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The HDL-51-30 from MCLI is a Dual Directional Coupler with Coupling 30 dB, Frequency 2 to 4 GHz, Average Power 300 W, Insertion Loss 0.3 dB, Directivity 15 dB. More details for HDL-51-30 can be seen below.
50 dB, 300 W Dual Directional Coupler
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