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If I use QPSK modulator/demodulator is it possible to transfer digital data over ham radio frequencies. SSB-QPSK transmitter

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  • $\begingroup$ Do you want to do qpsk or ssb-qpsk? Two different schemes. See the Nokia patent on ssb-qpsk. $\endgroup$
    – Marcus Müller
    Commented Jan 19, 2023 at 5:47
  • $\begingroup$ And psl31's qpsk mode is a bit different, too. $\endgroup$
    – Marcus Müller
    Commented Jan 19, 2023 at 5:53

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Yes, it's possible.

The physics and the math don't care what the legal assignment of some RF band is - so you can do any working modulation method on a ham band. Nothing is special about ham bands.

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