John I has been a while since I used a loop and keyed a tube trqnsmitter, but here is whaqt I remember. VFO keyers in typical CW/AM rigs are single band devices since the shift multiplies as the VFO output multiples to the next up band. Since the keyer is adding (or subtracting) capacitnce to the VFO circuit , any change if VFO frequency will also change the shift frequency.
I am not a fan of AFSK. But if you can generate a carrier with the SSB adapter, think about keying the BFO in that section. Then a single keyer will give you shift over the entire range, and side band selection will give you the choice of mark/space signalling. Byron, W3WKR
