Concept调频广播 / Frequency Modulation
FM
A radio modulation technique that carries signals by varying the frequency of a carrier wave. It offers strong interference resistance and good audio quality, but the signal travels in straight lines and is significantly affected by terrain obstruction, giving a limited coverage radius. It is suited to cities and densely populated areas.
Timeline (last 90 days)
Sep 29
Aviation communications use amplitude modulation (AM) technology rather than frequency modulation (FM).
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Sep 29
FM's capture effect causes a stronger signal to completely suppress a weaker signal, which is disadvantageous in aviation safety scenarios.
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