Ed and all who responded: I'm sorry to belabor this issue but I think it is generally one of awareness and perhaps may not have been raised before in such a manner. I think all of your observations are correct as Ed surmised < Consumer electronics has not been well addressed because it has been largely a voluntary requirement. My opinion is such requirements are not observed in the real world.
I am attached a PDF file called EMCAB-1 which in this country was promolgated many years ago and I think that will provide the information you ae missing. I might say that EMCAB-1 was ignored by manufacturers but the problems have persisted. I can also say that 15 years ago there were 30,000 cases a year in Cnada alone. This has dropped considerably in the last ten years but now we find consumer switch mode power supplies casuing the same problem . These are type, typically free running that do not contain microprocessors so do not fall under the Digital emissions regulations ( FCC Part 15). The harmonics from "electronic" transformers is condcuted back into the powerline and from there is re radiated by house wiring . It is not a CE problem relating to cables. My experience has been that the majority of this 'nuisance " can be removed effectively with common mode inductors which could be offered as some consumer relief. In Canada, this is the consumer's responsibility. p.s recent devices exhibiting radiosensitivity are : Infra red motion sensors, car alarms, garage door openers, baby monitors, telephones , computer speakers etc. Ralph Cameron ----- Original Message ----- From: "Price, Ed" <[email protected]> To: "EMC-PCST (E-mail)" <[email protected]> Sent: Tuesday, January 16, 2001 10:02 AM Subject: Consumer Electronics Compatibility > > Ralph: > > Would you provide a little more detail about the <30MHz Consumer Electronics > compatibility problems that you have been addressing? Are you finding that > the path is a direct galvanic connection, or is the problem caused primarily > by radiation of energy off of the power lines? What are the most common > emitting devices, and what types of devices are the most numerous victims? > And of course, what's usually the best solution? > > Thanks, > > Ed > > > > -----Original Message----- > From: Ralph Cameron [mailto:[email protected]] > Sent: Monday, January 15, 2001 7:57 PM > To: Ken Javor; dan kwok > Cc: EMC-PCST (E-mail) > Subject: Re: Site Correlation > > > > No, your message is clear, what I am saying is that the emissions below > 30Mhz cause the majority of the interference problems to consumer > electronics and that's not being addressed. > > Ralph Cameron > > ----- Original Message ----- > From: "Ken Javor" <[email protected]> > To: "Ralph Cameron" <[email protected]>; "dan kwok" <[email protected]> > Cc: "EMC-PCST (E-mail)" <[email protected]> > Sent: Monday, January 15, 2001 10:34 PM > Subject: Re: Site Correlation > > > > I must have been unclear in my previous message. The purpose of > controlling > > cable cm CE is to control the resultant cable-induced RE, which are > > controlled to protect tunable antenna-connected radio receivers, period. > > There was never any other purpose for controlling CE or RE. > > > > Ken Javor > > Ed Price > [email protected] > Electromagnetic Compatibility Lab > Cubic Defense Systems > San Diego, CA. USA > 858-505-2780 (Voice) > 858-505-1583 (Fax) > Military & Avionics EMC Services Is Our Specialty > Shake-Bake-Shock - Metrology - Reliability Analysis > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > > > > ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
