| 摘要 |
PURPOSE:To detect easily a fault of a circuit from which a burst form signal is transmitted with simple circuit constitution as well by detecting the fault with an exclusive OR between an input signal and an output signal of a transmission circuit. CONSTITUTION:An intermediate frequency band directional coupler 10, a diode detector 11 and a DC amplifier 12 are fitted to an output section (or an input section of a transmission frequency converter) and a comparator 13 is connected to them so as to obtain a rectangular wave in response to an input burst signal, and a similar comparator 17 is fitted to a signal detection circuit at the output side of a transmitter, both the rectangular wave signals are ORed exclusively by an exclusive OR circuit 5 so as to detect a fault of a device (in this case, a transmission frequency converter 2 and a power amplifier 2) independently of the presence of a signal. |
