Since I've duplicated this problem on two computers with two different rigs and
two different audio chains (one USB and one VAC) this is fairly obvious a
WSJT-X problem.
Anything that adds noise to the bands is undesirable. Especially when it can
be cured by a small software change.
Mike W9MDB
On Sunday, February 14, 2021, 04:06:57 PM CST, Andy Durbin
<[email protected]> wrote:
"Do you still see harmonics if you drop WSJT_X Pwr level to -0.4 or so?"
I ran two tests with 2.4.0-rc1. One with Pwr at 0 dB and one with Pwr at about
-1.4 dB. The 0 dB test was extra. All other versions were tested with approx
-1.4 dB setting. (Why can't I read the setting by mousing over it? I have to
change it to read it).
There is no significant difference in the relative levels of fundamental and
harmonics for the two different Pwr settings.
In case it matters - Win 8.1 64 bit, TS-590S TX Moni feedback involves two
passes through a PCM2903B which itself contributes some spurii. The PCM2903B
spurii are fixed frequencies and are easily distinguished from the WSJT-X
harmonics.
With the exception of the change in characteristics at each tone change, I see
no difference between the versions reported. I don't consider harmonics 40 dB
below fundamental to a cause for concern. Audio clipping produces harmonics at
much higher levels.
Andy, k3wyc
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