The SHX-TH0301A from Shanghai Huaxiang Computer Communication Engineering is a RF & Microwave Isolator with Frequency 300 to 400 MHz, Bandwidth 30 MHz, Average Power Forward 150 W, Insertion Loss 0.3 dB, Isolation 25 dB. Tags: Module with Connector, Coaxial Isolator. More details for SHX-TH0301A can be seen below.
