proportion of the desired harmonic in the collector current; however, whilst this is worth doing in a one-off circuit, it is difficult to achieve in production.
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