First cut the output from the computer by 1/3 to 1/2.  Now this will allow 
finer adjustment with the K3 controls. 

Sent from my iPhone
...nr4c. bill


> On Feb 2, 2020, at 7:24 PM, Bob McGraw K4TAX <[email protected]> wrote:
> 
> Go into the TX TEST mode and see if the issue still exist. If not, it’s an 
> RFI issue. If not, back the MIC (Line gain) down to zero and start up 
> watching the ALC  scale. The computer level may be overdriving the radio. If 
> so back the PWR slider on WSJT down. 
> 
> Bob, K4TAX
> 
> 
> Sent from my iPhone
> 
>> On Feb 2, 2020, at 6:13 PM, Lee Murrah via Elecraft 
>> <[email protected]> wrote:
>> 
>> I am running WSJT-X in FT8 mode on my K3S using the onboard sound card and 
>> USB cable and VOX for keying. My computer is a Mac running Catalina. The K3S 
>> manual recommends setting the drive at 4 or 5 bars to avoid distortion by 
>> the ALC.. When I use the audio output slider set the drive level, the 
>> display jumps from no bars to 6 bars, and vice versa, and nothing on 
>> between.  I have also tried using the MIC level and the POWER slider in FT8 
>> with the same results.  The software id decoding fine. Can anyon suggest 
>> what the problem might be?
>> 
>> KV5M
>> Lee
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