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In Reply to: RE: AM Sound posted by volunteer on May 03, 2017 at 16:36:57
Definitely real. There's no technical reason that broadcast AM radio can't have almost the same frequency response as FM. Indeed, it used to -- as witnessed by passable sound quality is olden days of pre-FM-stereo multiplex when some experimental stereo broadcasts employed sister AM and FM transmitters. The main limitation of AM sound quality was poorer S/N.
Follow Ups:
"There's no technical reason that broadcast AM radio can't have almost the same frequency response as FM."
Actually, there is a technical reason..... AM radio transmissions are spaced 10 kHz apart..... If stations modulated at frequencies greater than 5 kHz, the frequencies above 5 kHz would interfere with stations broadcasting at the adjacent frequencies.
The only way a station could broadcast with greater bandwidth is if there were no transmitters broadcasting at adjacent frequencies, geographically near the transmitter in question. But in those cases, the radio would need to be modified to take in the higher frequencies. (This would be possible with communications receivers with variable-bandwidth filters.)
If AM broadcasts were changed to single-sideband, they could be be modulated up to almost 10 kHz with the same spacing..... But all radios would then have to be modified to receive stations this way.
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