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The C137-20 from L-3 Narda-ATM is a Dual Directional Coupler with Frequency 12.4 to 18 GHz, Coupling 20+/-1.25 dB, Coupling Variation +/-1.25 dB, Frequency Sensitivity +/-0.6 dB, Directivity 15 dB. More details for C137-20 can be seen below.
50 dB, 300 W Dual Directional Coupler
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