Hi, Cass— If your company’s PCB inspection team uses x-ray equipment ask if they will take a few pictures for you. Dissecting suspect cables is certainly valuable and often essential, but you can also learn quite a lot about which shielded cables are “good” or “bad”, not really shielded at all, twisted/terminated well or not, etc via x-ray. Not all expensive brand name cables stack up, and the internal construction of what you purchased last year may have changed considerably without any outward indications.
Good luck, Chet From: Adam Dixon <[email protected]> Sent: Thursday, April 29, 2021 10:24 AM To: [email protected] Subject: Re: [PSES] EMC/EMI Cables Think Before You Click: This email originated outside our organization. I haven’t dissected an HDMI cable in a couple of years, but the HDMI Adopters consortium calls out lower EMI for 2.1-compliant cables: https://www.hdmi.org/spec21sub/ultrahighspeedcable Any cable labeled as 2.1-compliant should still be dissected. Cheers, Adam in Atlanta [email protected]<mailto:[email protected]> On Thu, Apr 29, 2021 at 11:14 AM John McAuley <[email protected]<mailto:[email protected]>> wrote: There is a company called Sewelldirect that used to provide a well shielded HDMI cable. They had a webpage on the subject. However, I can’t find it on their website anymore. Apple sell a properly shielded HDMI cable. BR John McAuley From: Ken Wyatt <[email protected]<mailto:[email protected]>> Sent: 29 April 2021 15:54 To: [email protected]<mailto:[email protected]> Subject: Re: [PSES] EMC/EMI Cables The only sure way to qualify an HDMI cable manufacturer is to dissect the connector - cable termination and check for pigtails. https://interferencetechnology.com/hdmi-cables-emi/ The article references some original investigations by Begey and Altland (DesignCon 2008). Cheers, Ken _______________________ I'm here to help you succeed! Feel free to call or email with any questions related to EMC or EMI troubleshooting - at no obligation. I'm always happy to help! Kenneth Wyatt Wyatt Technical Services LLC 56 Aspen Dr. Woodland Park, CO 80863 Phone: (719) 310-5418 Web Site<http://www.emc-seminars.com> | Blog<https://design-4-emc.com> The EMC Blog (EDN)<https://www.edn.com/electronics-blogs/4376432/The-EMC-Blog> Subscribe to Newsletter<http://www.emc-seminars.com/Newsletter/Newsletter.html> Connect with me on LinkedIn<https://www.linkedin.com/in/kennethwyatt/> On Apr 28, 2021, at 12:45 PM, Larry K. Stillings <[email protected]<mailto:[email protected]>> wrote: L-Com seems to have a good understanding on how to construct HDMI cables with 360 shields https://www.l-com.com/audio-video-hdmi-cable-assemblies Known problem for quite some time now Larry K. Stillings Compliance Worldwide, Inc. Test Locally, Sell Globally and Launch Your Products Around the World! 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Opinions, conclusions and other information in this message that do not relate to the official business of my firm shall be understood as neither given nor endorsed by it. From: Cass Carmanico Sent: Wednesday, April 28, 2021 2:24 PM To: [email protected]<mailto:[email protected]> Subject: [PSES] EMC/EMI Cables Hi guys, I am having issues with getting audio/video product to pass the class A limit. I've narrowed it down to the HDMI cables. Even the ones with the ferrites on both ends are inconsistent. Does anyone have a recommendation on where to find good EMI/EMC HDMI Cables. Thanks, Cass ---------------------------------------------- This e-mail and any attachments may contain information that is confidential to Ross Video. If you are not the intended recipient, please notify me immediately by replying to this message. Please also delete all copies. 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