Balun unun construction3/9/2024 ![]() ![]() 27 glass tape) 50Ω: bifilar wound #14, wrap one wire with 1 layer of Scotch No. Line Impedance, Z0 For 1:1 make equal to load and line impedance For 4:1, make geometric mean of line and load impedance (e.g., 50Ω to 200Ω requires 100Ω line) Transmission line examples Parallel line (wrap with Scotch No. ![]() High choking reactance, 250Ω minimum (limits low frequency response) Low stray capacitance (limits high frequency response) Short transmission line, << ¼ wave (The shorter, the better) High power handling Minimize resistive losses Correct core selection Robust mechanical design Isolate transmission line from antenna (suppresses “inverted-L mode”) Provide balanced output currents into unequal dipole leg impedances Misconceptions Will affect antenna bandwidth Inefficient & prone to core saturation Provides lightening protection 2 Outline 1:1 & 4:1 Balun description Design ConsiderationsĬonstruction Materials Construction Steps Parts Sources Questions?Ĥ Baluns for Antennas Purpose Misconceptions
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