Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-04-10
1980-02-12
Bookbinder, Marc E.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325 17, 325 63, 343179, H04B 700
Patent
active
041885821
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 predetermined frequencies. All the transmitters at the remote stations are phase locked to the reference signal transmitted 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 interruption has cleared, the signal conditioner is automatically phase synchronized to the reference signal and closed-loop operation is resumed.
REFERENCES:
patent: 2067353 (1937-01-01), Snow
patent: 3862365 (1975-01-01), Kobayashi et al.
patent: 4117405 (1978-09-01), Martinez
patent: 4119912 (1978-10-01), Nagy et al.
Cannalte Gary A.
Chapman Ronald H.
Rozanski, Jr. Walter J.
Bookbinder Marc E.
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
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