| 摘要 |
PROBLEM TO BE SOLVED: To speedily detect the presence of a radio equipment different from the hopping timing of its own station at the point of time when an opposed radio equipment sends radio waves by allowing a timing monitoring circuit to output a hopping synchronization step-out detecting signal when the inequality of hopping timing is detected. SOLUTION: A received signal monitoring means 211 is interposed between the timing monitoring circuit 22 and a receiving circuit for monitoring 201 to monitor whether radio waves are transmitted by the ratio frequency of a monitoring object. At the same time when radio waves are transmitted by the radio frequency of the monitoring object, the content of the data is confirmed to give information on the result to the circuit 22. The circuit 22 confirms whether the means 211 is matched with the hopping timing of its own station. Then, only when it is not matched with the hopping timing of its own station, a hopping synchronization step-out signal is outputted to a communication control circuit 17. |
