The 8620C Sweep Oscillator Mainframe is a versatile mainframe which uses the popular 86200 Series plug-ins (sold separately) to provide capabilities required in a wide range of applications. With appropriate plug-ins, testing digital and analog microwave radio systems and components is easy and affordable. Up to four separate bands and their frequency scales can be selected with a band select lever. Modulation is possible utilizing the internal AM 1 kHz or external FM, based on the RF unit. The 8620C supplies three markers and offers sweep functions, features full Sweep, Marker Sweep, CW / Delta F, and CW sweep modes include Auto, Line, and External. The 8620C also includes inputs for band selection, sweep function selection, and analog frequency control. Plug-ins sold separately. Sweep modes are Auto, Line & External. Modulation is internal AM 1 kHz & external FM based on RF unit.