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It doesn't know anything. "STE" is the easier one to explain. It controls transmit, not receive. When STE is enabled, when you let go of the PTT button, the radio will send a 55Hz tone for a moment. Other Baofeng radios mute the receive when they hear a 55Hz tone... whether or not the STE option is enabled, whether or not you want it. It has no (...

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