But it's showing up on transmit too....at a different level.
At -0.2 and below it's OK. It's way down but if everybody is doing this on the
band it will add to all the noise.
At -0.1 problems.
It looks like it's clipping the bottom of the sine wave
On Saturday, February 13, 2021, 08:40:23 AM CST, Bill Somerville
<g4...@classdesign.com> wrote:
Hi Mike,
that could be a minor rounding error in one of the filters in WSJT-X, not
sure there's anything to worry about as any input signal that is that close to
0dB is bound to clip at some point anyway, i.e. input levels should not be
anywhere near that high.
73
Bill
G4WJS.
On 13/02/2021 14:23, Black Michael via wsjt-devel wrote:
This is with 2.4.0-rc1 by the way...
Audacity shows a perfectly clean signal....as does FLDigi. Only WSJT-X and
JTDX show problems with the signal. Common factor is Qt sound input.
Mike
On Saturday, February 13, 2021, 08:13:45 AM CST, Bill Somerville
<g4...@classdesign.com> wrote:
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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