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The 3A425 from Anaren Inc is a Balun with Frequency 800 to 1000 MHz, Impedance Ratio (Num) 1:0.5, Insertion Loss 0.35 dB, Amplitude Balance 0.4 dB, Phase Balance 180 deg. More details for 3A425 can be seen below.
1:1 Transmission Line Transformer from 45 to 1200 MHz
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