I used Spectrum Lab to examine my TS-590S TX monitor audio for WSJT-X versions 1.9.1, 2.00, 2.2.1, and 2.3.0. All versions exhibit audio harmonics but each is about 40dB below the wanted modulation.
There is a very noticeable difference in the primary modulation signal between WSJT-X versions. 1.9.1 and 2.0.0 show wide modulation with characteristics similar to key clicks at each tone change. Versions 2.2.1 and 2.3.0 show a softer change between tones with no "clicks". Andy, k3wyc
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