| 摘要 |
PURPOSE:To prevent a signal from being interrupted even at the repair by providing a signal input circular to the output side of a microwave changeover circuit. CONSTITUTION:An input terminals 23 of a circulator 2 and an output branch terminal 32 for a monitor of a transmitter 3 are connected by a cable 5. Since the level of a signal wave inputted to the circulator 2 from a monitor terminal 32 is lower than the level of the signal wave inputted to the circulator 2 through a diode switch circuit 1 from an output terminal 31, the effect at said connection state is less. In disconnecting the terminal 13 of the switch circuit 1 and a terminal 21 of the circular 2, since the terminal 21 is opened, the signal wave inputted to the terminal 23 through the cable 5 is reflected completely at the terminal 21 and obtained at the output terminal 22. In replacing the diode switch circuit 1 during this time, the signal is not completely interrupted.
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