| 摘要 |
PURPOSE:To make easy the preset operation, by detecting if data is written in the storage section of each preset channel, and displaying the result with illuminating (or distinguishing) state of the display device. CONSTITUTION:The high frequency stage 4 having PLL section 3 including a programmable frequency divider is swept with a presettable counter 5, and the counter 5 is stopped after being swept to a desied broadcast station. When the storing switch MSW10 is depressed, the output of a monostable multivibrator 11 is fed to the counter 5, allowing to make the counter 5 disable for preset and the storage sections 7, 8 into enable for write-in. With this state, when either one of preset switches 15- 17 is depressed, the frequency data of the counter 5 is written in one of the storage sections 7-9 via one of the RS switches 12-15 correspondingly. Data discriminators 25-27 corresponded if data is written in each storage section, and if data is written, the output of the discriminator illuminates or distinguishes display devices 28-30 corresponded. |
