| 摘要 |
PURPOSE:To make an intermediate frequency and a transmission carrier stable by controlling a reference oscillator in following to a reception frequency. CONSTITUTION:As soon as the reception frequency is held by a carrier recovery part 102 of a received burst, a frequency measuring instrument 17 measures the frequency. The result of measurement of the frequency thus obtained is sent to a frequency comparator 18, it is compared with an intermediate frequency reference data stored in advance in a memory of the frequency comparator 18 and a correction data corresponding to the difference frequency is outputted. The reference oscillator 13 is controlled in response to the frequency correction data. Thus, the intermediate frequency is made constant without the use of an expensive reference oscillator and the oscillated frequency of a transmission carrier oscillator is made stable. |
