| 摘要 |
PURPOSE:To increase the variable width of the frequency wider than a conventional width by connecting an output of one system of a digital controlled type frequency synthesizer group receiving an output of a VCO being a component of a PLL as a reference signal of a 1st local oscillation signal source of a pilot receiver. CONSTITUTION:A synthesizer section 3 consists of a frequency divider 31, a phase comparator 32, a loop filter 33, a VCO 34 and a prescaler 35, and an output of the VCO 34 is connected to an input of a multiplier 12 as a local oscillation signal source of a pilot receiver 1. The frequency stability of the output of a VCXO 27 and phase noise level are improved by at least the synthesizer section 3 and the total degree of multiple of the multiplier 12. Thus, a signal with very high stability is obtained at an output of the synthesizer section 3. Moreover, the frequency division ratio of the prescaler 35 is varied to change the frequency of the highly stable signal source considerably. |
