[Elecraft] k3 NR Audio level increase

[Don Wilhelm]

Joe,

I tried your suggested settings, and yes I found an increase in audio 
volume.  I also observed that the NR worked as a squelch at that 
aggressive setting.   I normally use F1-3 or F1-4 for NR and have no 
problem.

I don't use NR when attempting to copy a weak signal.  When the weak 
signal is down in the noise level, the NR algorithm cannot distinguish 
between the noise and the signal with certainty.  My ears do a better 
job despite the noise, so I turn NR off when digging for the weak ones.

73,
Don W3FPR

Joe Planisky wrote:
> Don,
>
> Try this:
>
> 1. Set mode to CW, BW to 2.00, RX EQ = flat.
>
> 2. With no signal tuned in, hold NR and set to F4-4. Tap NR twice to  
> turn off NR.
>
> 3. Tune in an S9 signal, or better yet, use a signal generator (I use  
> an XG2).
>
> 4. Set RF gain to max, AF gain for a comfortable volume.
>
> 5. Tap NR to turn on noise reduction. (You might want to keep one hand  
> on the AF gain control :-)
>
> On my K3 (with FW 3.11), turning on NR under these conditions boosts  
> the audio output voltage by 17.2 dB according to the built-in AFV meter.
>
> Using less aggressive NR parameters results in less of a boost, down  
> to 6.3 dB at F1-1.
>
> Now tune in a weak signal (say, S3) and repeat the steps.  The boost  
> is still there, but very much reduced (On my rig at S3 and NR=F4-4,  
> the boost is 6.3 dB, at NR=F1-1 it's 1.4 dB)
>
> Now imagine trying to copy a signal that rapidly fades between S3 and  
> S9 with NR on.
>
> 73
> --
> Joe KB8AP
>   
>