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A: People don't always get to know when their last transmission will be their final transmission in a communication. Life is very dynamic and so is radio. Conditions might change. You might not be able to make further contact with another station. You might be on a repeater and another ham moves in and talks over you. You just don't always get to know when your last chance to talk will be. You could ID at the end of each transmission to play it extra safe, and some hams do this. It's just not necessary, and your intent will be the deciding factor when such an oversight is observed. When saying 73 - good bye then be ensure to include your call sign. If you're going to stick around and monitor, then don't worry about it.A: Not extremely worried. People don't always get to know when their last transmission will be their final transmission in a communication. Life is very dynamic and so is radio. Conditions might change. You might not be able to make further contact with another station. You might be on a repeater and another ham moves in and talks over you. You just don't always get to know when your last chance to talk will be. You could ID at the end of each transmission to play it extra safe, and some hams do this. It's just not necessary or even slightly annoying. It's your intent that will be the deciding factor when such an oversight is observed. When conveying 73 and good bye then be ensure to include your call sign. If you're going to stick around and monitor, then don't worry about it. A communication is somewhat ambiguously defined in legal terms and a ham might consider occasional statements made throughout the afternoon all part of the same communication. It is only definitive when you clearly state that you're departing and one common method is to state, "This is A0NEW and I will be clear on your final." This method is not only FCC compliant, but clear and polite. '''Q: Do I have to clear my station?''' A: No. You have to give your call sign when concluding with your final transmission when it is known to you that the transmission will be the final transmission in a communication, as explained already. You do not have to announce that your station is "clear." You can be curt about it and just say your call sign and nothing more, forever! It isn't necessarily friendly however it is not a violation either. Just make sure you ID when you're supposed to.