[TenTec] openwire feed OT

[Randy Russe3ll]

Well, it doesn't have to be that hard.  For the
original poster who just wanted a temporary set-up,
the easiest thing is to bring them through a window
sash. I simply crack my shack window 3 1/2 ", run a
strip of 1"x4" painted wood, and cut two slits in it
for the wires to fit in.  A drop of caulking to hold
the wires (I use insulated wire anyway)and your done. 
You can also adjust feedline lengths easily without
cutting the feedline. To secure the window from
opening, I cut two strips of wood to wedge in the
slides, and it's better than locking it.  For a more
permament installation, what would be wrong with using
FEED THRU INSULATORS? a  
pair of these and whatever length feedthrough bolt you
need will get you through your walls.  Simply cut a
PVC pipe sleeve long enough to go through the wall
around the bolt, and you have insulatiuon for high
power applications.  Here, this is exactly the
application they make these things for:               
              
http://www.surplussales.com/Antennas/Antennas-6.html
--- Scott Harwood <scotth at hsc.edu> wrote:

> I run mine through the wall with two pieces of RG-8
> coax WITHOUT the shield.  Spacing is same as
> balanced line and uses two separate holes.  
> Scott K4VWK
> ---------- Original Message
> ----------------------------------
> From: "NJ0IP" <Rick at DJ0IP.de>
> Reply-To: Discussion of Ten-Tec Equipment
> <tentec at contesting.com>
> Date:  Thu, 2 Feb 2006 09:20:03 -0800
> 
> >Guys, this may be a stupid question, but if you use
> two parallel pieces of
> >(long) coax, wouldn't you have twice the loss.  On
> the other hand, resistors
> >in parallel would mean half the loss.  In any case,
> coax is lossy, heavy,
> >and expensive, so why would you use a long run of
> two coax cables?
> >
> >Using short lengths to going through the wall is a
> good idea, but then why
> >would you need to tie the shields together at all
> and why ground them?
> >
> >Sinisa?
> >
> >Cheers,
> >Rick
> >
> >-----Original Message-----
> >From: tentec-bounces at contesting.com
> [mailto:tentec-bounces at contesting.com]
> >On Behalf Of Darwin, Keith
> >Sent: Thursday, February 02, 2006 9:05 AM
> >To: Discussion of Ten-Tec Equipment
> >Subject: Re: [TenTec] openwire feed OT
> >
> >Ken (and others)
> >
> >Oh, man, true confession time here :-).  I've only
> done what I described
> >one time, years ago.  I built a coax parallel feed
> line for a loop
> >antenna.  The coax went from the back of the tuner,
> through the window
> >and all the way to the antenna.  I connected the
> shields together at the
> >tuner end of the line and tied it to tuner ground. 
> It worked fine.  I
> >figured the same technique would be great for
> constructing a parallel
> >balanced line for use inside and near things that
> would upset the field.
> >Truth is I'm still not sure what to do with the
> shields :-)
> >
> >I believe that the 2 pieces of coax can go their
> separate ways as long
> >as they start together and end together.  The
> shield isolates the center
> >conductor preventing it from being affected by
> nearby stuff including
> >the other half of the parallel feed line.
> >
> >I got the idea from an article in QST but don't
> really have the
> >engineering or physics data to truly explain how it
> all works.
> >
> >In my personal case I feed RG-8x coax from the rig
> to the tuner which is
> >mounted 50 feet away.  From the tuner I run RG-213
> coax 30 feet to the
> >base of my 28' vert antenna.  Doesn't work well on
> 80 but seems to work
> >well on 40, 30, 20, 17 & 15.
> >
> >- Keith KD1E -
> >
> >-----Original Message-----
> >From: tentec-bounces at contesting.com
> >[mailto:tentec-bounces at contesting.com] On Behalf Of
> K. Indart
> >Sent: Thursday, February 02, 2006 11:31 AM
> >To: Discussion of Ten-Tec Equipment
> >Subject: Re: [TenTec] openwire feed OT
> >
> >Keith,
> >   I have two questions:  Do you keep the two coax
> pieces separated by
> >the same spacing as your feed line,...or can you
> make ONE hole in the
> >wall/window and feed both coax through one hole ?
> >
> >   Does it matter which end of the shields get tied
> together; inside the
> >wall or outside the wall ?
> >
> >   Do you make the lengths of the coax JUST long
> enough to protrude
> >outside and inside of the wall or how long ?
> >
> >Thanks, and it sounds like a very good idea.
> >
> >73, Ken  WA4RPH
> >
> >_______________________________________________
> >TenTec mailing list
> >TenTec at contesting.com
> >http://lists.contesting.com/mailman/listinfo/tentec
> >
> >
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> >TenTec at contesting.com
> >http://lists.contesting.com/mailman/listinfo/tentec
> >
>  
> 
> 
>                    
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