why do airline mics sound so bad?
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Aircraft radios are an AM broadcast. AM has poorer sound quality compared with FM, but is cheaper and can be transmitted over long distances. It has a lower bandwidth so it can have more stations available in any frequency range. FM is less prone to interference than AM. However, FM signals are impacted by physical barriers.
Furthermore, the coms are much clearer aircraft to aircraft, I rarely have a problem understanding ATC. If you’re listening to recordings on the ground, that receiver may not be placed in an optimal location, so there will likely be some distortion from ground interference. Much less obstruction from terrain in the air.
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