The MDL540 from R & K Company Limited is a RF Mixer with LO Frequency 5 to 500 MHz, IF Frequency DC to 500 MHz, Conversion Loss 6 to 8 dB, LO Drive - Power 7 dBm, P1dB 2 dBm. Tags: Drop-In, Double Balanced Mixer. More details for MDL540 can be seen below.