The I221(Y)T-(Z) - Isolator from Sinclair Technologies is a RF & Microwave Isolator with Frequency 138 to 174 MHz, Bandwidth 5 MHz, Average Power 125 W, Insertion Loss 0.7 to 1 dB, Isolation 50 to 75 dB. Tags: Module with Connectors, Coaxial Isolator. More details for I221(Y)T-(Z) - Isolator can be seen below.