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Frequency Shift Keying - A digital transmission technique in which a "1" is represented by one frequency and a "0" by another. It is the digital equivalent of FM.
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FSK Modulation using I/Q
Yes. Set your local oscillator halfway between f1 and f2 i.e. (f1+f2)/2. As your I/Q data, make a sine/cosine wave (i.e. a complex sine wave i.e. a point going around in a circle) with a frequency of …