[Elecraft] DSP Unit and PSK31 and other digital modes

Thu Apr 8 06:03:01 2004

Bob:

Thanks very much and this manual answers all the questions I had.
Lyle sent me a note earlier pointing to it.

This has the filters you want, the variable bandpass filters
and mode selectable-user defined.  AWESOME.

My kit was shipped today and I have to go away for a week.
Drat!  By the time I get back, I will have dog-earred the
web site reading the pdf files!

I like the suggestion of the gentleman (sorry, its six in
the morning after an all nighter at work) of turning the
AF up and the RF down.  I will try that after mine gets
built.

Bob
N4HY

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Bob Nielsen
Sent: Wednesday, April 07, 2004 4:51 PM
To: Elecraft Mailing List
Subject: Re: [Elecraft] DSP Unit and PSK31 and other digital modes

On Wed, Apr 07, 2004 at 01:11:14PM -0000, Robert McGwier wrote:
> It would be inappropriate to use the LMS noise canceling in the
> filters, but the KDSP2 page seems to imply this.  Unfortunately,
> the KDSP2 pdf file for the manual is no longer available for
> download on that page.  If you can dial in a narrowband FIR filter
> (bandpass) with the DSP unit, this will not likely hurt PSK31 and will
> 

Bob, 

I just checked the Elecraft web site and the KDSP2 manual is still
there <http://www.elecraft.com/manuals/KDSP2_A1.pdf>.  The only
adaptive filters provided are for the autonotch and denoiser functions;
FIR filters are used for the bandpass filtering.  Lyle included a brief
discussion of DSP filtering as part of the manual.

73, Bob N7XY
K2 #3273, KDSP2 Field Tester

-- 
Bob Nielsen, N7XY                          n7xy (at) n7xy.net
Bainbridge Island, WA                      http://www.n7xy.net