The RFCR2139 from RF-CI is a RF & Microwave Circulator with Frequency 728 to 756 MHz, Average Power Forward 200 W, Average Power Reverse 200 W, Peak Power 1000 W, Insertion Loss 0.2 to 0.3 dB. Tags: Drop-in Circulator. More details for RFCR2139 can be seen below.