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MC44C402ACR2 Datasheet(PDF) 8 Page - Freescale Semiconductor, Inc |
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MC44C402ACR2 Datasheet(HTML) 8 Page - Freescale Semiconductor, Inc |
8 / 12 page 8 Freescale Semiconductor MC44C402 SETTING LEVEL FOR MODULATOR/ENCODER INTERFACE 1. Verify calibration of the equipment. This requires a modulator and precision signal source. The audio signal cannot be passed through the stereo encoder for this setup. Suggest using 10396.48 Hz audio test signal directly into first Bessel null on a spectrum analyzer. The null will occur at precisely 25 KHz deviation of the 10396.48 Hz audio test signal. Please see Figure 8 for test equipment setup. 2. Input 1800 Hz @ 0.4 V p-p into left channel and set adjust attenuation between stereo encoder and the modulator for optimum separation using calibrated demodulator and decoder. Figure 8. MC44C402 Level Setup Audio Generator Precision Demoodulator TEK 1450-1 Precision MTS Decoder Modulation Sciences SRD1 Audio Spectrum Analyzer Modulator No Audio Pre-emphasis Stereo Encoder Spectrum Analyzer Audio Analyzer Audio Precision SYS2 Wide Band Output Composite Video Left In Right In Adjust for optimal separation with only Left channel driven 1800Hz 44C402 Level Setup Input Left Channel only 1800Hz 400 mV p-p CVBS in 4.5MHz Notch Filter 0db / 25KHz deviation = 1.45Vp-p @ 1KHz Mono (both channels driven) Demodulator / MTS Decoder Calibration 25KHz deviation Check = 1 0396 Hz @25KHz deviation gives bessel nul l and Ref Level on SRD-1 Composite Video Attenuator 1) Calibrate MTS Decoder to Demodulator connection using Bess el Null Technique 2) input 1.8KHz 0.4 V p-p on left channel only and optimiz e stereo separation with attenuator. |
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