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The C134-20 from L-3 Narda-ATM is a Dual Directional Coupler with Frequency 2 to 4 GHz, Coupling 20+/-1.25 dB, Coupling Variation +/-1.25 dB, Frequency Sensitivity +/-0.75 dB, Directivity 20 dB. More details for C134-20 can be seen below.
50 dB, 300 W Dual Directional Coupler
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