The MR141L from Spectrum Control is a RF Mixer with RF Frequency 3000 to 18000 MHz, LO Frequency 3000 to 18000 MHz, IF Frequency 0 to 500 MHz, Conversion Loss 5.5 dB, LO Drive - Power 10 dBm. Tags: Module with Connectors, Double Balanced Mixer. More details for MR141L can be seen below.