In the US, I understand that the FCC requires a type certification report for all electronics devices, at least for consumer devices under Class B (or is it A?, the consumer/home class is more stringent than the industrial class). As I recall, it matters not that the device’s purpose is to be a transmitter. Hence TVs and whatnot have to have a type cert.
Part 15 transmitters have lots of regulations depending on the frequency band and modulation methods, e.g., sub-GHz rules are far more strict about duty cycle and freq. hopping. The onerous specs are the emissions mask (channel power/bandwidth) regulations. And Japan, France and others are far more stringent that the US.