The Keysight N9918A-211 N9918A combination analyzer includes a cable and antenna analyzer. Option 210 provides transmission / reflection or S21 and S11 measurement capabilities, along with one-port and enhanced response calibrations. To obtain all four S-parameters, forward and reverse (S11, S21, S12, S22) and full two-port calibration, option 211 should be ordered. Full two-port calibration is the most accurate calibration available…The Keysight N9918A-211 N9918A combination analyzer includes a cable and antenna analyzer. Option 210 provides transmission / reflection or S21 and S11 measurement capabilities, along with one-port and enhanced response calibrations. To obtain all four S-parameters, forward and reverse (S11, S21, S12, S22) and full two-port calibration, option 211 should be ordered. Full two-port calibration is the most accurate calibration available with FieldFox network analyzers.Option 211 also adds A/B and B/A measurement capabilities to the vector voltmeter mode, available as option 308.Option 210 is a prerequisite for option 211. So you must order option 210 if you want option 211.This SKU is for quoting purposes only. Please contact a Tessco sales representative for a customized SKU. Read More