The RFCR2137 from RF-CI is a RF & Microwave Circulator with Frequency 791 to 821 MHz, Average Power Forward 200 W, Average Power Reverse 200 W, Peak Power 1000 W, Insertion Loss 0.2 to 0.35 dB. Tags: Drop-in Circulator. More details for RFCR2137 can be seen below.