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The HDL-4-40 from MCLI is a Dual Directional Coupler with Frequency 0.1 to 1000 MHz, Coupling 40 dB, Frequency Sensitivity 0.5 dB, Directivity 20 dB, Insertion Loss 0.6 dB. Tags: Dual Directional Coupler. More details for HDL-4-40 can be seen below.
50 dB, 300 W Dual Directional Coupler
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