[Elecraft] Adjusting Audio Level for Digital Modes

[Wes Stewart]

My testing with WSJT-X (FT8) "tune" for an audio tone, says that any ALC 
indication at all, no matter where it is, gives exactly the same RF output.  
That said, _and this may only apply to my situation, _the signal is cleaner with 
only three bars lit. I'm seeing 52 Hz spurs at -50 dBc for anything above 
three.  This is with a K3 operating at 5W into a dummy load.

Maybe someone else with a spectrum analyzer can take a look at this.

Wes  N7WS


On 9/8/2017 3:59 PM, Don Wilhelm wrote:
> Bret,
>
> You likely have the LINE IN level in the K3/K3S set to either the high or low 
> end of the range.  Set it first for midrange (about 30), and then set the 
> soundcard "speaker" output slider for about 50%, and set the WSJT-X slider 
> also to about 50%.  Then see what the ALC meter reads during a transmit.
> You should be able to do that in TX TEST mode, or working into a dummy load so 
> there is no need to put those "testing" signals on the air.
>
> With the K3 LINE IN set to midrange, adjust the computer sliders so you get 
> close to the 4 bars with 5th bar flashing.  Then fine tune that with the K3 
> LINE IN to get to the right level.
>
> If you cannot obtain the 5th bar flashing, settle for 4 bars solid with the 
> 5th bar not illuminated at all.
>
> Don W3FPR