Frequency modulated transmitter applicable to MF broadcasting

Details Frequency modulated transmitter applicable to MF broadcasting Frequency modulated transmitter applicable to MF broadcasting

1984-11-02

1986-09-02

Ng, Jin F.

Telecommunications

Transmitter

Angle modulation

455119, 455126, 331 23, H04B 104

Patent

active

046100300

ABSTRACT:
The invention concerns a frequency modulation broadcasting transmitter 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 F.sub.S, the reference frequency F.sub.o1 being determined as a function of the central transmitting frequency and of the intermediary frequency F.sub.o1 =F.sub.S -F.sub.1.

REFERENCES:
patent: 3392347 (1965-09-01), Baylor et al.
patent: 3593182 (1971-07-01), Wheaton
patent: 3644831 (1977-10-01), Collins
patent: 4053933 (1972-02-01), Latker et al.
patent: 4282497 (1981-08-01), Hulbert
Archer et al., "A Broad-Band UHF Mixer Exhibiting High Image Rejection over a Multi-Decade Baseband Frequency Range," IEEE, Journal of Solid-State Circuits, vol. SC-18, No. 4, Aug. 4, 1981, pp. 385-392.
Okano, et al., "Crystal Oscillators Facilitate Future Frequency Control," J.E.E., Journal Electronic Engineering, No. 144, Dec. 1978, pp. 40-43.

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