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
<[email protected]> 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
On Saturday, February 13, 2021, 01:34:53 AM CST, Reino Talarmo
<[email protected]> wrote:
Hi Mike,
It seems that you TX is very sensitive to a small overdrive! Which is rig you
are using and how you have set it at 0 dB level? It looks like a digital
processing goes wild due to a misunderstood sign bit or something similar that
generates a huge step in analog value due to misbehaving digital value that
goes to analog conversion.
73, Reino OH3mA
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