Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1995-04-28
1997-02-18
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455 331, 455 501, 455283, 455296, 330289, 343890, 333 99R, 361722, H04B 700
Patent
active
056049250
ABSTRACT:
A method and multicoupler for a receiver at a base station in a cellular/PCS radio communication system includes a cooled container that is mounted on an antenna tower at the base station. The container is mounted on the antenna tower adjacent an antenna and contains thereinside a preselector filter, a highly linear amplifier, and a directional coupler that are cooled to a temperature less than 175.degree. K. and greater than 100.degree. K. A power splitter is connected between the output from the container and the radio system receiver, and is located at a ground station near the base of the antenna tower. Cooling the components inside the container, particularly the amplifier, to a temperature of about 150.degree. K. reduces the noise from the multicoupler so that base station range is extended, building penetration is improved, and subscriber transmit power may be reduced. The multicoupler may also be used for duplex channels, and in this event a transmit filter may also be cooled to reduce transmit power dissipation by the filter.
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Little, W. A. & Sapozhnikov, I.; "Development of a Low Cost, Cryogenic Refrigeration System for Cooling of Cryoelectronics"; pp. 1-8. 1994.
O'Malley John P.
Rinard William J.
Williams Rodney O.
Eisenzopf Reinhard J.
Raytheon E-Systems
To Doris
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