[HeyLaughingBoy]

That bit about PCs and phones was surprising, but I guess not unexpected. I have built many "EMI test versions" of code so various products can be taken to the test house. We don't go to those extremes: typically, we'll run as close to worst case as we can get, but nothing unrealistic. Then again, no one but us is loading code onto our devices, so it's not like a PC where you have no control over what it's running.

[negative_zero]

One company I have worked with had an internal rule for "radiated emissions": You had to be 10dB (1 order of magnitude) underneath the limits before going for a formal cert. Non-negotiable.

Part of the reason for this rule was that they:

1) OEMed their products.

2) Sold products that could be used in complex and bespoke CAN networks with goodness knows what else.

3) There was a chance of interfering with Marine VHF radio which is used for emergencies. The EU rules were (still are) not actually strict enough for preventing interference with that band.