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一台CSD—1—Ⅰ—1型米波彩色电视发射机播出的伴音信号杂音较大,经粗查是伴音调制器的故障所致。用100MHz示波器测量其中频输出为500mV,但发现伴音中频输出的等幅波上混有寄生振荡。于是逐级测量其电路的输
A CSD-1-I-1 type of m-wave color TV transmitter broadcast sound signal noise is larger, the rough check is due to sound modulator failure. Measured with a 100MHz oscilloscope IF output of 500mV, but found that the IF IF output amplitude mixed with parasitic oscillations. So step by step to measure the circuit’s input