It is not actually a carrier but LO leakage from the commutator ic FST3253 and there is no adjustment you can make to null it on this implementation. I use sdr1k with the 100w PA and I have measured this leakage to be -20dbm @ 160m (70db below 100w)and 0dbm @ 10 m (50 db below 100w but only 30 db below 1w). While you transmit on ssb it is on your vfo frequency and at am/fm it is on vfo - if. You can also trace it during reception but with much lower level.
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