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The 1800BL18B200 from Johanson Technology is a Balun with Frequency 1700 to 1900 MHz, Impedance Ratio (Num) 1:4, Insertion Loss 0.8 dB, Amplitude Balance 2.0 dB, Phase Balance 180°±10° degrees. More details for 1800BL18B200 can be seen below.
1:1 Transmission Line Transformer from 45 to 1200 MHz
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