The 8511B, combined with a 45 MHz to 50 GHz frequency converter, with the 8510C Network Analyzer results in a general purpose four-channel magnitude/phase receiver. Add your own power splitters for transmission measurements, and bridges or directional couplers for reflection measurements. Since one input is used for system phase-lock, the other three inputs are available for measurements of multiport devices, subsystems, and antennas. All four inputs on the 8511B have precision 2.4 mm connectors.