[TenTec] Questions about NR i.e. Orion

[OE3ZK Gerhard]

Hi!

I observe many specialists on this reflector so that I cannot hesitate to ask a few WHY questions about DSP noise reduction.

Why " with weak signals it is harder for the DSP NR to determine what is noise and what is signal "?  

Why does a broader band of noise make the DSP  NR more effective ? Will a roofing filter reduce the effectiveness of DSP  noise reduction, do wideband I-Q signals improve it?

Why shouldn't we use a different NR techniques for different modes?

73
de Gert, OE3ZK