The FS-Z500 from Rohde & Schwarz is a Waveguide Mixer with RF Frequency 325 to 500 GHz, LO Frequency 9.02 to 13.88 GHz, IF Frequency 5 MHz to 3 GHz, Conversion Loss 58 to 56 dB, LO Drive Level 14 to 15 dBm. Tags: Harmonic Mixer. More details for FS-Z500 can be seen below.