[K3] [Elecraft] FSK Help

[Jim Brown]

On Tue, 22 Jul 2008 10:49:27 -0400, Jerry Flanders wrote:

>Shifting a constant carrier back and forth does not require linearity 
>in later stages - for the same reason that CW does not.

Hmmm. Well, yes and no. Shifting a carrier in frequency results in 
switching transients (clicks). If these are amplified non-linearly, their 
relative level can increase. These clicks are easily heard in a K3 when 
close to a relatively strong RTTY signal, even one coming from another 
K3. 

The comment that FSK avoids the audio distortion produced by a sound card 
is quite correct. However -- sound card distortion can often be reduced 
significantly by operating the sound card about 6 dB down from its max 
output. 

73,

Jim K9YC