Telecommunications – Transmitter and receiver at separate stations – Short range rf communication
Patent
1987-07-24
1989-09-26
Tarcza, Thomas H.
Telecommunications
Transmitter and receiver at separate stations
Short range rf communication
455 54, 455 33, 455184, 455186, 455187, 379 57, 379 59, 379 60, 379 61, H01J 938, H04B 1116
Patent
active
048706965
ABSTRACT:
A mobile communications system having a fixed unit connected to a public telephone network by a subscriber line, and a portable unit connectable to the fixed unit by radio channels which comprise at least one control channel and a plurality of speech channels. The fixed unit includes a transmitter section having a tuner for selectively tuning the transmitter section to one of the radio channels or a first stand-by channel, the frequency of which is not used for communications in the system. The fixed unit also includes a receiving section having a tuner for selectively tuning the first receiver section to one of the radio channels. A controller section control the transmit and receive tuner such that when the fixed unit is in a stand-by condition, the first transmitter and receiver sections are tuned to, respectively, the first stand-by channel and the control channel. The portable unit also has a transmitter section and a receiver section which are coupled to a handset, the transmit section having a tuner for selectively tuning the second transmitter section to one of the radio channels and a second stand-by channel the frequency of which is not used for communications in the system. The receive section has a tuner for selectively tuning the portable receiver section to one of the radio channels. A second controller section is used by the portable unit for controlling the units transmit and receive tuners such that when the portable unit is in a stand-by condition, the portable unit transmitter section and receiver section are tuned to the second stand-by channel and the control channel, respectively.
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NEC Corporation
Sotomayor John B.
Tarcza Thomas H.
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