[Elecraft] K3 AFSK RTTY overdrive - no ALC

[K8TB]

One other thought. Are you using the line out to drive your soundcard? 
And if so, is your monitor level turned up on the K3? And if so, is 
anything in your computer, digital mode software, allowing the incoming 
sound card audio to be mixed with the outbound audio? Each software 
package and audio card combo is different. There is the possibility that 
your setup is looping audio back to the K3. If this is happening, it 
would be hard to figure out where the feedback frequency is, and that 
could be tripping the K3 audio limiters.

    Pull the line out cable on the K3 while you have the problem, and 
see if it disappears.

    tom bosscher k8tb