| 摘要 |
PURPOSE:To shorten a search time and also to prevent an error in searching, by varying a search speed in accordance with set frequency. CONSTITUTION:In case of frequency whose loop gain is large, vibration is large, T1' time is required for entering into a lock range f0 fL, and after that, T2' time is required for entering into a range f0 fS in which reception exists. On the other hand, in case of frequency whose loop gain is small, vibration is small, T1'' time is required for entering into the lock range f0 fL, and after that, T2'' time is required for entering into the range f0 fS in which reception exists. In this case, the time T1', T2', T1'' and T2'' are functions of the loop gain of frequency in that case, therefore, by measuring the time required for entering into the following lock signal generating range from switching of a channel, the time required for entering into the generating range of a signal which has reception thereafter can be calculated. In this way, the time for checking whether reception exists or not can be varied by setting frequency, therefore, the search time is shortened. |
