Thank you all. It happens with every source and sink. However the frequency
changes depending on what source I use which tells me it could not be the
cable. I use laptop or PC and monitor.
On Thursday, May 15, 2025 at 09:19:28 AM PDT, John Woodgate
<[email protected]> wrote:
I agree: a cable only radiates what it is fed. If it is properly terminated,
circuit-wise and shielding-wise, it's being fed too lavishly. In this case, the
good shielding indicates high common-mode current in the shield. It could be
interesting to measure the emissions with a cable shield connected at the
sending end only. This obviously stops the CM current, but the CM then appears
as voltage on the shield. Interpreting the results requires thought; one
deduction might be the internal impedance of the source of the CM, leading to
identifying the source.
On 2025-05-15 16:55, Ted Eckert wrote:
Hi Peter,
The last time I had a similar problem with HDMI, the issue wasn't the cable.
The host device had an improper PCB layout for the HDMI signals. Paired signal
traces weren't properly matched leading to extra noise. Is your issue with just
one host product or with multiple products?
Ted Eckert The opinions expressed are my own and do not necessarily reflect
those of my employer. From: [email protected]
<[email protected]>
Sent: Thursday, May 15, 2025 8:43 AM
To: [email protected] <[email protected]>
Subject: [EXTERNAL] [PSES] HDMI cable emissions
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Hello group,
I am working on a HDMI cable where it does not pass radiated emissions with
good margin. I have great braid coverage and have soldered the braid to the
connector shell and have fully sealed and covered it with copper tape. Is there
anything else that I need to do? My issue is mainly at below GHz when I use
1080P resolution.
Thank you
Peter
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Best wishes John Woodgate RAYLEIGH Essex OOO-Own Opinions Only www.woodjohn.uk
If something is true: * as far as we know - it's science *for certain - it's
mathematics *unquestionably - it's religion
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