The FS-Z325 from Rohde & Schwarz is a Waveguide Mixer with RF Frequency 220 to 325 GHz, LO Frequency 10 to 14.77 GHz, IF Frequency 5 MHz to 3 GHz, Conversion Loss 40 dB, LO Drive Level 13 to 16 dBm. Tags: Harmonic Mixer. More details for FS-Z325 can be seen below.