Ralph,
Your intentional radiator interference is most like due to the fact that
the transmitters are illegally generating too much power. I agree, the limit
for FM transmitters is very low and typically only have a range of a hundred
feet (eg 48 dBuV/m at 3 Meters). I am assuming the ones you are going by are
putting out a lot more power, or just fail the regular unintentional emissions.
I do know exactly what you are talking about. I got sick of cars going by
and changing my listening preference to Howard Stern ;-0
Most products could actually meet class B, but unfortunately with the
downsizing of the economy, not many companies have the resources and/or
personnel to properly design products these days.
Larry
________________________________
From: [email protected]
[mailto:[email protected]]
Sent: Friday, January 07, 2011 5:05 PM
To: ce-test, qualified testing bv - Gert Gremmen
Cc: [email protected]
Subject: Re: [PSES] Are EN 55022 Class A Limits Permissible?
I've long wondered what those limits are really protecting. I often get
interference on my car FM radio from other cars using intentional radiators
(CD to FM transmitters I suspect). I wonder how often FCC receives complaints
about TV or radio RFI these days. I'll bet 99 out of 100 are false alarms.
I not suggesting we get rid of the limits, but rather that Class A should be
suitable for all products, residential included. I suggest Class B limits
had their place, 30 years ago.
_______________________________________
_____________________________________________
Ralph McDiarmid | Schneider Electric | Renewable Energies Business |
CANADA | Regulatory Engineer
From: "ce-test, qualified testing bv - Gert Gremmen" <[email protected]>
To: [email protected]
List-Post: [email protected]
Date: 01/07/2011 04:06 AM
Subject: Re: [PSES] Are EN 55022 Class A Limits Permissible?
________________________________
That is a can of worms.
The European Commission forbids regulatory statements in harmonized
standards, and so this clause is illegal. From this point of view the
class A statement in a product stops the presumption of compliance.
(if sold in Class B = residential) environments.
At the other hand, a substantial part of IT products on the market in Europe
is class A, and I still did not hear about any problem with that (but
interference
of course, but who cares about that).
The problem lays (IMHO) at Cenelec and the IT lobby.
There ARE other points of view..... please please
Regards,
Ing. Gert Gremmen
[email protected] <mailto:[email protected]>
www.cetest.nl
Kiotoweg 363
3047 BG Rotterdam
T 31(0)104152426
F 31(0)104154953
Before printing, think about the environment.
Van: [email protected] [mailto:[email protected] <mailto:[email protected]> ]
Namens Tony T
Verzonden: Friday, January 07, 2011 12:31 PM
Aan: [email protected]
Onderwerp: Are EN 55022 Class A Limits Permissible?
Your advice would be appreciated.
EN 55022 is listed in the OJ hence IT products meeting this standard can
presume to conform to the EMC Directive? (In respect of emissions- other
standards are required to be applied.)
EN 55022 permits using the less stringent Class A limits providing a warning
is given in the User Manual that the product may cause radio interference
which the user may be required to sort out or mitigate. This seems to be
acknowledging that Class A limits may not be sufficiently low to reasonably
safeguard other equipment from interference detrimental to its operation.
However, the Directive's (Essential) Protection Requirements, Annex I 1. (a)
does not permit interference to other equipment.
Is there any generally accepted solution to this apparent paradox - or am I
concerned about nothing? Is the warning stipulated by EN 55022 literally
intended to mean 'Radio', as in a broadcast or other radio receiver or 'Radio'
in the broader sense of radiated or conducted RF disturbance?
Thanks in advance for any assistance,
Tony
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