The R&S FS-Z75 from Rohde & Schwarz is a Waveguide Mixer with RF Frequency 50 to 75 GHz, LO Frequency 8.0 to 12.8 GHz, IF Frequency 5 MHz to 3.2 GHz, Conversion Loss 20 to 26 dB, LO Drive Level 18 dBm. Tags: Harmonic Mixer. More details for R&S FS-Z75 can be seen below.