The Sidetone: Why Operators Choose Their Own Beep Your sidetone pitch quietly defines your station's geometry. This guide covers choosing a pitch and matching filters, zero-beat and ears to it. Quick facts Range offered ~300-1000 Hz Common choice 550-700 Hz Fatigue lower is kinder Filter centre must match Zero-beat tune to sidetone The sidetone is the pitch your signal makes in other people's receivers when you are zero-beat - pick one your ears can live with for an evening, centre the filters on it, and the rest of the station falls into line around it. Keep learning - online morse code translator free: Morse Code Works - free Morse code tools and guides. Reference chart