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Radio Frequency Modems
http://www.roxie.org/papers/publishing/node50.html
Radio Frequency Modems. A modem (modulator/demodulator) is a device that transforms signals from one form to another. Modems are usually used over phone lines, but an RF (radio frequency) modem converts radio signals to other forms. In August 1991, CUE, a paging company, announced the CUE LapCom RF modem.
Lab6 Part A- Audio Frequency Shift Keying (AFSK)
https://inst.eecs.berkeley.edu/~ee123/sp15/lab/lab6/Lab6-Part-A-Audio-Frequency-Shift-Keying.html
Lab5_Part_2-Audio_Frequency_Shift_Keying(AFSK)
https://inst.eecs.berkeley.edu/~ee123/sp17/lab/lab5/Lab5_Part_2-Audio_Frequency_Shift_Keying(AFSK).html
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