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more modem design decisions

 - modulation or not?

  some modulation is necessary since i can't transfer DC. but
  frequency response looks really non-flat to go for a wideband
  approach. i need to experiment.

 - FIR or IIR

  what is needed is a decimating filter. i can probably get much
  further with a crude windowed FIR than an IIR.




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