[Elecraft] Regarding PSK31 and K2 Filters and KDSP2

[Lyle Johnson]

Hello Joe!

> ...And for Lyle, I have found that using the KDSP2
> in USB mode to defeat the prohibition on using
> de-noising on digital modes, allowed me to experiment
> with de-noising. I found significant advantages
> when NR is on during strong QRN. It does not appear
> to cause enough phase shift to prevent solid copy
> especially when QRN is so bad you couldn't copy anyway.
> Even the notch filter removed a nasty heterodyne and
> did not remove a PSK signal.

Thank you for doing this testing.  Seems like you've tried the most common
HF data modes successfully.

> I recommend that future releases of DSP firmware allow NR
> and NF on RTTY modes.

I will carefully consider this.  My primary reason for leaving nr and nt
unavailable in data modes was to minimze the burden on product support.

> There is no need to protect us from ourselves!

Buckle up :-)

-Lyle KK7P, for the Fraternal Order of Silicon Cops