Restricted Radio Operator (RRO) Practice Exam 2025 - Free RRO Practice Questions and Study Guide

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When you hear "10-4," what does it mean?

Message received and understood

The phrase "10-4" is part of the ten-code used in radio communication, especially among law enforcement and certain emergency services. It signifies that a message has been received and understood. This code helps streamline conversations by providing concise, agreed-upon meanings for common phrases, reducing the need for longer explanations and allowing for quicker communication.

The use of "10-4" conveys clarity and acknowledgment in communication between operators, indicating that the message was not only heard but also comprehended. It enhances efficiency, especially in high-pressure or dynamic situations where every second counts. Understanding this code is essential for effective communication over radio networks, which is why recognizing "10-4" as a sign of received and understood messages is crucial for radio operators.

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