The HD32981 from HD Communications Corp is a RF & Microwave Circulator with Frequency 0.47 to 0.6 GHz, Average Power 200 W, Insertion Loss 0.3 dB, Isolation 20 dB, Operating Temperature -30 to 70 Degree C. Tags: TAB, Drop-in Circulator. More details for HD32981 can be seen below.