> "Balun", def: the most misused and misunderstood word in all of ham
radio.
My approach, when discussing baluns, is to present the "balun" as a
"function," not necessarily a "thing."
The balun "function" is to transfer power between balanced and
unbalanced systems while at the same time providing isolation between them.
Any "thing" that implements the function can be considered a "balun."
There are lots of "things" that implement the "function."
For example, here's a list of "things" that are all considered to be
"baluns":
- coil of coax
- coax wound on ferrite cores
- coax through ferrite beads
- quarter-wave sleeve
- Guanella transmission-line structure (a.k.a. "current balun")
- Ruthroff transmission-line structure (a.k.a. "voltage balun")
- half-wave transmission-line structure
- etc
Some of the "things" also implement impedance transformation, but
impedance transformers don't necessarily perform the balun "function,"
adding to the general confusion.
73, Ward N0AX
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