La description

Key Facts Option R&S®SMATE-B13 converts the internal digital baseband signals of R&S®SMATE-B10/-B11 into analog signals for driving the I/Q modulator. It also generates the analog I/Q out signals. One or two R&S®SMATE-B13 can be installed. The first R&S®SMATE-B13 drives RF path A, the second RF path B. The I/Q output signals are available either for path A or B.
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