[Elecraft] Power too high in PSK31 / S

[Jim Brown]

On Sat, 4 Oct 2008 16:20:33 -0400, Richard Ferch wrote:

>If I set the K3's requested power to 100 watts, then with 0 bars ALC I get
>IMD well below -30 dB, but with even 1 bar it rises to -26 dB, 

ALSO -- don't ignore the setting of the computer sound card when using 
computer-generated PSK or AFSK. Tests on sound cards in my IBM Thinkpads show 
that the percent distortion drops by 10 dB if I run the sound card level 6 dB 
below clip rather than only a dB or so below clip. Obviously, all sound cards 
are not created equal, so check your own sound card. 

The "details" of what I'm suggesting here is nothing more than turning down 
the sound card a bit and turning up the Line In gain of the K3 to get the 
needed level to drive the K3. 

73,

Jim Brown K9YC