Followup: VGA RFI via KVM

Following up on my last post, the interference recurred and I got pictures.  I was watching a YouTube video here.  My resolution is 1600×900, below the native resolution for this LCD for reasons I’ve gone over before.  This example has a regular sine-wave like quality with what appears to be at least two frequency components.

And browsing Flickr:  Though there are considerable moiré artifacts in this shot (the purple and green patches—ignore them, the screen is fine), the RFI shows up nicely in the “From” text, particularly the F.

I’ll have an update when I get my filter parts in a few weeks.  I’ll bet there are a number of people with KVM’s who may have seen symptoms like these and not realized it.


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