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The HDL-63-40 from MCLI is a Dual Directional Coupler with Coupling 40 dB, Frequency 300 to 330 MHz, Average Power 300 W, Insertion Loss 0.2 dB, Directivity 30 dB. More details for HDL-63-40 can be seen below.
50 dB, 300 W Dual Directional Coupler
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