Discussion
Why is PM rarely used for analogue broadcasting?
Answer: A
In practice pre-emphasised FM matches PM's noise behaviour while keeping the simpler discriminator and the established infrastructure, so there was never a strong case for switching. PM carries music perfectly well in principle. Its bandwidth at a comparable index is similar rather than far greater. And high-power PM transmitters present no special difficulty. The answer is one of engineering history and installed base as much as physics. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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