[Antennas] ladder line questions

Fri, 14 Nov 2003 08:14:16 -0800 (PST)

Bill,

I don't see no stickin' peaktures !!??

I'm close to rigging up a dipole and in waiting for
the ladder line to come,wondered about this very
thing.

73
Steve  [email protected]

--- HSHK <[email protected]> wrote:
> Hi Jackie,
>  
> Besides using a 4:1 balun and then running coax, you
> can
> do away with the balun and use balanced coax.
>  
> What is balanced coax ? It is two pieces of coax
> soldered
> so the braids are soldered together and then both
> center
> condictors are connected to the ladder line at one
> end and the
> tuner at the other. Making a form of shielded
> balanced line.
>  
> If you'd like to make some ladder line, the attached
> pics will
> show you how I have done it. It workes great and the
> stuff
> will probably outlast me!
>  
> Also attached are pics of commercial 450-ohm
> windowed
> ladder line running alongside of my aluminum sided
> house.
>  
> The ladder line is suspended away from the house by
> using
> 30-lbs test fishing line. Fishing line attached to
> the house with a small
> eyelet is tied to the ladder line and another piece
> from the ladder
> line to a tree. This keeps the ladder-line hanging
> three feet away
> from the house. I have a section that runs 25 feet
> alongside of the
> house parallel to the driveway.
>  
> To get the ladder-line into the house... I cut a
> piece of wood to
> fit in the window the way the older style window
> screens used to,
> so the windwo could then be closed down onto the
> wood. The wood
> has a slot cut into it and the ladder-line comes in
> through it. In the
> winter, some fiberglass insulation is place over the
> wood on the
> insided and the window covered with the plastic that
> is shrunk with
> a hair dryer. Has worked well for the past three
> years.
>  
> For lightning protection, I use a double pole-double
> throw knife
> switch I bought at a ham fest just inside the
> window. One postion
> it connects to a short piece of ladder-line and to
> the tuner. The other
> position conects the line (both sides) to a one inch
> braided ground line
> connected to my earth ground.
>  
> Hope some of this helps.
>  
> 73,
>  
> Bill KA8VIT
> [email protected]
> www.qsl.net/ka8vit
>  
> -------Original Message-------
>  
> From: [email protected]
> Date: Friday, November 14, 2003 12:02:22 AM
> To: [email protected]
> Subject: [Antennas] ladder line questions
>  
> I would like to put up a closed loop, feed it with
> ladder line and go into a
> tuner. Although I would like to make my own at some
> point, I will settle
> for the insulated 450 ohm variety at this time until
> I get more ambitious.
>  
> So here are the questions:
>  
> 1- Aside from using a 4:1 balun and using coax into
> the house, I would like
> to know what will interfere with the ladder line
> that I should avoid. Can
> it be put under a window sill or into a pvc pipe or
> a metal pipe? I think
> the first two are OK but the metal pipe is not. If
> it is interrupted by a
> binding post or connector thru Plexiglas to get
> through a window I would
> think the impedance would be screwed up by doing so.
> Is this true? So what
> does one do or not do?
>  
> 2-What is being used to offer some lightening
> protection to ladder line.
> There does not seem to be too much in the way of
> surge protectors around for
> such.
>  
> Any help is appreciated and since I just joined the
> list I hope these
> questions have not been beaten to death lately!
> Thanks in advance for any
> help or comments.
>  
> - - -
> 
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
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