You might have done this yourself. After you speak on the radio, you released your PTT, then remembered that you needed to add one more thought, and pressed your PTT again to say what you just remembered. Well, that’s not so bad, right? I mean, we do it all the time on the phone. And I suppose that’s where the habit comes from, because we’re so used to speaking in full-duplex, which is that you and I can talk and hear each other at the same time.
This is a small annoyance known as double-keying. It can be irritating to the person you’re speaking with, especially if that other person believes it’s his or her turn to speak. The result is often that you two will be speaking on the radio at the same time, and unlike with a phone conversation, neither of you will have heard the other. Of course, this’ll require your friend to repeat what he or she just said.
Avoiding double-keying takes a little practice and a little patience. When you say something on the radio, then release your PTT, resist the temptation to press the PTT again, and train yourself to wait for the other person to respond before pressing yours. This might not come naturally, because we don’t talk that way, and we don’t use a PTT button when we’re on the phone.
It’s very possible that what you have to add at the end of your transmission is very important. Is it important enough to stomp on your friend’s transmission and cancel everything he or she said? Probably not. Now, are there times when double-keying is acceptable? Yes, if, for example, you’re delivering a training topic or telling a story over the repeater, it’s very acceptable to un-key, pause for a second, then resume, because nobody is expected to speak next except you. (By the way, there’s no need to say anything like pause for reset, although there’s no problem with saying it either.)