The APTDC-30-00300800-SMA from AmpliTech, Inc. is a Directional Coupler with Frequency 300 to 8000 MHz, Coupling 30 dB, Coupling Variation ±2 dB, Frequency Sensitivity ±0.6 to 1.2 dB, Directivity 14 to 23 dB. Tags: Module with Connectors. More details for APTDC-30-00300800-SMA can be seen below.