Mike,
the "nastiness" you refer to is more than 65 dB down. As far as we have
been able to determine it is due to either Windows or VAC. My money is
on Windows since VB Cable exhibits the same behaviour, although that is
not conclusive. Note that 65 dB down is below the distortion added by
almost all transmitters. We are pretty certain Qt is not the cause since
when the Pwr slider is at 0dB Qt does nothing with the samples other
than copy them to the Windows MME audio buffers.
73
Bill
G4WJS.
On 15/02/2021 13:23, Black Michael via wsjt-devel wrote:
It's not just the waterfall....that nastiness gets transmitted too.
Mike W9MDB
On Monday, February 15, 2021, 02:53:44 AM CST, Reino Talarmo
<reino.tala...@kolumbus.fi> wrote:
Hi Mike and Bill,
I looked those *.wav files using v2.4.0-rc1 and noted interesting
presentation difference, when I had Flatten activated or
non-activated. Especially the waterfall display changed a lot. It was
difficult to see those multiple sidebands in non-flatten display
totally independent of gain and zero settings. In spectrum display I
can see the carrier and weak sidebands at 310 Hz or so. In both
flattened and non-flattened spectrum other than the 310 Hz sidebands
are really weak some are just a pixel or two and others none.
Could the flattening do more than modify the frequency amplitude and
be an additional reason for a bad waterfall display?
73, Reino OH3mA
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