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The 3W512 from Anaren Inc is a Balun with Frequency 1800 to 2200 MHz, Impedance Ratio (Num) 1:0.25, Insertion Loss 0.4 dB, Amplitude Balance 0.4 dB, Phase Balance 180 deg. More details for 3W512 can be seen below.
1:1 Transmission Line Transformer from 45 to 1200 MHz
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