[Elecraft] NR and Audio increase

[Wes Stewart]

I can almost guarantee this is going to be another one of those, "My radio doesn't act like that threads."

The reason being, this phenomenon is level sensitive.  With a weak signal the noise reduction lowers the signal strength but above a certain level, it increases the signal dramatically.

With a -110 dBm signal (1000 Hz beat note) turning on NR (F1-1) reduces the audio signal 6 dB.

At -100 dBm input, NR *increases* the signal 11 dB.  At -90 dBm it's up 16 dB.

Wes  N7WS


--- On Wed, 4/8/09, Merv Schweigert <k9fd at flex.com> wrote:

> From: Merv Schweigert <k9fd at flex.com>

> The post from BA4RF etc about the NR causing the audio to
> blast,
> 
> I mentioned I do not work SSB but tried went to SSB and
> confirmed
> the increase in audio, 
> well its on all modes as far as I can tell,  to be more
> truthfull I do 
> not use
> NR as I find it to non effective to CW work at least the
> for what I want,
> 
> If you have a decent signal strength CW signal tuned to the
> pitch setting
> and hit NR with a setting of 4 the audio increases
> dramatically,  I 
> tried it
> also listening to AM broad cast on 40 meters and had the
> same increase.
> 
> So unless its my radio only again the NR function is not
> working on all
> modes as of the last couple updates.  AGC updates effected
> the NR
> in some fashion?  I did not try changing any of the AGC
> settings to see
> if they made any difference. 
> 73 Merv KH7C