The 3A1NDK-S from Renaissance Electronics Corporation is a RF & Microwave Isolator with Frequency 240 to 270 MHz, Average Power Forward 150 W, Peak Power 300 W, Insertion Loss 0.5 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for 3A1NDK-S can be seen below.