That is one, but far from the only form of a balun. A single-ended input, differential output amplifier is a balun for example.
Wes N7WS On 5/22/2017 2:42 PM, Ron D'Eau Claire wrote:
It is useful to remember that a so-called "balun" is nothing more than a length of transmission line - most commonly parallel wires. The line needs to be long enough to have sufficient inductance to produce balanced currents at the terminated end. Greater inductance is achievable by winding the transmission line into a coil, and even more if that coil has a ferrite core. So, as Bill notes, the impedance it presents to the source (your rig) will vary based on the impedance of the load, just like any other transmission line. 73, Ron AC7AC
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