In message <[email protected]>, dated Wed, 24 Sep 2008, N.Shani <[email protected]> writes:
>1. Is this common? Yes. >2. If we add an Ethernet hub, will it help to bring down the noise >floor? Maybe! >3. What are the common tricks used by others to suppress the noise: >ferrites (make, model?) and how many turns, filtered adapters (make, >model?) Lots of fiddly stuff! Possible instant cure: 35 to 85 MHz sounds like power supply hash. Try powering the laptops >from non-switching or 'quiet' power supplies (maybe you have lab power supplies that are quiet at RF), or even their own batteries (but don't forget to disconnect the power blocks ***from the mains supply*** in that case. I know someone who forgot!). -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! 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 [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
