[Elecraft] Trying to get to grips with the KDSP2 Filter

[Don Wilhelm]

Ray,

Think about how you are going to operate with data modes, and how you 
have the RTTY filter set aligned (or will align it) - that will tell you 
how to set the KDSP2 RTTY parameters.
If you will always use the full SSB filter width passband when using 
digital modes, perhaps the RTTY filters that are set as default are OK 
for you.
My recommendation is that you set the RTTY IF filters to widths of OP1, 
1.00, 0.70, and 0.40.  Set the passband for the OP1 filter the same as 
you have for SSB, and center the passband for the more narrow filters at 
1000 Hz.
Then set the center frequency of the KDSP2 filters to 1000 Hz.

In use, tune the desired signal to the vicinity of 1000 Hz in the 
waterfall display so you can switch in the narrow IF filters and/or the 
DSP filters to reduce QRM.

Why choose 1000 Hz for the center (you might ask) - well, the K2 BFO has 
enough range to allow that frequency, but not much higher.  Also, MMTTY 
has a mark frequency setting of 910 Hz that works with that center 
frequency.

73,
Don W3FPR

On 1/4/2012 10:13 AM, Ray G3XLG wrote:
> Thanks Ken&  others who replied directly. I do have a copy of the KDSP2
> manual&  the KSB2 manual which are helpful and I now understand about "nr"
> on the CW filters.
> But I still cannot find any recomended DSP filter settings for Data modes
> like RTTY or PSK31.
> 73
> Ray, G3XLG
>
> -----
> Ray G3XLG
> --
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