Electronic circuit capable of stably keeping a frequency...

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

H - Electricity

03

L

328/159, 331/32,

H03L 7/14 (2006.01) H04B 1/40 (2006.01) H04B 1/74 (2006.01) H04B 7/185 (2006.01)

Patent

CA 1234604

Abstract of the Disclosure 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 oscilla- tion signal is controlled only during absence of the input signal and is kept invariable during presence of the input signal.

471131

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