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From: szepesi@fluke.UUCP (Les Szepesi)
Newsgroups: net.audio,net.analog
Subject: Re: Carver amplifier noise
Message-ID: <1534@vax3.fluke.UUCP>
Date: Wed, 13-Nov-85 15:18:49 EST
Article-I.D.: vax3.1534
Posted: Wed Nov 13 15:18:49 1985
Date-Received: Fri, 15-Nov-85 04:33:30 EST
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Organization: John Fluke Mfg. Co., Inc., Everett, WA
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Xref: watmath net.audio:6515 net.analog:518

> Actually not so fine.  The Carver amp may do wonderous things, but if it
> dumps trash into the AC line, it is DEFECTIVE.  Unfortunately, I don't
> know of anyone who tests for this.  UL is only concerned about safety,
> and the FCC presumably only cares about *radiated* noise, not
> conducted. (anyone know for sure?) 


The FCC *does* care about conducted noise, but at a lower frequency (tens of
megahertz rather than hundreds). The idea is that the power grid can look
like a pretty good antenna at these frequencies, since power transmission
lines are long enough relative to the wavelength. I don't remember all the
details, but conducted emissions are handled in the same docket as radiated
emissions for Class B computing devices. 

The "Computing devices" definition may exempt an audio amplifier - I believe
it is defined as anything that uses switching speed in excess of ~10kHz.

Les Szepesi
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