|[AMRadio] Ladder-line mounting question|
jpl15 at panix.com
Sun Oct 23 12:30:20 EDT 2005
Just got my fence-perimeter NVIS loop installed yesterday (thanks to
the kind slave-labor assistance of Brad, KB7FQR). I'm using 450-ohm
feedline from the loop back to the tuner in the shack. It comes thru a
hole in the shack wall and I had planned to suspend it along the rafters
on those large 'bicycle hooks' for the 20 or so feet from the entry point
over to where the Gear all lives.
It has been suggested that this is a Not Good Thing - that any metallic
object like that touching the ladder-line will alter the impedance, stress
the insulation, etc.
I can see the insulation concern, but I don't get how a pice of 3/8ths
steel rod covered with plastic at right-angles to the feedline conductors
can make much of an impedance bump.
So I thought to solicit the general wisdom of those of us who might know
the real 411 on this subject, because I'm not the brightest bulb in the
marquee when it comes to HF antennae and feedlines.
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