Electronic circuit capable of stably keeping a frequency during

Details Electronic circuit capable of stably keeping a frequency during Electronic circuit capable of stably keeping a frequency during

1984-12-28

1986-12-30

Ng, Jin F.

Telecommunications

Transmitter and receiver at separate stations

With control signal

455 71, 455 12, 455113, 455118, 455119, H04B 100

Patent

active

046335102

ABSTRACT:
In a radio communication system, a transmitting section of a substation comprises a controlling circuit (21) for controlling a carrier frequency of a local oscillator (24) in response to a frequency deviation signal. A burst generating circuit (26) generates a burst in response to the input signal, a burst control signal, and a local oscillation signal of the carrier frequency. The transmitting section further comprises a holding circuit (34) responsive to a frequency control signal and the burst control signal. During presence of the burst control signal, the holding circuit holds the frequency control signal received before a beginning of the burst control signal to keep the carrier frequency of the local oscillation signal invariable until an end of the burst control signal. Otherwise, the frequency control signal passes through the holding circuit as it stands. Consequently, the carrier frequency of the local oscillation signal is controlled only during absence of the input signal and is kept invariable during presence of the input signal.

REFERENCES:
patent: 3331071 (1967-07-01), Webb
patent: 4066845 (1978-01-01), Kishi
patent: 4326297 (1982-04-01), Sato et al.

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