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Sound Card Digital Modes
Even a basic SB16 can transmit/receive a very large bandwidth
Modern computers and DSPs provide incredible signal processing power
Radio usually needs an additional PTT signal to key up the transmitter
Interfaces vary from sub-$10 homebrews to >$200 USB behemoths.
Even a decade ago, many digital modes required dedicated DSP boxes.
PTT = push to talk, the switch on the microphone.