The RCPL-406.0-406.1M-40d-N(f)-10W-z4 from Raditek is a Directional Coupler with Frequency 406.0 to 406.1 MHz, Coupling 40 dB, Coupling Variation ±1 dB, Directivity 20 dB, Average Power 10 W. Tags: Module with Connectors. More details for RCPL-406.0-406.1M-40d-N(f)-10W-z4 can be seen below.