The JIC0300T0420N10 from JQL Electronics is a RF & Microwave Isolator with Frequency 300 to 420 MHz, Average Power Forward 200 W, Average Power Reverse 100 W, Insertion Loss 0.5 dB, Isolation 17 dB. Tags: Module with Connector, Coaxial Isolator. More details for JIC0300T0420N10 can be seen below.