[Johnson] Ladder-line mounting question

[Ron]

John.
In any situation where power is carried through conductors (DC or AC and 
ignoring I**2R losses) , the actual conductor does not hold any energy 
but is the guide or conduit that guides the energy between the two 
conductors .  The energy exists in the field between the two 
conductors.  If you stick a dielectric in that field , you make a 
disturbance in the capacitance at that point and alter the 
impedance....not a big deal if you tune it out.  If you stick a 
conductor in the field , the field will introduce a current in the 
conductor  until it levels out in a static field.  In an AC field , the 
current is always moving back and forth inside the isolated conductor 
and hence a power loss.

Using steel hooks will reduce the usefulness of your AC transmission line.

---
Ron



John Lawson wrote:

>
>
>   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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