[Elecraft] KDSP2 Audio Filters

[KC9QQ]

I recently constructed and installed the KDSP2 in my K2.  I installed it
after I had installed and aligned the KSB2 using Spectrogram.  I notice that
the KDSP2 seems to work wonderful in CW, but when I am listening to SSB
signals the audio sounds as if it is passing through a tin can. 

I saw in another post a discussion on adjusting the AF1..AF4 in addition to
the FL1..FL4.  Is this done using CAL FIL or must this be done within the
KDSP2 menus settings?

I saw the following post on adjusting the KDSP2 audio filters, but the
process to use is not obvious to me:

/You do it just the way you would without the DSP unit. 
First select the pitch you want to have at the center of the filter. 
I use about 550 Hz here. 
Then adjust the KDSP2 for the narrowest setting you want to use, 
say 100 Hz, centered on the pitch you have selected.  Now do 
the adjustments to the crystal filter at its narrowest bandwidth 
until you see the most even symmetrical passband curve. 

Now step the DSP unit to the next wider bandwidth you want, and do 
the same for the crystal filter.  Again adjust the crystal filter 
for the best looking curve at that bandwidth.  Keep doing this up 
to the widest bandwidth of the crystal and DSP filters.  For 
convenience I use the same bandwidth in both filters at a given 
selection setting--XF1=AF1, XF2=AF2, etc. 

Good luck and 73 
Bob N6WG 
The Little Station with Attitude 
/

Thanks,

Fred, KC9QQ



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