[Elecraft] Kdsp2 problem

[Robert Johansen]

Hi Don,

The problem that I am experiencing is that when I completed the DSP board
last night, I noticed that the default setting of the SSB DSP filter 1
(low pass filter) did not sound like its high frequency audio bandwidth
was wide enough. The filter setting 2 default setting of 2.5 KHz  had a
higher frequency of noise content.
 
When I  tried to change the upper cut off frequency following the
instuctions on page 26, I noticed that any setting greater than 2.5
through LPF resulted in a narrower noise bandwidth although the display
changes normally according to the instructions.
 
I have experimented with it further today and am experiencing the same
problem. Also I have noticed that when I advance the low pass filter
cutoff  from display  S1  00  2.5   to  S1  .45   2.5  it sounds like I
have selected a CW filter from the change in the noise bandwidth.  S1 
.40   2.5  sounds like the correct bandwidth. It is strange that the low
frequency cutoff  filter characteristics change very abruptly over 400
Hz.