The TBS2731LW1 from Narda-MITEQ is a RF Mixer with RF Frequency 27500 to 31000 MHz, LO Frequency 25100 to 30050 MHz, IF Frequency 950 to 2400 MHz, Conversion Loss 6 dB, Noise Figure 10.5 dB. Tags: Module with Connectors, Triple Balanced Mixer. More details for TBS2731LW1 can be seen below.