[CQ-Contest] Feedline length

[Marco]

Hi guys, I've heard several times that the length of a feedline must be =
cut to 1/2 wavelength or multiple (1, 1.5, 2, ...).
Someone else say it's better odd multiples of a 1/4 wavelength (1/4, =
3/4, 5/4, ...) to minimize interaction between feedlines running the =
same path, for example when feeding monoband beams.
Is there any particular reason to do in a way or another?
Why?
If it's 1/2 wavelength or multiples you have the same impedance you read =
at the antenna terminals (assuming 0 losses), but is really necessary to =
do this?
If it's, for example, 0.32 wavelength you can read a complex impedance =
down in the shack: and then, what can happen?
Why you don't simply cut random length?
What's the difference if you read a pure resistance or a complex =
impedance at the beginning of the line (pa or rtx)?
Bye, Marco IK2XSL.
ik2xsl at amsat.org


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