<20010622153414.IIQD20390.femail2.sdc1.sfba.home.com@[65.11.150.27]>, Ken Javor <[email protected]> inimitably wrote: > >Mr. George's comment is a very high level discussion which does not address >the important technical detail I mentioned earlier. A clock dithered more >than 120 kHz will appear to wander in and out of the CISPR 22 receiver >passband, and the measured amplitude of the peak while in the pass band will >be an average related to how long it spends in the passband compared to the >filter time constant. But if the frequency where the measurement is made is >used for commercial purposes by TV broadcasts with a 4 MHz channel >bandwidth, the dithering may not take the signal outside the bandpass at >all, and the dithering may actually cause more interference effect than if >the signal was purely cw (this last purely conjecture on my part, but very >easy to measure per one of my earlier communications).
You are potentially correct, but I believe this has been investigated for analog TV and no problem was found. However, the European DTT transmissions appear to be unexpectedly vulnerable. More investigation is necessary. -- Regards, John Woodgate, OOO - Own Opinions Only. Phone +44 (0)1268 747839 Fax +44 (0)1268 777124. http://www.jmwa.demon.co.uk Why not call a vertically- applied manulo-pedally-operated quasi-planar chernozem-penetrating and excavating implement a SPADE? ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
