| 摘要 |
PROBLEM TO BE SOLVED: To automatically retrieve an idle channel. SOLUTION: When a frequency retrieval switch 7 is turned on, channels owned by all groups or a group set by a group setting part 5 are set automatically and successively for a receiving part 2 at prescribed time intervals by a control part 3. Then when a reception level of the receiving part 2 is equal to or lower than a prescribed level, for example, to a negligibly low level, the channel set in the receiving part 2, namely the dead channel is displayed on a display part. In addition, a voice output part 4 is controlled by a control part 3 so that voice is not outputted from the voice output part 4 during the operation. In addition, radio waves inputted from a reception antenna 1 are received according to antenna input sensitivity, and squelch sensitivity set by an antenna input sensitivity setting part 8 and a squelch sensitivity setting part 9 by the receiving part 2.
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