[Elecraft] KDSP2 question

[Robert Tellefsen]

Hi Stan
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

-----Original Message-----
From: Stan Rife [mailto:srife at swbell.net]
Sent: Wednesday, October 12, 2005 9:56 AM
To: 'Robert Tellefsen'; 'Ken Bessler'; 'Elecraft Main Group'
Subject: RE: [Elecraft] KDSP2 question


	Best looking curve??  Can you elaborate Bob? It has been a while
since I set mine up and I have adjusted the sidetone somewhat to peak the
sidetone to my hearing. I need to go in and make sure the sidetone is still
in the center of the passband on the filters. I have never used Spectrogram
to adjust my DSP filters.

Stan Rife
W5EWA
Houston, TX
K2 S/N 4216


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Robert Tellefsen
Sent: Wednesday, October 12, 2005 11:32 AM
To: Ken Bessler; Elecraft Main Group
Subject: RE: [Elecraft] KDSP2 question


This is normal, Ken.
A good DSP filter has exactly the characteristics you describe.

When I use Spectrogram to adjust my crystal filters, I first set the
DSP to the desired bandwidth, then the XFIL, then do the adjustment
until I get the best looking curve.

Good luck and 73
Bob N6WG
The Little Station with Attitude

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Ken Bessler
Sent: Wednesday, October 12, 2005 9:04 AM
To: Elecraft Main Group
Subject: [Elecraft] KDSP2 question


Is it normal that (according to Spectrogram) my new KDSP2's filters have
sharper skirts and far less ripple than the XFIL filters?   I'm not talking
about the denoiser or the autonotch, just the bandpass filters.   Is the
KDSP2 that good or are my X filters defective? Also, I'd like to hear from
other KDSP2 owners as to what they have "nr" and "nt" set to. I have these
values and they seem to work:   nr 30 50 nt 50 00   Comments welcome....
73 de Ken KGØWX - Flying Pigs #-1055 Elecraft K2 #4913 - Kadiddlehoppers
#11,807
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