| 摘要 |
PURPOSE:To display digitally the receiving frequency counted in a frequency counter by applying the frequency division output of a frequency divider for a PLL circuit to the frequency counter to which the frequency of a reference frequency oscillator including a quartz oscillator for the PLL circuit is supplied. CONSTITUTION:A reference frequency oscillator 12 of the PLL circuit constituting a local oscillator 4 outputs a certain oscillation frequency, and a variable local oscillation frequency is supplied to a mixer from a voltage control oscillator 9 in accordance with a channel selection operation. Meanwhile, the frequency division output corresponding to the veriable local oscillation frequency is obtained in a frequency divider 10 constituting the local oscillator 4 and is applied to a frequency counter 20, to which the frequency from the reference frequency oscillator 12 including a quartz oscillator 13 is supplied, to count the receiving frequency, and this receiving frequency is displayed digitally on a digial display device 19 driven by a driver 18. |
