neve...@comcast.net wrote (in <083120050359.15859.43152B06000C800700003DF32206999735CECE020A900A02@comc ast.net>) about 'Analog telephone - RF field susceptible', on Wed, 31 Aug 2005:
>Electret microphones, actually a transistor in the mic, can also be >susceptible. The handset cable picks up the field, delivers RF to the >mic, where it gets demodulated, and then the demodulated audio noise is >fed back to the mic circuit on the phone. Electret microphone capsules with an internal by-pass capacitor are now manufactured for this reason. -- Regards, John Woodgate, OOO - Own Opinions Only. Deadlines are 90% of deadliness. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
