If one is constructing ladder line, is the point to design the ladder line
so its impedance matches the characteristic impedance of the antenna
itself at its feed point?

The theoretical feed point impedance for a full wave loop antenna is
approximately 100 ohms, (but this does change, and is dependent upon
antenna height above ground, near-by structures, and ground conductivity.)
Should I try to make my ladder line to get as close as possible to this
100 ohm? In other words, does it make any difference reallly if my (12
guage insulated) ladder line uses 4" spacers (550 ohm) or 2" spacers (468
ohm) or 1" spacers (385 ohm) in the final analysis? Should I just go with
the 4" spacing because it looks cool?

Anyone think that maybe non-insulated would be a better way to go?

Zeno


Larry Gagnon wrote:

Hello to all. I intend to erect an 80 meter full size dipole and feed
it with homebrew open ladder line. Would anyone care to reply as to how
to construct ladder line easily and effectively? How does one determine
spacing to get X ohms impedance line?

Also any ideas on how such line can easily be fed in through a window
with a wood frame would be greatly appreciated.

Larry Gagnon VE7EA

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