[Elecraft] K3 new V3.25 NR not so good for CW week signal

[Brett Howard]

Not saying I'd do it.  (and I'm not with the 8 filters I have in my
radio) but one can if thats what they wish to do.

~Brett

On Sat, 2009-08-15 at 12:42 -1000, Merv Schweigert wrote:
> Not really,  if you read the recommendations for the filters you will
> notice 
> that caution is warranted for setting the gain higher than
> recommended, 
> for IMD prevention if I remember correct.   Kind of like the Inrad
> roofing
> filters,  in some cases the gain is set to high and causes more IMD
> than
> without the filter. 
> Some Inrad roofers for the FT-1000D had too much gain and the radio
> was worse with them installed than without.  W8JI had some
> measurements
> on those issues.  
> Merv KH7C
> > This is sorta already there if you have multiple roofing filters.  You
> > can define the gain that is added when each filter kicks in.
> > 
> > 
> > On Sat, 2009-08-15 at 13:50 -0600, William Carver wrote:
> >   
> > > I've noticed in homebrew receivers as the bandwidth narrowed, shedding
> > > noise and QRM I preferred the gain to go up, increaseing the in-passband
> > > signal amplitude. I always attributed it to formative years with a
> > > Heathkit Q multiplier. It may be an effect similar to AGC with
> > > adjustable flatness (May 1996 analog circuit, in DSP of K3). I found I
> > > preferred to have strong signals sound louder rather than perfectly
> > > flat. Prolly a psycho-acoustic explanation (or maybe just get my head
> > > examined?).
> > > 
> > > In firmware one could increase the audio gain by an adjustable amount as
> > > the IF bandwidth was decreased, with an operator-settable scaling
> > > number. Say 0 = gain independent of bandwidth, to 100 = gain multiplied
> > > by K * (2800/DSP bandwidth). Very similar to the AGC rise scaling. That
> > > sounds good to me.
> > > 
> > > 
> > > 
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