| 摘要 |
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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