![]() Its purpose is to provide high impedance to common-mode current on the transmission line: it "chokes" that current. I am not a expert (real or self-anointed) of baluns, impedance transformers, from surrounding objects that may actually make the antenna a-symmetrical), and a coax (unbalanced transmission line), the current balun rejects the common-mode and passes the differential voltage.Īs the name suggests, an " UnUn" is bi-directional adapter When placed between a balanced device such as a symmetrical antenna (ignoring stray capacitances etc. Interpretation is of what they are, how they work, how to build a good one, etc., I refer to theġ:1 AND 4:1 BALUN TRANSFORMERS THAT I USE Transmission lines, transmission line transformers, etc. Understanding building and using baluns and ununs pdf how to# My 1:1 and 4:1 baluns are BL1 and BL2 kits from Elecraft (ref. The BL1 uses a two-hole "binocular" ferrite core (a.k.a. "pig nose") of type BN43-7051, and has two sets of thermostat wire windings. ![]() It includes a DPDT slide-switch for changing The BL2 uses two stacked ferrite cores of the same type, for increased power The balun is rated for 150 watt (when connected to a 200 Ω load). ![]() There are many different ferrite material mixes. ![]() Understanding building and using baluns and ununs pdf full#.Understanding building and using baluns and ununs pdf how to#.
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