[markus92]

It's so common that it's not an unlikely starting point. EMC is a major issue in high frequency electronics design and the raspberry pi had a history of having to redesign certain parts because of not having enough shielding.

[kingosticks]

I can find [1] on the subject which is quite interesting.

[1]: https://www.element14.com/community/people/PeteL/blog/2012/0...

[markus92]

See also https://www.raspberrypi.org/blog/tag/ce-compliance/

[kingosticks]

There doesn't seem to be much info on compliance out there for Pi 4 which must have been significantly different w.r.t HDMI.

[markus92]

Absolutely, and this was before the Pi had built-in Wifi. The norms you have to comply for are immediately a lot stricter as your device falls into a different category (telecommunications devices).