Communications repeater monitoring system
US4941198A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1987 |
| Grant date | Jul 10, 1990 |
| Priority date | — |
| Expiry date | Nov 12, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/60
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.