The F1578 from WENTEQ Microwave Corp is a RF & Microwave Circulator with Frequency 1.5 to 3.3 GHz, Average Power Forward 25 to 100 W, Insertion Loss 0.5 dB, Isolation 20 dB, Operating Temperature -85 Degree C. Tags: Drop-in Circulator. More details for F1578 can be seen below.