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 On Saturday, February 13, 2021, 01:34:53 AM CST, Reino Talarmo <reino.tala...@kolumbus.fi> 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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