As yes, it did require very arcane, exotic, and expensive, techniques for the test lab to solve this one. The DUT was meant to be dirt cheap and so could/would not put in the front end selectivity necessary to limit the exposure to a very narrowband. ps. the immunity requirement was quite a bit higher.
John Woodgate <j...@jmwa.demon.co.uk> wrote: In message , dated Tue, 13 Jun 2006, Ken Javor writes >A quick calculation will show that if an immunity requirement of 10 V/m >is imposed at 105 MHz on a 420 MHz tuned receiver with a sensitivity of >100 dBm, the harmonic content at 420 MHz needs to be on the order of >100 dB down from the carrier. That is quite unrealistic even for a VHF >source for which 420 MHz is out-of-band, let alone a broadband >amplifier and antenna combination that covers (typically) 80 - 1000 MHz. Of course. You need to use very arcane methods to do that sort of test. A narrow band-pass filter at 105 MHz plus notch filters at harmonic frequencies. Complex and difficult. Even more exotic techniques are known. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex 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/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: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - --------------- ------------------------------------------------ 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/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: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
