The CSDZ-5H-1.9G SQ from Crane Aerospace & Electronics is a Directional Coupler with Frequency 1700 to 2000 MHz, Coupling 4.9 dB, Coupling Variation ±0.2 dB, Frequency Sensitivity ±0.05 dB, Directivity 25 dB. Tags: Surface Mount. More details for CSDZ-5H-1.9G SQ can be seen below.