Also there with no transmitter involved. 2nd copy of WSJT-X listening to the
1st WSJT_X transmit audio device.
But seems nobody cares about getting rid of unnecessary noise (albeit minimal
it's still noise).
On Tuesday, February 16, 2021, 02:25:25 PM CST, Jim Brown
<k...@audiosystemsgroup.com> wrote:
On 2/16/2021 5:56 AM, Black Michael via wsjt-devel wrote:
> You're wrong -- it's being transmitted too.
> I send that example a while ago.
That doesn't mean it's necessarily coming from the code -- the
distortion could be generated anywhere in the analog chain, from the
analog side of the D/A of the computer, through the rig's audio stages,
the transmitter's RF stages, a power amp if there is one, the receiver's
RF chain and audio stages, to the audio side of the computer's A/D.
The audio side of computers are notoriously lousy. Years ago, I measured
distortion on the output of a "good" computer sound card as -30 dB just
below clip, and -40 dB at 6 dB below clip.
73, Jim K9YC
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