The 8753D Option K36 is a duplexer test set adapter (extension) box that mates with either the 8753C or 8753D network analyzer or the 85046A test set. This extension box provides three test ports to allow duplexers to be tested directly. The 8753D Option K36 contains a single solid-state switch. The test port connectors are Type "N." The 8753D Option K36 is controlled through the test set interconnect on the rear of the 8753C/D. The 8753D Option K36 can make the following forward and reverse measurements: Tx Reflection (S11) Rx Reflection (S11) Ant Reflection (S22) Tx-to-Ant Trans. (S21) Rx-to-Ant Trans. (S21) Ant-to-Rx Trans. (S12) Ant-to-Tx Trans. (S12)