The ATc1.6-1.8 from Narda-ATM is a RF & Microwave Circulator with Frequency 1.6 to 1.8 GHz, Average Power Forward 2 W, Peak Power 350 W, Insertion Loss 0.3 to 0.4 dB, Isolation 20 to 23 dB. Tags: Coaxial Circulator. More details for ATc1.6-1.8 can be seen below.