Bob, I have an AL-1200 which works good with my MkV, and with the QSK-5 it works good in QSK mode. 73, Bill N6WS Bob Martin wrote: >I assume since the FT-2100 amp is a non QSK amp and is compatible with the >Mark V. that a AL-1200 or 1500 would also be compatible with the Mark V. > > > > >