The ZFM-4 from Mini Circuits is a RF Mixer with RF Frequency 0 to 1250 MHz, LO Frequency 0 to 5 MHz, IF Frequency 0 to 1250 MHz, Conversion Loss 5.7 to 8.5 dB, LO/RF Isolation 40 dB. Tags: Module with Connectors. More details for ZFM-4 can be seen below.