Based on the Argo 515 manual...........in the SSB normal (N) position, one should experience USB on 20,15, and 10..........and LSB on 80 and 40. I suspect the SSB generator area may need some checking. A DVM and freq counter should get it done. In the early days, TT provided ample alignment info in their manuals. The 515 manual does. 73 John W4II