开云体育

Hi All,

When running WSJTX in FT8 mode on ubitx 40 meters:

I am seeing some "wavy gravy" audio artifacts that do not seem to be
related to the SI5351 frequency stability. See the attached waterfall picture ub2cw.png

The "wavy gravy" ("WG" herein) appears not to be the fault of the SI5351. I say that
because the red line at about 1600 is a stable CW signal I injected for reference. As
you can see, the CW signal is steady; therefore, the SI5351 is steady. But the WG is not.

For completeness, I am using KD8CEC 1.04 software, although I do not believe it is
software related.

It is possible that a harmonic of a signal from the Arduino Nano is beating with a harmonic of
the steady BFO. However, the WG signal spacing is a mystery.

Has anyone else seen such artifacts on a waterfall?

For reference purposes, attached is a waterfall picture from a commercial rig, a Yaesu FT-840.

Ideas?

Regards,

Rod KM6SN