Telecommunications – Carrier wave repeater or relay system – Monitoring
Patent
1987-11-12
1990-07-10
Safourek, Benedict V.
Telecommunications
Carrier wave repeater or relay system
Monitoring
455 67, 370 131, 3701101, 3701104, 375 31, H04B 160, H04B 1702
Patent
active
049411985
ABSTRACT:
A monitoring and alarm system for a radio frequency microwave communications repeater unit. A plurality of signals representative of the status of a corresponding plurality of operating conditions of the repeater unit are simultaneously generated. The signals are time multiplexed to form a combined signal. The combined signal is encoded to form a digital signal of frames of data having a frequency substantially less than the communication signal carrier frequency and preferably less than the communication modulating signal frequency, with a frame being formed of data from each of the status signals. A variable attenuator is responsive to the digital signal for varying the level of the communication signal proportionally with the value of the digital signal. The level-varied communication signal is then retransmitted. At a receiver unit for receiving the retransmitted communication signal there is an automatic gain control circuit responsive to the signal level of the received retransmitted communication signal for generating a control signal indicative of the level of the received communication signal. The digital signal is regenerated from this control signal and is decoded into a plurality of output signals corresponding to and representative of the original operating-condition-status signals.
REFERENCES:
patent: 3302113 (1967-01-01), Clay
patent: 3860870 (1975-01-01), Furuya
patent: 4228538 (1980-10-01), Scharla-Nielsen et al.
patent: 4491968 (1985-01-01), Shimp et al.
patent: 4499600 (1985-02-01), Powell et al.
Johnson Edward R.
Lutz Joseph F.
Parandoosh Ladan A.
Anderson Edward B.
Peninsula Engineering Group, Inc.
Safourek Benedict V.
Smith Ralph
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