The AT-3MIX-7681 from AT Microwave is a Waveguide Mixer with RF Frequency 76 to 81 GHz, LO Frequency 25 to 27 GHz, IF Frequency DC to 6 GHz, Conversion Loss 10 to 13 dB, LO Drive Level 15 to 20 dBm. Tags: Balanced Mixer, Down Converter Mixer, Up Converter Mixer. More details for AT-3MIX-7681 can be seen below.