K3: DSP NR for Data A mode?

Posted by Bill Frantz on Jul 20, 2012; 4:03pm
URL: http://elecraft.85.s1.nabble.com/K3-DSP-NR-for-Data-A-mode-tp7559524.html

Is it possible to implement Noise Reduction in the DSP for Data
A mode? Or is it a really stupid idea?

The PSK software I use -- cocoaModem for the Mac -- has a noise
reduction mode which works reasonably well when it is receiving
a broad spectrum signal -- 2 KHz or more. It does not work well
at all when I narrow the DSP bandwidth to eliminate strong
nearby signals. This situation leads to the annoying situation
where I can copy a weak station when the bandwidth is broad, but
not when I have narrowed it to eliminate strong nearby stations.
The strong nearby stations overload my SignaLink AtoD converter
which keeps me from copying the station. It seems to me the DSP
is in a position to apply noise reduction before the narrow band
filter, if that is the best way to perform noise reduction.

Cheers - Bill, AE6JV

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