The M1971E from Keysight Technologies is a Waveguide Mixer with RF Frequency 55/60 to 90 GHz, LO Frequency 8300 to 12400 MHz, IF Frequency 100 to 2500 MHz, Conversion Loss 20 to 30 dB, Operating Temperature 0 to 55 Degrees C. Tags: Harmonic Mixer. More details for M1971E can be seen below.