Multiscan 2SL and MultisScan 3B both work effectively on the G8PHM iMac, and successfully connect to my Yaesu FT897 via a Signalink USB integrated sound card, with an xchipi-X RS232-USB adaptor from CPCFarnell. The antenna is an offset dipole, the band is 20m. I was using 25 watts of power.

A successful QSO with IK2QIN resulted in this marvellous picture in return.