What is the "Q" signal used to indicate that you are receiving interference from other stations?

The "Q" signal used to indicate that you are receiving interference from other stations is QRM. This term specifically refers to unwanted radio frequency signals that can interfere with communication, coming from other radio stations. When a ham operator mentions QRM, they are signaling that their ability to hear or communicate is compromised due to these interfering signals.

Understanding the context of Q signals can help you navigate various communication scenarios in amateur radio. For instance, QRN refers to atmospheric noise rather than interference from other stations, while QTH identifies a location and QSB indicates fading signals. Each of these signals conveys specific information, which is essential in effective amateur radio communication.