The RC3538XN-600-800 from ZTS Technologies is a RF & Microwave Circulator with Frequency 600 to 800 MHz, Average Power Forward 300 W, Insertion Loss 0.6 dB, Isolation 19 dB, Operating Temperature -10 to 60 Degree C. Tags: Module with Connectors, Coaxial Circulator. More details for RC3538XN-600-800 can be seen below.