The CC-605-283 from RF & Noise Components is a RF & Microwave Circulator with Frequency 550 to 660 MHz, Average Power Forward 600 W, Insertion Loss 0.15 to 0.2 dB, Isolation 23 to 24 dB, Return Loss 23 to 24 dB. Tags: Module with Connectors, Coaxial Circulator. More details for CC-605-283 can be seen below.