| 摘要 |
PURPOSE:To make the transmission frequency stable, by frequency-dividing an oscillating frequency of a local oscillator used for transmission of a TV repeater and a frequency of a highly stabilized reference oscillator, utilizing that the difference between the frequency difference with a higher order multiplicating number and an intermediate frequency is a constant in frequency, and changing the frequency of the local oscillator so as to cover the deviation of the intermediate frequency. CONSTITUTION:The frequency obtained by frequency-dividing 19 and multiplying the output of the highly stable reference oscillator 18, and the frequency of the transmission local oscillator 9' are mixed at a mixer 21, and the output of the mixer 21 and the intermediate frequency are mixed at a mixer 32 again. The output of the mixer 32 and the output of a multiplier 36 are mixed at a mixer 35, the output of the mixer 35 and the output of a frequency divider 26 are applied to a phase comparator 39, whose output controls the transmission local oscillator 9'. |
