The 1CSX327-20 from Werbel Microwave is a Directional Coupler with Frequency 300 MHz to 2.7 GHz, Coupling 20 dB, Coupling Variation ±1.50 dB, Directivity 20 dB, Average Power 25 to 50 W. Tags: Module with Connectors. More details for 1CSX327-20 can be seen below.