FM TUNERS
FM tuners operate in the very high-frequency regions and consequently have operating requirements different from those of a.m. tuners. The r.f. circuits and components must be of optimum design to provide sufficient sensitivity to pick-up f.m. stations under all conditions, and the audio aspects all circuitry must be of sufficient quality of design and construction to receive and pass audio frequencies from 15 to 20 kHz as may be broadcast by f.m. stations.
High fidelity AM reception is usually limited by the presence of high-level man-made noise and atomospheric disturbances which AM receivers cannot reject without loss of fidelity. Also, because of the propagation characteristics of frequencies used for standard a.m. broadcasting, ...
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