The RFCR6183 from RF-CI is a RF & Microwave Circulator with Frequency 570 to 670 MHz, Average Power Forward 250 W, Average Power Reverse 250 W, Peak Power 2500 W, Insertion Loss 0.40 to 0.50 dB. Tags: Coaxial Circulator. More details for RFCR6183 can be seen below.