What does the code 10-21 indicate?

What does the code 10-21 indicate?

• A. Call by telephone
• B. Location
• C. Acknowledgement/Message Received
• D. Signal good

Answer: (A)

In this context, the focus is understanding how ten-codes streamline radio communication. The code 10-21 means to call by telephone. It’s used when the person or unit wants to switch from radio contact to a phone line to discuss details more privately or thoroughly, without filling the radio channel. This is different from reporting a location (which is typically 10-20) and from acknowledging that a message was received (which is 10-4). The phrase about a “signal good” isn’t the standard meaning for this code, so 10-21 is best understood as a request for a telephone call.

In this context, the focus is understanding how ten-codes streamline radio communication. The code 10-21 means to call by telephone. It’s used when the person or unit wants to switch from radio contact to a phone line to discuss details more privately or thoroughly, without filling the radio channel. This is different from reporting a location (which is typically 10-20) and from acknowledging that a message was received (which is 10-4). The phrase about a “signal good” isn’t the standard meaning for this code, so 10-21 is best understood as a request for a telephone call.