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1.NTSC梳状滤波器时钟调整按图4将电源、彩条信号发生器和数字频率计接入调整板,并使数字梳状滤波器工作在NTSC制状态,调微调电容器CZ50,当频率计接DQZ34(24)脚时,读数为3.579545 MHz;当频率计接DQZ34(17)脚时,读数为14.31818 MHz即可。
1.NTSC comb filter clock adjustment According to Figure 4, the power supply, color bar signal generator and digital frequency meter access adjustment board, and the digital comb filter work in NTSC state, fine tune the capacitor CZ50, when the frequency meter When connected to DQZ34 (24) pin, the reading is 3.579545 MHz; when the frequency meter is connected to the DQZ34 (17) pin, the reading is 14.31818 MHz.