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The SB12D2 from Sigatek is a Bias Tee with Frequency 0.1 to 12.4 GHz, Voltage 50 V, Current 0.5 A, Insertion Loss 1.5 dB, Isolation 30 dB. More details for SB12D2 can be seen below.
40 W Coaxial Bias Tee from 700 to 6000 MHz
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