| 摘要 |
<p>PURPOSE:To decide a fault of each part inclusive of an abnormality of a coaxial cable by executing delivery of an alarm signal of a fault of a receiver, through the coaxial cable for executing delivery of a signal between the receiver and a transmitter. CONSTITUTION:A receiver alarm signal is inputted to an intermediate frequency oscillator 8 through a coil 13, a coaxial cable 4 and a coil 14. Accordingly, if the coaxial cable 4 becomes abnormal, a transmitter 8 always becomes on, and a carrier wave re-inserting circuit operating signal becomes on, by which an abnormality of the cable 4 can be decided. Also, if the receiver alarm signal is normal, and a transmitter alarm signal is abnormal, and the carrier wave re- inserting circuit operating signal is off, it can be decided to be a fault of a transmitter 30, and if the receiver alarm signal is abnormal, and the transmitter alarm signal is normal, and the carrier wave re-inserting operating signal is on, it can be decided to be a fault of a receiver 20.</p> |
