Telecommunications – Carrier wave repeater or relay system – With delay or recording
Patent
1982-12-21
1984-10-23
Ng, Jin F.
Telecommunications
Carrier wave repeater or relay system
With delay or recording
455 9, 455 51, 375 70, H04B 714
Patent
active
044792450
ABSTRACT:
This invention is directed to a same frequency repeater (SFR) for use in a multiple SFR system in which only one SFR at a given time is allowed to retransmit a received signal thereby preventing simulcast distortion which could occur due to multiple SFR retransmissions. The SFR includes a receiver for receiving a signal carrying information at a given frequency and a transmitter for rebroadcasting the received signal at the given frequency. A mechanism is provided for keying the transmitter upon the reception of a received signal. A detector senses if a predetermined pilot tone is carried by the received signal. A mechanism responsive to the detection of the pilot tone inhibits the keying of the transmitter if the pilot tone is detected before the transmitter is keyed. A tone generator encodes the output signal of the transmitter with the pilot tone. The keying mechanism preferably delays the keying of the transmitter for a time period having a duration inversely proportional to the magnitude of the received signal in response to a mechanism which senses the magnitude of the received signal. The present invention further contemplates a method for the operation of such an SFR.
REFERENCES:
patent: 2719284 (1955-09-01), Roberts et al.
patent: 2734131 (1956-02-01), Magnuski
patent: 2883522 (1959-04-01), Brosch
patent: 2978699 (1961-04-01), Dodington
patent: 3745462 (1973-07-01), Trimble
patent: 3825829 (1974-07-01), Braun
patent: 4056780 (1977-11-01), Faulkner
patent: 4197496 (1980-04-01), Hiyama
patent: 4317217 (1982-02-01), Davidson et al.
Batlivala Percy P.
Kommrusch Richard S.
Gillman James W.
Motorola Inc.
Ng Jin F.
Roney Edward M.
Warren Charles L.
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