If a unit needs to change their radio channel, which code do they use?

The correct code for changing a radio channel is 10-52. This code is specifically designated for that purpose within the communication codes utilized by law enforcement and public safety agencies. Using 10-52 signals to other units that the individual or unit is in the process of switching channels, thus maintaining clear communication and operational efficiency.

In contrast, the other codes serve different meanings: 10-51 generally refers to a vehicle accident; 10-43 typically indicates a request for information; and 10-40 is used for mentioning an unauthorized use of a radio. Each of these codes has its own specific applications and is important for effective communication in various situations, reinforcing why the proper channel change code is crucial for maintaining order and clarity over the radio.