Mike,
here's a spectrum plot of that .WAV file selected from just after the
start of the main signal up to just before the end of the main signal. I
have zoomed in as far as Audacity allows on the minimum amplitude bottom
of the spectrum. It looks perfectly clean to me!
73
Bill
G4WJS.
On 14/02/2021 21:01, Black Michael via wsjt-devel wrote:
Link to wav
https://www.dropbox.com/s/cex6bfqfqzan65j/clipping.wav?dl=0
<https://www.dropbox.com/s/cex6bfqfqzan65j/clipping.wav?dl=0>
You should be able to duplicate this problem...
What I notice looking at this plot is the bottom side of the sine wave
has more points close to the edge then the upper side.
Inline image
Mike W9MDB
On Sunday, February 14, 2021, 01:00:15 PM CST, Bill Somerville
<g4...@classdesign.com> wrote:
Hi Mike,
OK, let's reset here. Which mode are you seeing this with? Please use
Audacity to record a 16-bit 48,000 Hz .WAV file being generated by
WSJT-X using VAC. Also check VAC is using 48,000 16-bit as well. Make
sure you have the latest version of VAC (4.65.0). We can start by
analysing the .WAV file for problems.
73
Bill
G4WJS.
On 14/02/2021 18:45, Black Michael via wsjt-devel wrote:
Sorry to confuse....
The receive was showing the effect of the bad Tx signal that has
artifacts.
I did another test on Tx to show you it's occurring there.
It's the Tx being clipped....JTDX does something like 95% or 90% of
max value and does not have the problem.
BTW...the windows playback level does affect it on the
7300...dropping below 0dB cleans it up.
On my system the playback level doesn't affect the behavior so
perhaps the VAC is contributing too. 0dB doesn't mean 0dB?
Mike W9MDB
On Sunday, February 14, 2021, 12:32:49 PM CST, Bill Somerville
<g4...@classdesign.com> <mailto:g4...@classdesign.com> wrote:
On 14/02/2021 18:22, Black Michael via wsjt-devel wrote:
I just confirmed this same problem on an IC-7300 via the USB audio.
You can see the hash noise on the waterfall.
Seems we need to reduce the maximum amplitude WSJT-X generates.
Adjusting the Windows playback level does not affect the behavior.
Mike W9MDB
Mike,
two messages ago you were confirming you had an issue with Rx audio,
now you are saying Tx levels need to change. Which is it?
73
Bill
G4WJS.
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