How to adjust the adjacent frequency modulator?
Adjacent Modulator Tuning
1, TV modulator video / audio input port to join the standard video and audio test signal, the field strength meter connected to the output port, the standard demodulator then the output side of the mouth.
2. Adjust the output image and then fight the code switch so that the output carrier frequency is the required frequency.
3. Adjust the input video signal amplitude knob so that the video modulation is 87.5%.
4, using the field strength meter to measure the image carrier level, sound carrier comments, adjust the sound carrier level, so that A / V ratio equal to the design requirements.
5. Adjust the output level attenuation knob so that the output level is equal to the operating level.
1, TV modulator video / audio input port to join the standard video and audio test signal, the field strength meter connected to the output port, the standard demodulator then the output side of the mouth.
2. Adjust the output image and then fight the code switch so that the output carrier frequency is the required frequency.
3. Adjust the input video signal amplitude knob so that the video modulation is 87.5%.
4, using the field strength meter to measure the image carrier level, sound carrier comments, adjust the sound carrier level, so that A / V ratio equal to the design requirements.
5. Adjust the output level attenuation knob so that the output level is equal to the operating level.
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