Discussion
The radio data subcarrier in FM broadcasting sits at
Answer: D
It sits at 57 kHz, the third harmonic of the pilot, which keeps it coherent with the rest of the multiplex and clear of the difference signal ending at 53 kHz. 38 kHz is the stereo subcarrier and 19 kHz the pilot. 76 kHz would be the fourth harmonic and lies outside the standard composite. The choice of a harmonic of the pilot is deliberate: it allows one reference to serve every subcarrier in the system.
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