[Elecraft] K2 headphone audio for sound card PSK31?

[Henrik Tuxen]

Hallo Cathy,
for what it is worth I build a small audio interface from PSK31 based on
the ideas from Don, W3FPR. You can find the result on
www.qslnet.de/dk1htx.

My ambition was to fit the thing inside the K2/100 without taking up
space required for options. I have to admit that it did cost me one or
two evenings before I finally got it right.

Vy 73 Henrik, DK1HTX

On Tue, 2006-11-14 at 22:16 -0600, Cathy James wrote:
> I ran some tests this evening with my K2 and my computer sound card and 
> HamScope software.  80 meters was not great, but it was open and there 
> were a number of QSOs going on.
> 
> The K2 was able to pick up signals and decode them quite well, and the 
> narrow filters really help block QRM.  (My RTTY filter bandpasses are 
> all over the place, though; I don't think I ever finished setting them 
> up after getting Spectrogram going.  Have to revisit that!)
> 
> However, the audio drive from the K2 is much less than from the DX-70TH 
> that I use as my primary digital mode rig.  Although the signals decoded 
> well, the traces on the waterfall barely showed even at fairly high 
> soundcard record volume settings.  With the DX-70TH plugged into the 
> sound card instead, the same signals were brilliant yellow and easily 
> found by eye.
> 
> What can I do to increase the audio output level of the K2 for sound 
> card purposes?
> 
> Cathy
> N5WVR
> 
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