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Part 15 of what?

For US hams it's an extremely often cited regulation, touching on many aspects of the hobby. There's a good chance 'KB1JWQ' is a ham :)

If you or others care: https://en.wikipedia.org/wiki/Title_47_CFR_Part_15

I'm not based in the States, but it pops up enough everywhere ham-related for general familiarity.

Part 97 is the amateur radio rules in the U.S. Part 15 is the catch all of FCC rules. If it's not define in some set of rules, then it's likely covered in 15.

Part 15 says (amongst many other things) that if a service causes (or suffers) interference it must go of the air.

Nothing to do with Amateur Radio.

RFI doesn't affect amateur radio? Don't take my word for it, the ARRL have a few thoughts on Part 15:

http://www.arrl.org/part-15-radio-frequency-devices

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