I used to sit and listen to LA radio stations in my car, in Hawaii
On Oct 19, 2015 9:54 PM, "Harold Hallikainen" <harold@hallikainen.org>
wrote:

>
> >
> > I wonder if we shouldn't drop the acceptable levels 10dB or so.
> > Those regs were written when the average person might have one or two
> part
> > 15 devices.
> > I can usually get down to where they system is below the noise floor of
> > the
> > test house SA without any trouble.
> >
>
> I'm impressed that you can get stuff that quiet! The class B (residential=
)
> limit is about 10dB below the class A (non-residential) limit. I can
> normally meet class A pretty well, but B is tough! The FCC limits for
> conducted emissions (back down the power line) are from 150kHz to 30MHz (
> http://www.hallikainen.com/FccRules/2015/15/107/ ). Radiated limits are
> above 30MHz (http://www.hallikainen.com/FccRules/2015/15/109/ ). There
> always seems to be some harmonic way up there.
>
> Unintentional radiator noise has pretty much destroyed AM broadcast. The
> higher frequencies get noise, but not as much.
>
> Harold
>
>
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