How should you terminate a radio contact that is complete and no longer requires a reply?

• A. End the transmission with "Stop" and hang up.
• B. Use "Out" to indicate the transmission is complete and no reply is expected.
• C. Say "Over and out" to ensure no further transmissions.
• D. Silence the microphone after speaking.

Answer: (B)

Ending a radio contact clearly means signaling that the conversation is finished and no reply is needed. The best way to do this is to use the term “Out” after your message. It communicates directly that the transmission is complete and no further response is expected, which keeps the channel clear and prevents unnecessary back-and-forth.

Other options don’t fit as well because they don’t provide a clear, standard indication of termination. Saying something like “Stop” isn’t a recognized radiotelephony closure, and “Over and out” combines signals in a way that isn’t used in professional practice and can be confusing. Simply silencing the microphone after speaking gives no explicit indication that the contact is finished, leaving the other party unsure whether they should respond.