All supplier/maker/vendor names withheld in order to protect the innocent and minimize bias.
This may have been raised in the past, but I need a refresher and advice: helping a 3rd party to perform RE testing, and we are seeing fairly high ambient noise level that is very close to Class B (EUT is off, only support equipment on) that is in the range of 35-85 MHz broadband and is coming off the laptops. The 2 laptops are located outside the AFC and are connected to the EUT via UTPs running either 100M or 1G traffic from the on-board Ethernet ports. Attempts to use a PCMCIA card, desktop PC or dedicated traffic generator are not showing a better results (it is worse). Questions: 1. Is this common? 2. If we add an Ethernet hub, will it help to bring down the noise floor? 3. What are the common tricks used by others to suppress the noise: ferrites (make, model?) and how many turns, filtered adapters (make, model?) Thanks in advance, Naftali - ---------------------------------------------------------------- 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 [email protected] 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 [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
