Tuned resonant circuits, also called tank circuits or LC circuits, are used in the radio front end to seiect from the myriad of stations available at the antenna. The tuned resonant circiiii is made up of two principal components: inductors and capacitors, also known in old radio books as condensers. This section examines inductors and capacitors separately, and then iti combination, to determine how they function to tune a radio's RF, intermediate-frequency (IF), and local oscillator (LO) circuits. First, a brief digression is needed lo discuss vectors because ihev are used in describing the beliavior of these components and circuits.
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