| 摘要 |
PURPOSE:To receive a target reception frequency and another frequency at the same time by providing two reception circuit parts in one circuit with a receiving function, mixing their outputs by a low frequency mixer, and adjusting its level with a variable resistor for mixing control. CONSTITUTION:This is a double reception system which receive the different reception frequencies of a 1st reception part 1 and a 2nd reception part 2 at the same time by using a PLL type frequency synthesizer for a control part 3. Consequently, optional different frequencies are received at the same time by one receiver or tranceiver, which is convenient in various operation such as reception as compared with the use of another receiver, etc.
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