Verily long gone, eventually, all of us, but the success of good "EMI" design reflects in good "digital design" reflects in good "RF design" reflects in good "microwave design" reflects in "mm wave design" reflects in good "terrahertz design."
Optical computation, someday. X-ray digital processors, eventually. Next? Storing information in the spin-states of electrons. Not unimaginable. Mike Violette Washington Laboratories & American Certification Body mi...@wll.com +1 240 401 1388 On Jun 4, 2014, at 1:43 PM, Pettit, Ghery wrote: > Dennis, > > Correct. In fact, the required notice on the product or in the manual > explicitly states that your Part 15 device is not offered any protection > against interference. Of course, it isn't supposed to cause any > interference, either. The limits were designed to provide a reasonable level > of protection against interference to radio services (and television is just > radio with pictures). Protect your neighbor from you. Not you from > yourself. And in this case the limits have been wildly successful. One > could argue that the limits are overly conservative, but that's a fight I am > not going to get involved in. I'm too old and will be long gone before that > one would be remotely close to being resolved. :-) > > Ghery S. Pettit > > -----Original Message----- > From: Dward [mailto:dw...@pctestlab.com] > Sent: Wednesday, June 04, 2014 10:23 AM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] radiated emissions testing may understate actual > emissions, an example using a class D stereo amp > > I do not want to speak for Mike Violette, but what I think he is referring > to by interference is the fact that, while the FCC could care less if two > part 15 devices interfered with each other, they do care if part 15 devices > interfere with licensed services. And it is in this area that the 'issue has > been solved' by the 'amazingly conservative' class B limits. > > Dennis Ward > Senior Certification Engineer > PCTEST > This communication and its attachments contain information from PCTEST > Engineering Laboratory, Inc., and is intended for the exclusive use of the > recipient (s) named above. It may contain information that is confidential > and/or legally privileged. Any unauthorized use that may compromise that > confidentiality via distribution or disclosure is prohibited. Please notify > the sender immediately if you receive this communication in error, and > delete it from your computer system. Usage of PCTEST email addresses for > non-business related activities is strictly prohibited. No warranty is made > that the e-mail or attachment(s) are free from computer virus or other > defect. Thank you. > > -----Original Message----- > From: Richard Nute [mailto:ri...@ieee.org] > Sent: Wednesday, June 04, 2014 10:02 AM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: Re: [PSES] radiated emissions testing may understate actual > emissions, an example using a class D stereo amp > > On 6/4/2014 9:47 AM, Mike Violette wrote: > > "Class B limits are amazingly conservative, to which large populations of > devices ascribe." > > > Try using an ordinary AM radio beside a compact fluorescent lamp > as on a beside table. > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <emc-p...@ieee.org> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <emcp...@radiusnorth.net> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher: <j.bac...@ieee.org> > David Heald: <dhe...@gmail.com> > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <emc-p...@ieee.org> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used > formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <emcp...@radiusnorth.net> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher: <j.bac...@ieee.org> > David Heald: <dhe...@gmail.com> > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <emc-p...@ieee.org> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used > formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <emcp...@radiusnorth.net> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher: <j.bac...@ieee.org> > David Heald: <dhe...@gmail.com> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
