| 摘要 |
<p>PROBLEM TO BE SOLVED: To enhance a trouble detection rate, which is low in the prior art because it is executed only by self-diagnosis (BIT) for an internal circuit in the prior art without using a transceiving antenna in execution of the self- diagnosis for a radio wave transceiver. SOLUTION: In the transceiver for executing the BIT a closed loop comprising a transmission circuit 5, a transmission antenna 6, a receive antenna 1, a receive circuit 2, an analysis-processing circuit 3 and a displacement oscillation circuit 4 is formed to receive a radio wave into the receive antenna 1 using space coupling by the transmission antenna 6. The oscillation circuit 4 comparison-collates an output data from the analysis-processing circuit 3 with a modulation characteristic in an output of the oscillation circuit 4 by a collation circuit 14 to investigate the presence of abnormality, since the circuit 4 emits a signal of a prescribed radio wave dimension excepting a frequency. The trouble detection rate and analysis precision are enhanced since the BIT is carried out using the whole transceiver by forming the closed loop.</p> |
