[hpsdr] QSD roofing filter

[FRANCIS CARCIA]

The flex 5000 FAQ claims the QSD acts like a 400 KHz roofing filter. It makes me wonder if that could be improved or is improved using an integrator. 400 KHz is like missing a wall on your house and winter is coming. I wonder if it is worth adding some active filtering. 
  frank wa1gfz
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