What does OUT indicate in radio communications?

What does OUT indicate in radio communications?

• A. Sender ended transmission and needs no response.
• B. Sender ended transmission and needs a response.
• C. Receiver acknowledged.
• D. Signal is encrypted.

Answer: (B)

In radio communications, OUT signals that the speaker has finished transmitting and does not expect a response. You use this to close the conversation and move on, letting others know the channel is no longer open for replies. This is different from a call sign that would indicate you’re awaiting a response (like OVER) and from any indication of acknowledgment or encryption. So the best interpretation is that the sender is ending the transmission and does not want or need a reply.

In radio communications, OUT signals that the speaker has finished transmitting and does not expect a response. You use this to close the conversation and move on, letting others know the channel is no longer open for replies. This is different from a call sign that would indicate you’re awaiting a response (like OVER) and from any indication of acknowledgment or encryption. So the best interpretation is that the sender is ending the transmission and does not want or need a reply.