The RFCR9138N from RF-CI is a RF & Microwave Circulator with Frequency 132 to 174 MHz, Average Power Forward 100 W, Average Power Reverse 50 W, Insertion Loss 0.80 to 1 dB, Isolation 15 to 16 dB. Tags: Coaxial Circulator. More details for RFCR9138N can be seen below.