Hi Mike,
two things to check.
1) make sure that either volume controls are disabled in the VAC control
panel, or that the master level for the VAC device you are using is set
no higher than 0 dB.
2) record the Tx audio coming out of the VAC device with Audacity or
similar and check the waveform using Audacity's analysis tools.
73
Bill
G4WJS.
On 13/02/2021 13:57, Black Michael via wsjt-devel wrote:
I'll add one more data point. Looking at the same signal in FLDigi I
don't see any problem...nice and clean at 0dB attenuation.
Only problem is in WSJT-X and JTDX.
Mike W9MDB
On Saturday, February 13, 2021, 07:53:25 AM CST, Black Michael
<mdblac...@yahoo.com> wrote:
If you have a virtual audio cable you can do the same test.
This has nothing to do with the rig -- it's either Virtual Audio Cable
(which I doubt) or the Qt sound process. I've seen similar behavior
from the Qt sound device before.
I can run this test with the rig turned off and get the same result.
It's not quite the 16th bit as -0.4dB is not half scale.
And adjusting the signal level in the sound control panel has no
effect. The signal in Audacity looks clean.../whjich makes me think
it's Qt causing this problem.
Mike W9MDB
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