This paper demonstrates that rather than spot phase noise measures, a more relevant criterion for TV modulators is the Total Integrated Phase Noise (TIP Noise) obtained by integrating the phase noise density over a frequency band centered about the picture carrier frequency. TIP noise is measured in degrees RMS and thus provides a meaningful measure of the total phase fluctuations of the RF phase.
The effects of phase noise in a coherent headend is also discussed and the TIP Noise criteria is used to explain several known phase-locking degradation effects that have been observed. It is shown that the improvements expected in phase-locked coherent head-ends cannot be fully realized unless modulator TIP Noise is better than 5 degrees RMS. Modifications that improve TIP Noise deficiencies in modulators are presented.
See the PowerPoint presentation linked below.