Discussion
What is the FM broadcast channel spacing in most of the world?
Answer: D
FM broadcast channels are spaced 200 kHz apart, which accommodates Carson's 180 kHz plus a guard band. Nine kilohertz is medium-wave AM spacing. Twenty-five kilohertz is typical of narrowband FM land mobile channels. And a megahertz is far wider than any broadcast allocation needs. The figures are worth carrying because they anchor the abstract bandwidth arithmetic to real allocations.
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