The CC-510-021 from RF & Noise Components is a RF & Microwave Circulator with Frequency 500 to 520 MHz, Average Power Forward 250 W, Insertion Loss 0.3 to 0.35 dB, Isolation 20 to 23 dB, Return Loss 20 to 23 dB. Tags: Coaxial Circulator. More details for CC-510-021 can be seen below.
