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===FL Digi===* FreeBSD, Linux OS X, and Windows ** [https://sourceforge.net/projects/fldigi/files/ SourceForge Download], [http://www.w1hkj.com/ Developer W1HKJ]Comment: This even works using the computer microphone, although it wont be as accurate. Also works with SDR.Fldigi is a computer program that runs in conjunction with a conventional HF SSB radio transceiver, and uses the PC sound card as the main means of input from the radio, and output to the radio. These are audio-frequency signals. The software also controls the radio by means of another connection, typically a serial port.