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The C136-20 from L-3 Narda-ATM is a Dual Directional Coupler with Frequency 7 to 12.4 GHz, Coupling 20+/-1.00 dB, Coupling Variation +/-1.00 dB, Frequency Sensitivity +/-0.5 dB, Directivity 16 dB. More details for C136-20 can be seen below.
50 dB, 300 W Dual Directional Coupler
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