True enough, but there are still automobiles out there with old, noisy, ignition systems. Heard an old VW Beetle go by lately? And to think, someone built an OATS near a freeway years ago. What were they thinking?
Fortunately, the ignition system in the plane I'm flying to dinner later this afternoon is well suppressed. We still use AM radios in airplanes for communications. Ghery S. Pettit From: John Woodgate [mailto:jmw1...@btinternet.com] Sent: Monday, July 31, 2017 11:34 AM To: 'Ghery S. Pettit'; EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] Quasipeak definition Do we have any products these days that produce such emissions? I'm not sure that a 10 kHz repetition rate ever occurred anyway. For an ignition system, 3000 RPM and 4 four-stroke cylinders only gives 600 Hz. With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk <http://www.jmwa.demon.co.uk/> J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. From: Ghery S. Pettit [mailto:n6...@comcast.net] Sent: 31 July 2017 19:16 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Quasipeak definition The QP detector was designed in the 1930s to simulate the response of the human ear to impulsive interference. The classic example at the time was the interference from ignition systems in automobiles to AM broadcast receivers, both in the car and nearby. A single click is well filtered by the ear and brain, but as the repetition rate goes up the perceived annoyance and interference goes up. By the time the repetition rate has reached 10 kHz the ear/brain combination is really annoyed and the quasi-peak detector and a peak detector respond about the same. Hope this helps. Ghery S. Pettit From: Paasche, Dieter [mailto:dieter.paas...@christiedigital.com] Sent: Monday, July 31, 2017 7:35 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Quasipeak definition How would you define the Quasipeak detector to somebody that is not EMC knowledgeable. Sincerely, Dieter Paasche Senior Product Developer, Electrical CHRISTIE 809 Wellington Street North Kitchener, ON N2G 4Y7 Phone: 519-744-8005 ext.7211 <http://www.christiedigital.com/> www.christiedigital.com This e-mail message (including attachments, if any) is confidential. Any unauthorized use, distribution or disclosure is prohibited. If you have received this e-mail message in error, please notify the sender by reply e-mail or telephone and delete it and any attachments from your computer system and records. - ---------------------------------------------------------------- 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) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> 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) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> 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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
