The R&S FS-Z90 from Rohde & Schwarz is a Waveguide Mixer with RF Frequency 60 to 90 GHz, LO Frequency 7.44 to 15.34 GHz, IF Frequency 5 MHz to 6 GHz, Conversion Loss 16 to 22 dB, LO Drive Level 13.5 to 18 dBm. Tags: Harmonic Mixer. More details for R&S FS-Z90 can be seen below.