[BC] Radiators...

[Burt I. Weiner]

Harold,

For the most part we've discussed intentional and unintentional 
radiators.  As you point out there is also a definition of an 
"incidental Radiator".  In the EMI/EMC world, the Incidental Radiator 
does fall into the "Unintentional Radiator" world.  It basically 
comes down to two types of devices, one that is supposed to radiate 
and one that is not supposed to radiate (but does).  One other type 
of device would be ISM or Part 18.  This would include medical 
devices such as Diathermy (which I might add really help 
tendonitis!)  In the past there has always been the attitude, even 
within the Commission, that once electrical noise from motors, 
switches and even arcing types of devices becomes RF, it typically 
falls somewhere into Part 15.  "Good Engineering Practices" has 
always been open to differing opinions.

Now, if you really want to torture yourself take a look at this: 
http://www.washingtonwatchdog.org/documents/fr/02/jy/10/fr10jy02-16.html

Burt

At 08:29 AM 7/6/2006, you wrote:
>From: "Harold Hallikainen" <harold at hallikainen.com>
>Subject: Re: [BC] Is Power Line Noise Illegal?...
>To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
>Message-ID:
>         <61393.207.177.227.29.1152199716.squirrel at sujan.hallikainen.org>
>Content-Type: text/plain;charset=iso-8859-1
>
>
> > If you look at the rules regarding Part 15 and specifically,
> > "Unintentional Radiators" and depending on the field intensity of the
> > interference, the answer may very well be a definite "yes".  Power
> > lines can easily fall into the category of Unintentional
> > Radiators.  That's really the whole issue surrounding BPL. The power
> > lines are supposed to be conductors (of BPL), not radiators.
> >
> > Burt
>
>
>I think BPL would be an unintentional radiator since it intentionally
>generates RF, but does not intentionally radiate it. Power line noise,
>however, I think would be an incidental radiator, since the generation of
>the RF is not intentional. See
>http://www.hallikainen.com/FccRules/2006/15/3/ and
>http://www.hallikainen.com/FccRules/2006/15/13/ .
>
>For incidental radiators, there are no solid radiation limits. Instead,
>"Manufacturers of these devices shall employ good engineering practices to
>minimize the risk of harmful interference."
>
>Harold

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa at earthlink.net
K6OQK