Thanks, Steve. Interesting paper, but it just muddied the waters a bit more for me... I asked my PCB manufacturer for the dielectric constant of the soldermask; I do not have those layers there and it seems they should be taken into account. Maybe that will bring the calculator results closer together. I also wrote to the calculator people and asked them about their assumptions. Even after I add the soldermask layers to the CSE, I still wonder - can I trust the CSE results?
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