I fully agree with Jim, K9YC on the point of distortion. In fact there
are two signal paths in which distortion will affect ones results.
Certainly audio distortion on the TX side will affect the quality of
ones transmitted signal and distortion on the receive will affect ones
decode quality.
In my Windows 10 environment I find the Speaker level {USB Audio CODEC}
best at about 50% or - 10 dB. Also in this pane, be sure to disable
all enhancements. This allows the PWR fader for WSJT-X to operate
about 50% or mid range of its travel. The Line gain on the K3S runs
about 25 for 4 bars solid on the ALC and the 5th bar flickering in Data
A mode. Adjust actual RF power output via the PWR control on the radio.
On the receive end of WSJT-X, I find the Recording device level to be
optimized for the USB CODEC at 0 dB with the K3S line out level at the
normal / default of 010. Excessive USB CODAC gain at this point can
over drive the audio stage causing distortion and one will sacrifice
decode quality. The WSJT-X digital gain runs about the 3rd to 4th bar
from the bottom and the level indicator nominally at about 25 dB to 35
dB depending on band noise and signals.
Should you find any of your controls at an extreme position, I would be
concerned that something is not correct up or down stream in the audo paths.
73
Bob, K4TAX
On 7/4/2017 7:33 PM, Jim Brown wrote:
On 7/4/2017 3:43 PM, Richard Lamont wrote:
That's receive levels. I was talking about Tx distortion.
The distortion I measured was for TX mode -- sound interface to radio.
Richard -- I'm a Fellow of the Audio Engineering Society, BSEE,
retired, worked in both audio and broadcasting. I'm VERY aware of
distortion products and the mechanisms that produce them. I also
TAUGHT this stuff. Your concerns are overblown.
FWIW, I am FAR more concerned with distortions produced in ham gear at
RF.
73, Jim K9YC
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