| 摘要 |
A portable radio apparatus includes a receiving section capable of being tuned to one of a plurality of channels, a switch circuit for controlling the supply of power from a battery to the receiving section, a detector circuit for detecting the strength of an electric field which is developed on a channel, and a control section connected to the receiving section and the switch circuit whereby, in response to an output from the detector circuit, the control section scans the channels for tuning the receiving section sequentially to the channels while, at the same time, controlling the switch circuit to feed power continuously to the receiving section and, in the absence of data on a channel within a first predetermined period of time during the channel scanning, executes a saving scan ning step for repeating a cycle in which the channels are sequentially scanned once prior to interrupting the scanning for a second predetermined period of time while controlling the switch circuit to feed power to the receiving section in synchronism with the saving scanning step. |
