if I open WSJT-X, transmit on several (two? three? or more) different bands in succession, eventually this will happen:
Just over two seconds into the transmission on the latest band, the frequency display in the main WSJT-X window changes from the correct transmit frequency on the latest band to a frequency used on one of the earlier bands. (For example, if transmitting on 28.074 MHz, after two seconds the displayed frequency may change to 3.573 MHz.) At the end of the transmission, the display changes from the incorrect transmit frequency back to the correct receive frequency. Once it starts, it will do this consistently on every transmit cycle on the latest band. The problem is not band-specific; it's happened on most HF bands. The band-selector pull-down follows the frequency display; that is, it is correct at the beginning of the Tx cycle, changes to the same (incorrect) band as the frequency display after two seconds, then changes back to the correct band at the end of the Tx cycle. As an experiment, I tried transmitting with zero RF output and the problem still occurs, so it doesn't seem to be an RF-related issue. The actual rig transmit frequency remains on the correct frequency (on the latest band) throughout; the rig VCOs do not change bands. QSOs seem to be unaffected. The usual df-driven Tx frequency offsets occur normally. Operating on Win10 with an IC-7610 with the Split Operation setting set to "Rig." Ed Callaway N4II
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