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The C135-30 from L-3 Narda-ATM is a Dual Directional Coupler with Frequency 4 to 8 GHz, Coupling 30+/-1.25 dB, Coupling Variation +/-1.25 dB, Frequency Sensitivity +/-0.75 dB, Directivity 18 dB. More details for C135-30 can be seen below.
50 dB, 300 W Dual Directional Coupler
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