Which Q signal indicates that you are changing frequency?

The signal that indicates you are changing frequency is QSY. This particular Q signal is used in amateur radio communication to convey the action of moving your operating frequency, whether for a specific reason or just to find a clearer channel. It is an important part of the Q code, which allows amateur operators to communicate efficiently and clearly, particularly in situations where voice communication might be hindered by language barriers or poor signal quality.

The other Q signals provided serve different purposes. QRU generally indicates that you have information to communicate but does not pertain to changing frequency. QSL is used to confirm that a message has been received, often related to the acknowledgment of the communication rather than any frequency changes. QRZ denotes that the operator is calling for a specific station, again not related to changing frequencies. Thus, knowing the specific meanings of these Q signals can greatly enhance operational efficiency and clarity in amateur radio communications.