[Elecraft] K3 Audio Low Pass Filter

[Brett Howard]

Its a low pass filter starting around 3.8Khz or so.  I have some before
and after plots.  I just need to get around to posting them so I can put
them up on the reflector.

On Fri, 2009-07-03 at 19:45 -0400, Mike Harris wrote:
> G'day,
> 
> | All in all I'm quite pleased with the sound difference.
> |
> | ~Brett
> 
> OK, that's couple of positive comments.  Is there any technical data on 
> the characteristics of this filter.  For example, does it in any way 
> respond to the "pink" vs. "white" noise thread of a few weeks ago.
> 
> I've become rather more interested in this since reactivating my K2 and 
> running it side by side with the K3.  The K2 sounds so much nicer even in 
> the presence of a received S3 buzzy background noise.  If only the K2 
> power overshoot on 40M SSB didn't give my amp a hard time...
> 
> Now to put this in context, there was a huge improvement in the K2 as soon 
> as I installed the analogue af CW filter years ago.  In SSB mode the 
> filter just introduces a low pass filter which takes the hiss out of the 
> audio and made it really smooth to listen to.
> 
> I have played with the DSP bandwidth settings and replicated the K2 af 
> spectrum as displayed in Spectrogram to see if I can make them sound the 
> same but they don't.
> 
> My agc and equalizer settings are nothing unusual or extreme.
> 
> Regards,
> 
> Mike VP8NO
> K2 #1400
> K3 #345 
> 
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