| 摘要 |
PURPOSE:To generate a signal stable over a wide band, by providing a variable frequency oscillator, a frequency-divider, a mixer, a switch circuit and a filter. CONSTITUTION:Frequency components in 120-240MHz, 30-120MHz, and 3- 30MHz, are picked up as the 1st-3rd components as conventional systems. The output of an oscillator 1 is 1/2-frequency-divided at a frequency divider 5, the result is inputted to a mixer 11 with the output of a crystal oscillator 10 to pick up the component difference, which passes through a filter 12 and the component of 3-30Mhz is picked up from a changeover contact 54 as the 3rd output by selecting SW4. The output of the oscillator 1 is 1/2-frequency-divided at the frequency divider 5 and 1/10-frequency-divided at a frequency divider 10, the output of the crystal oscillator 10 is 1/10-frequency divided at a frequency divider 13 and inputted to a mixer 15 with the output of the frequency divider 14, the component difference passes through a filter 16 and the component of 0.01-3MHz can be picked up from a changeover contact 55 as the 4th output by selecting a SW4. |
