This issue about HDMI cables must raise the question: if ALL commercially-available cables are as bad as has been reported, then should not the AV equipment manufacturers take that into consideration when designing their products, and thus make those meet the emissions & immunity requirements without the need for something that is not actually available to the consumers who will buy them?
John E Allen W. London, UK From: Schmidt, Mark [mailto:markschm...@xrite.com] Sent: 12 January 2017 13:40 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] lowest emissions 4k TV? I too have had numerous HDMI problems in the past and as a matter of fact currently I have one now. The only long term solution is a custom cable with a properly terminated shield. I know of no cable manufacturer that does terminates the shield appropriately (I have tried many). The problem with doing this yourself is the fact that it is an expensive/time consuming step in manufacturing. You could get this cable built outside at a cable house that willing but again at a price. As you guys already mentioned, cable certification has nothing to do with proper construction of a HDMI cable for RF. Thanks, Mark From: Ghery S. Pettit [mailto:n6...@comcast.net] Sent: Wednesday, January 11, 2017 8:39 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] lowest emissions 4k TV? Brent, I ran into a problem with HDMI cables back in 2014. It seems that the HDMI specification for the cables does not address the termination of the outer shield. A cable can be marked as HDMI compliant with or without the shield being properly terminated (or not terminated at all). And, price was no indicator of whether or not the shield was properly terminated. And, boy did it make a difference on whether or not a device with an HDMI interface passed or not. I went back to our product team and suggested that they contact the HDMI committee about this. I retired from Intel a bit over a year and a half ago and had not heard back at that time if there was any result to the inquiry (or if, indeed, the inquiry had ever been made). You are correct, certification of a cable to HDMI specifications has nothing to do with shielding. I hope those of you dealing with this have some success in getting the specification changed. Ghery S. Pettit, NCE Pettit EMC Consulting LLC gh...@pettitemcconsulting.com From: Brent DeWitt [mailto:bdew...@ix.netcom.com] Sent: Wednesday, January 11, 2017 4:58 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] lowest emissions 4k TV? I don’t want to go name bashing to the whole list, but about a year ago I had the project buy a bunch of very expensive HDMI cables in various lengths to compare against the cable we designed and have built for us. This company proudly advertised “THX Certified”. It appears that certification has little to do with shielding. That, or the manufacturer sent THX something very different than what they sold me, because they were some of the worst cables I’ve ever seen in terms of radiated emission characteristics. Dissection of one showed a ½ inch drain wire as the only shield to shell connection on a 4k advertised product. It ends up that our Bose branded cables are about as good as anything I can find. 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