The QIQ21-23-3.5 from Qualink Microwave is a RF Mixer with RF Frequency DC to 3.5 GHz, LO Frequency 21 to 23 GHz, IF Frequency DC to 3.5 GHz, Image Rejection 25 dBc, Conversion Loss 10 dB. Tags: Module with Connectors, I/Q Mixer. More details for QIQ21-23-3.5 can be seen below.