I'm not a lawyer either... but I was a ham. The issue is Part 15 type acceptance. In the case of a software-controlled radio, the firmware that controls the card would be part of the type-accepted unit -- and whatever part of that might run on the host PC would thereby *also* be part of it.
No, this is not authoritative with citations, either, but hopefully, it at least clarifies what people are asserting is the issue.
Copyright © 2018, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds