Reason why the RAU1 or RAU2 boards must work with the TN14FIU board

The TN14FIU board retains only C-band noises, so that the RAU1 or RAU2 boards perform gain control more precisely. The FIU boards connected to the SYS and IN ports on the RAU1 or RAU2 boards working in gain mode must be TN14FIU boards.

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