The I321(Y)A - Circulator from Sinclair Technologies is a RF & Microwave Circulator with Frequency 406 to 512 MHz, Bandwidth 12 MHz, Average Power Forward 125 W, Insertion Loss 0.6 to 0.9 dB, Isolation 50 to 75 dB. Tags: Coaxial Circulator. More details for I321(Y)A - Circulator can be seen below.