[BC] Is overprocessing illegal?

[Kevin Tekel]

I found this in the FCC rules....


Sec. 73.1570  Modulation levels: AM, FM, TV and Class A TV aural.

(c) If a limiting or compression amplifier is employed to maintain 
modulation levels, precaution must be taken so as not to substantially 
alter the dynamic characteristics of programs.


What I was trying to find is some definition of the allowed audio
bandwidth for monaural FM stations... the rules constantly refer to "50 to
15,000 Hz" but the only definite regulation regarding FM audio bandwidth
seems to be that "an FM broadcast station shall not use 19 kHz +/-20 Hz,
except as the stereophonic pilot frequency".  So is it correct that a mono
FM station only needs a 19 kHz notch filter in its audio to avoid
triggering the MPX pilot decoder in receivers, and not the traditional 15
kHz brickwall filter?



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