The signal mode transmitted by satellite is different. The medium 6 transmits the C-band frequency, so it can only be received by using a mesh cauldron with a C-band tuner and an ordinary set-top box. 9 emits R-band frequency, so it can only be received by circular polarization tuner and small pot of special set-top box. If you don't use a dual-mode machine (built-in C-band receiver and R-band receiver), you need to provide a dedicated receiver for Middle 9 when switching from 6 to 9, as well as a 1.5M mesh antenna and a C-band tuner.