I wrote:
> NR effectiveness? Measure MDS (Minimum Discernable
> Signal) with DSP BW = 100 Hz and NR Off. Then
> switch NR On and measure it again.
Sinisa replied:
>MDS, S/N and similar measurements with NR on
must be performed completely with the signal present,
and not by switching the signal on and off.
I agree. I meant with the signal
always present and DSP BW always = 100 Hz,
but with the two cases of NR On and NR Off.
Of course this could result in an impractical
reading if NR reduces the BW beyond what a
CW signal's normal BW is. The narrowest BW
will always win a MDS test but it may not be
practical for copying real-world CW signals
that have bandwidths wider than a carrier.
It would be interesting to know if the NR
algorithm limits the lower bandwidth to a
"real world" practical value (such as 50 Hz).
73, Bill W4ZV
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