The MR144M from Spectrum Control is a RF Mixer with RF Frequency 4000 to 18000 MHz, LO Frequency 4000 to 18000 MHz, IF Frequency 0 to 1000 MHz, Conversion Loss 6 dB, LO Drive - Power 13 dBm. Tags: Module with Connectors, Double Balanced Mixer. More details for MR144M can be seen below.