The HJK-421H+ from Mini Circuits is a RF Mixer with RF Frequency 238 to 428 MHz, LO Frequency 268 to 458 MHz, IF Frequency 10 to 150 MHz, Conversion Loss 7.2 to 8.3 dB, LO Drive - Power 17 to 19 dBm. Tags: Surface Mount, Triple Balanced Mixer. More details for HJK-421H+ can be seen below.