The SHX-TG0301B from Shanghai Huaxiang Computer Communication Engineering is a RF & Microwave Isolator with Frequency 300 to 400 MHz, Bandwidth 30 MHz, Average Power Forward 100 W, Average Power Reverse 100 W (Load Power), Insertion Loss 0.3 dB. Tags: Module with Connector, Coaxial Isolator. More details for SHX-TG0301B can be seen below.
