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Line 33: ==Use for transmit keying== In many [[radio modem]] implementations, especially in amateur radio, the DTR is used to control transmission. The radio receives when DTR is not asserted, typically passing audio in to a software modem. When DTR is asserted the radio transmits audio coming from the software modem. In cases where the radio is controlled by serial commands (e.g. a [[computer aided transceiver]] interface) the control data flows regardless of DTR state. ==See also==

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