[Elecraft] Random wire lengths for antennas
Ignacy
no9e at arrl.net
Mon Jan 30 14:41:38 EST 2017
KXAT3 has trouble matching high impedance antennas. No problem matching
anything using BL-1, BL-2, or any other 4:1 (or 9:1) balun although for odd
impedances the balun may have substantial losses. But I prefer balun than
antenna-tuner overheating.
Probably all wire longer than 1/4 lambda radiate nearly all. Vertical above
5/8 lambda start generating high lobes. Horizontal add a few db because of
ground reflections but also lobes.
Once I made an experiment trying a vertical with a few radials, a random
long wire with radials, or two random long wires as a semidipole, all fed by
TV ribbon. In all cases, two random wires were the best, often by far,
across bands. But setting up a portable vertical is easy, one long wire is
hard, and 2 long wire is the hardest.
In a nutshell, random wires are fine with exact length unimportant. If
tuning problems, use a small balun.
Ignacy, NO9E
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