Since the information was asked for higher up in the thread, I thought I would point out the following.
For NTSC LD, the carrier frequency (corresponding to blanking level) is 8.1 MHz ; sync tip is at 7.7 MHz, and white peak at 9.3 MHz.
For PAL LD, the corresponding figures are 7.1, 6.8, and 7.9.
It can be seen from this that PAL LD, despite its wider bandwidth, has a smaller deviation. The result of this much lower index of modulation is that the signal-to-noise ratio is unavoidably impaired. The reason for this is simply that the inner radius of the PAL & NTSC discs is the same, & the highest frequency which can be recorded is dependent on the minimum pit length ; if the inner radius had been increased somewhat, by reducing the playing time from 36 to 30 minutes/side in CAV (from 54 000 to 45 000 tracks), keeping the outer radius in the same place, a higher carrier frequency could have been used, allowing a greater index of modulation.
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