[Elecraft] K3 noise reduction

[charles]

On Friday 20 June 2008 09:00:24 GW0ETF wrote:
> I'd recommend a read of Lyle's description of NR in the FAQ and also in
> 'Operating Tips'. From this it's clear this sort of adaptive filtering is
> going to be most effective for CW.
>
> I've been using it with F2-3 setting and it works fine for me (on CW). On
> signals other than very weak ones (which Lyle points out could be adversely
> affected by NR), the audio actually appears to increase a notch if
> anything. There is a small amount of distortion on the audio with the most
> noticeable being a softening of the cw characters which will make copying
> slightly more problematic in difficult conditions.
>
> Having said all that I still use filtering first and foremost before
> falling back on things like NR; and to comment on the suggestion that NR
> should remain on after switch off, I remember ages ago Eric or Wayne saying
> they specifically designed the NR *not* to remain on as folk were
> contacting them complaining their receiver had died when they switched
> their K3 back on and not hearing any background hiss - the NR is that good!
> Anyway it's only one button press to turn it back on...
>
> 73,  Stewart Rolfe, GW0ETF (K3/100 145)
I have read the FAQ on NR.
So I cannot understand why when I tap NR in CW mode I get the message N/A.

I used to be able to use NR in CW mode.

Charles - M0BIN