Set the BFO to 11.9965 and see if that works.
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At 29-10-18, you wrote:
After relay change my uBitx 4.3 is now capable for legal CW QSOs. So I did the next step and changed L5,L7 and L1 to 680 / 330 nH.
The first test on SSB via dummyload and 20db extra attenuation direct in the antenna of my good old SDR-IQ shows a rather clean signal in the RF spectrum at 10kHz width - but looking like AM and not like LSB on 3.6 MHz. Test with other stations confirmed that. The carrier is still present and the USB sideband is only 6dB down compared with LSB.
Surely the BFO must be corrected. But how? I followed the instructions, got a AM station with known frequency and set BFO to zero beat. Was then happy, to have a clean reception of all SSB stations on the QRGs where they were spotted.
73 Matthias, DD7NT
Raj vu2zap