.
Buyer beware…
Ghery S. Pettit, NCE
Pettit EMC Consulting LLC
gh...@pettitemcconsulting.com
From: Ken Wyatt [mailto:k...@emc-seminars.com]
Sent: Monday, October 24, 2016 7:29 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] HDMI questions
I’d like to reinforce James’ point on
cable vendor (e.g. Molex, Amphenol, Palpilot – other
> reputable cable vendors are available) to specify a decent quality cable. Cut
> open a $1 cable from Amazon and marvel at the internal construction!
>
> I hope this helps,
> Best of luck
> James
>
>
> From: Brent
: [PSES] HDMI questions
I’ve been working with some Silicon Images (Lattice Semi) 9777 multiplexer
chips lately and would appreciate any insight list members might have. When
used at any resolution below 4k, there seems to be a 10 dB emission “pedestal”
that stands out of the baseline emission at
Hi Brent,
I have been working with HDMI for a while. It is not uncommon for us to
observe emissions at 742.5 MHz or other multiples of the fundamental 74.25
MHz pixel frequency. (Whether they are high enough to be an EMC problem is
a different story.) The HDMI data are transmitted using TMDS with
742MHz sounds suspiciously like a harmonic of the 74.25MHz max TMDS clock
rate for a Category 1 cable per the HDMI 1.3a spec. I don't have the HDMI
2.0 spec (not an adopter), but would love to know more about the test
configurations. A few thoughts/tests:
4K resolution at lowest color depth (no
I’ve been working with some Silicon Images (Lattice Semi) 9777 multiplexer
chips lately and would appreciate any insight list members might have. When
used at any resolution below 4k, there seems to be a 10 dB emission “pedestal”
that stands out of the baseline emission at several frequencies,
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