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Your call sign must be provided clearly so that all listeners can understand. On an FM repeater you do not have to use phonetics to identify your station. When operating in FM mode simply state your call sign. If a listener is unable to discern alike sounding letters within your call sign, you may be asked to restate your call sign phonetically. In this case you are responsible for making sure the listener is able to identify your station. The FCC does not require you to initially identify using phonetics, however, you are required to identify your station clearly so that it may be understood. Your call sign must be provided clearly so that all listeners can understand. On an FM repeater you do not have to use phonetics to identify your station. When operating in FM mode simply state your call sign. If a listener is unable to discern alike sounding letters within your call sign, you may be asked to restate your call sign phonetically. In this case you are responsible for making sure the listener is able to identify your station. The FCC does not require you to initially identify using phonetics, however, you are required to identify your station clearly so that it may be understood. As an alternative, using international code (CW) is considered by the FCC to be an absolute valid means to identify your station.