The fact that going from unshielded to shielded cable cut emissions by 6 dB does not necessarily mean that the shield cut cable emissions by only 6 dB. It could mean that the cable emissions have been greatly reduced but another part of the system has emissions that are 6 dB below the original configuration. Like pealing an onion and revealing the layers of EMI.
Dave Cuthbert Micron Technology From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Monday, February 24, 2003 7:22 AM To: Jan Vercammen; emc-p...@majordomo.ieee.org Subject: Re: Shieled ethernet cables in Germany To Jan Vercammen and Michael Nagel and the whole forum, If a decent shield only provides 6 dB of shielding effectiveness at best, that is an indictment of the termination impedance(s) and Doug Smith is right, other techniques need to be investigated for reducing emissions and immunity. Ken Javor 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
