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The B4859A53 from Anaren Inc is a Balun with Frequency 4800 to 5900 MHz, Impedance Ratio (Num) 1:2, Insertion Loss 0.9 dB, Amplitude Balance 1 dB, Phase Balance 7 deg. More details for B4859A53 can be seen below.
1:1 Transmission Line Transformer from 45 to 1200 MHz
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