| 摘要 |
PURPOSE:To eliminate the need for switch operation at a slave set from the incoming to rising of power supply by raising a power of a transmission/ reception circuit of the slave set automatically from the incoming from a telephone line to a radio telephone set. CONSTITUTION:When the slave set is installed to a master set, a charging circuit 6 of the master set charges a battery 9 of the slave set. When an incoming call exists from the telephone line, an incoming signal detected by a bell signal detecting circuit 5 is sent to a microcomputer 4. The microcomputer 4 activates a bell 8 and interrupts the charging current of the charging circuit 6 in a prescribed pattern. On the other hand, a charging current detection circuit 14 of the slave set side detects the intermitting state of the charging current and sends the result to the microcomputer 4. The microcomputer 4 reads a prescribed pattern from the signal of the charging current detection circuit 14, recognizes the incoming state to conduct a switch circuit 10 thereby supplying the power to the transmission/reception circuit of the slave set.
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