[ARC5] BC sets and others.

[Rob Atkinson]

On Wed, Jan 22, 2014 at 10:19 AM, Geoff <geoffrey at jeremy.mv.com> wrote:
> That is not completely accurate. Analog stations are allowed 10 kc total
> bandwidth at full power with a rapid drop after that and nothing beyond 10
> kc per sideband.

That may have been true at one time; not sure about that, however FCC
adopted the NRSC "mask" which defines stepped attenuation of the
sidebands starting out at 10.2 kc from carrier and continuing out.
Nothing closer in.  Most stations operate with NRSC (National Radio
Systems Committee) compliant processors that employ treble boost
(pre-emphasis) to compensate for the lousy modern AM receiver high
frequency roll-off.  They have a low pass filter cutoff usually around
9.5 kc.  This all began around 1990.

Rob
K5UJ