wrote in message
oups.com...

I am aware of "standard" audio processing, but the refference giving
75uS on AM through me for a minor loop. Up too long and the old brain
was a little too fogged. I tried several local AM stations with 75uS
and 50uS
and they soundeed very muffled. The exact oppositte of what I am trying
to do.


You need to have a IF about 20 kHz wide to hear the preemphasis.



I do remember when WLW (700KHz) used to run real clasical music
programs on Sunday afternoon, and they clearly broadcast up to at least
10KHz. The cymbols were crystal clear. But that was 35~40 uears ago.

Terry


No doubt. I remember the adjacent channel splatter some stations would put
out back in the late 60s and early 70s. I don't think there was a specific
FCC AM bandwidth restriction back then, the stations were just mandated to
limit interference. The FCC's minimum separation between stations in the
same market was 30 kHz, and some stations might broadcast a full 15 khz of
audio.

When the FCC reduced the channel spacing to 20 kHz in the same market they
also made a 10 kHz audio bandwidth limit official.

You could also bring this topic up in rec.radio.broadcasting. There are a
few broadcast pros there who have hands-on transmitter expirence.

Frank Dresser