Hi All, One more observation, which I forgot to mention. When i remove only the HDMI input cable (Input to the board), the radiation level drops by 5 dB, while if i remove only HDMI output cable the radiation level drops by 2dB. Both the HDMI input and output cables are same set of cables. Regards Vinod A H On Wed, May 23, 2012 at 8:47 PM, vinod ah <ah.vinod@xxxxxxxxx> wrote: > Hi Vijay, > > We have option to control the current and voltage swing. We tried > both, without violating eye test, but still the i am seeing radiation > at 742.5MHz. The radiation level keeps chnaging as i try with multiple > cables. I found the best cable i had to be failing FCC limits by 7dB. > I used some HDMI cable which are sold by big brands, but i was failing > FCC by 12dB !!!. > > Hi Boris, > > We tested the Blu ray player and TV with same HDMI cable used for our > board testing. the Blu ray player used is from Sony while the TV is > from LG, we connected the blu ray player to TV using same HDMI cable > and took the readings. > > Regards > Vinod A H > > On Wed, May 23, 2012 at 8:43 PM, Traa, Boris <boris.traa@xxxxxxxxxxx> wrote: >> Dear Venod, >> >> You said that TV is oke and Blu Ray is tested. Seperately or as a >> combination with the same cables you also used to attach your board? >> >> Kind regards >> Boris Traa >> System design engineer EMC >> >> It's the currents that make circuits work or fail. >> >> Philips Innovation Services/EMC center >> Room 2.020 >> High Tech Campus 26 >> 5656AE Eindhoven, The Netherlands >> Tel: ++ 31 40 27 43766 >> Fax: ++ 31 40 27 42224 >> E-mail: boris.traa@xxxxxxxxxxx >> >> >> -----Original Message----- >> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On >> Behalf Of vinod ah >> Sent: Wednesday 23 May 2012 3:58 PM >> To: SI-LIST >> Subject: [SI-LIST] HDMI Frequency Failing RE Test by 7dB!!!! >> >> Hi All, >> >> I am designing a board with HDMI input and HDMI output. I am facing EMI >> issue at 742.5MHz (failing FCC limits by 7dB) when running 1080p30 on both >> Input and output HDMI i.e. BLu ray player connected to HDMI input connector >> of my board is giving out data at 1080p30 and HDMI out of my board is >> connected to TV which is also 1080p30 content. So i am unable to find out >> how is 742.5MHz coming out as radiation as it is 10th Harmonic of pixel >> clock 74.25MHz!!!!!!!. I am not facing any issues with other harmonics >> except for this. So i am totally confused on how to go about debugging this >> issue. >> >> Note: All the signals are routed on top layer without vias and all signals >> have solid ground plane reference. The blu ray player and TV used, is tested >> for radiation and no significant levels seen. >> >> Regards >> Vinod A H >> ------------------------------------------------------------------ >> To unsubscribe from si-list: >> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >> >> or to administer your membership from a web page, go to: >> //www.freelists.org/webpage/si-list >> >> For help: >> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >> >> >> List forum is accessible at: >> http://tech.groups.yahoo.com/group/si-list >> >> List archives are viewable at: >> //www.freelists.org/archives/si-list >> >> Old (prior to June 6, 2001) list archives are viewable at: >> http://www.qsl.net/wb6tpu >> >> >> >> ________________________________ >> The information contained in this message may be confidential and legally >> protected under applicable law. The message is intended solely for the >> addressee(s). If you are not the intended recipient, you are hereby notified >> that any use, forwarding, dissemination, or reproduction of this message is >> strictly prohibited and may be unlawful. If you are not the intended >> recipient, please contact the sender by return e-mail and destroy all copies >> of the original message. >> ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu