Frequency modulated transmitter applicable to mf broadcasting

H - Electricity – 04 – B

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325/58

H04B 1/04 (2006.01) H03C 3/09 (2006.01)

Patent

CA 1239667

ABSTRACT OF THE DISCLOSURE The invention concerns a frequency modulation broadcasting trans- mitter in which the output oscillator at the transmission frequency is modulated not directly by the audiofrequency signal but through the intermediary of a phase locking loop comprising a phase comparator supplied, on the one hand, by the output signal filtered from a picture or image frequency rejection mixer. This mixer receives, on the one hand, a modulated intermediary frequency signal from a modulator and, on the other hand, the output signal of the oscillator at the transmitting frequency Fs, the reference frequency Fo1 being determined as a function of the central transmitting frequency and of the intermediary frequency Fo1 = FS - F1 .

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