Simulcast transmission system having phase-locked remote...

H - Electricity – 04 – B

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325/41

H04B 7/26 (2006.01) H04H 20/67 (2009.01) H04J 3/06 (2006.01) H04L 7/033 (2006.01)

Patent

CA 1113545

SIMULCAST TRANSMISSION SYSTEM HAVING PHASE-LOCKED REMOTE TRANSMITTERS ABSTRACT A simulcast transmission system is provided where a reference signal transmitted from a central station is utilized to phase-lock transmitters located at remote stations. The remote stations include a receiver for receiving the transmitted reference signal and a signal conditioner for conditioning the received reference signal for application to the transmitters. The transmitters include a phase-locked loop which may be followed by a multiplier for providing transmitter signals of predeter- mined frequencies. All the transmitters at the remote stations are phase locked to the reference signal trans- mitted from the central station. In the event that the reference signal transmitted by the central station is interrupted, the signal conditioner of the remote stations will operate in an open-loop fashion to provide the conditioned reference signal during the interruption. After the inter- ruption has cleared, the signal conditioner is automatically phase synchronized to the reference signal and closed-loop operation is resumed.

323758

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