Radio receiver using frequency synthesizer

摘要

There is disclosed a signal-seeking, scanning superheterodyne radio receiver using frequency synthesizing apparatus to generate the required local oscillator signals and capable of receiving signals on all four bands comprising the public service radio frequencies. The frequency synthesizing apparatus includes circuitry for selectively altering the frequencies of the reference oscillator signal and the offset oscillator signal. Alteration of the reference oscillator signal frequency permits economical use of the same frequency synthesizing apparatus in different bands wherein the spacing between adjacent frequencies is different, whereas alteration of the offset oscillator signal frequency permits the generation of local oscillator signals which fall between multiples of the reference signal frequency.