| 摘要 |
PROBLEM TO BE SOLVED: To surely detect the fault of an amplifier. SOLUTION: A reference pilot signal is generated by converting the phase of a pilot signal into a prescribed value by means of a phase converter 5 and the level of the pilot signal amplified by means of an amplifier 6 is converted by means of a level converter 11. Then, after the reference pilot signal and the pilot signal from the level converter 11 are synthesized by means of a synthesizer 12, a level detecting circuit 13 detects the fault of the amplifier 6 from the level of the synthesized pilot signal outputted from the synthesizer 12. |
