Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1994-07-26
1996-08-20
Faile, Andrew
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
455115, 455129, 343703, H04B 1700
Patent
active
055488200
ABSTRACT:
In a communications system including a base station coupled to a transmission antenna by means of a transmission feeder cable, and coupled to a receiving antenna by means of a receiving feeder cable, a method and system for testing the antennas and feeder cables includes a testing apparatus located at or near the antenna end of the feeder cables. A processor located within the testing apparatus initiates tests in response to commands received from the base station by means of a digital interface, which preferably uses one or both feeder cables as a communications medium. The testing apparatus includes directional couplers for each of the feeder cables, and corresponding power detectors for measuring both forward (incident) and reverse (reflected) power. A test tone generator places a known signal on the receiving feeder cable to enable the receiving antenna VSWR to be measured, as well as to transmit the test tone down to the base station for use in measurement of receiving feeder cable attenuation. On the transmission side, incident power of a known signal supplied by the base station to the transmission feeder cable may be measured by the transmission power detector at the top of the transmission feeder cable. Measuring the amount of power reflected back by the transmission antenna then enables determination of the transmission antenna VSWR. All test results may be sent back to the base station, by means of the digital interface, for further analysis and status reporting.
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"Directional Power Meter NAUS", Burkhart, News from Rohde & Schwartz, vol. 13, 1973, pp. 13-15.
Faile Andrew
Telefonaktiebolaget LM Ericsson
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