[AMRadio] Ladder-line mounting question


Edward B Richards zuu6k at juno.com
Sun Oct 23 13:06:03 EDT 2005


Just to be safe why not suspend the ladder line with long plastic cable
ties? This will keep it at least 6 inches from any metal. Good Luck.

73, Ed K6UUZ

On Sun, 23 Oct 2005 12:30:20 -0400 (EDT) John Lawson <jpl15 at panix.com>
writes:
> 
> 
>    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.
> 
> 
> 
>   Cheers
> 
> John  KB6SCO
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