The CRF-20A-1000 from Crane Aerospace & Electronics is a Bi-Directional Coupler with Frequency 100 to 1500 MHz, Frequency Sensitivity ±0.5 dB, Coupling 20 dB, Coupling Variation ±1 dB, Power 1 W. Tags: Flatpack, Multi-Octave. More details for CRF-20A-1000 can be seen below.