The RFLC-HXD-4 from RF-Lambda is a RF & Microwave Circulator with Frequency 120 to 250 MHz, Bandwidth 10 MHz, Average Power Forward 500 W, Insertion Loss 0.6 dB, Isolation 20 dB. Tags: Coaxial Circulator. More details for RFLC-HXD-4 can be seen below.