The ZGDC6-521-N+ from Mini Circuits is a Directional Coupler with Frequency 130 to 520 MHz, Coupling 6 dB, Coupling Variation ±1.0 dB, Directivity 18 to 26 dB, Average Power 60 W. Tags: Module with Connectors. More details for ZGDC6-521-N+ can be seen below.