CPFSKContinuous Phase Frequency Shift Keying
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Therefore, this interpretation is for serial generation of MSK as CPM and is equivalent to the serial interpretation using CPFSK, which can be written as
This method provides a CPFSK modulated output signal at 1/N-times the output frequency with a modulation index of 0.
Both VHF (116 to 150 MHz) and UHF (225 to 400 MHz) operation are provided; modulation includes AM, FM and CPFSK.