Hi Ward,
The problem is that all of these "things" work better or worse than
others, are more or less frequency-sensitive than others, and have
unintended consequences.
For example, the coil of coax and quarter wave sleeve are VERY frequency
sensitive and the coil of coax is quite sensitive to the length of the
transmission line. Coax through ferrite beads depends STRONGLY on which
beads are used, and the operating frequency.
73, Jim K9YC
On 12/12/2017 9:19 AM, Ward Silver wrote:
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.
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