[Elecraft] K3 - Filter suggestions for new builder

[Don Wilhelm]

Ed,

I would think you are hearing the results of a narrow passband rather 
than DSP audio distortion.
I say that because in all cases with the K3, it is the DSP that 
determines the filter width rather than the roofing filter.  What I am 
saying is that even if you put in a 1.8k filter, SSB at a 1.8k width 
will sound the same as it does right now using only the DSP.

I trust you are using the HI-Cut to narrow the receive passband, leaving 
the LO-Cut set to the 200 to 300 Hz range rather than trying to use the 
Width and Shift controls.  If you are using Shift and Width, you have to 
re-position Shift with every change in Width or the speech will become 
more distorted.
Using HI-Cut, you just reduce the high frequency end - no other change 
is required.

73,
Don W3FPR

On 9/26/2012 1:35 PM, Edward R Cole wrote:
> I have thought of adding a 1.8 or 2.1 KHz filter for working tough
> SSB signals.  I do try running the DSP down to that bandwidth but
> find that the DSP audio distortion sometimes is counterproductive to
> hearing weak SSB.  I do not have trouble with dense local QRM up here
> in Alaska.  I wonder if the roofing filters are easier to listen thru
> than the DSP filter?
>