BINGO! This fellow did it right.
Bob K4TAX
Avila Edward wrote:
>
> Steve, I agree and gave up worrying about running the 450-ohm ladderline
> through the wall and just shoved what I needed through a 2" hole in the wall
> (never mind it's sharing the hole with a bunch of coax!!) and trying my best
> to clear what I can hung it on the back of the TT 238 tuner....I can't speak
> for any losses, but I can "tune" any freq from 160-10 meters which makes the
> Corsair II quite happy.
>
> 73.....k6sdw
>
> -----Original Message-----
> From: Steve Ellington [mailto:n4lq@iglou.com]
> Sent: Tuesday, January 30, 2001 9:59 AM
> To: Carl Hyde
> Cc: tjednacz@ieee.org; tentec@contesting.com
> Subject: RE: [TenTec]Tuners and ladder line in the shack
>
> >
> > One suggestion was to install a 4:1 Balun just outside the house to
> transform
> > the open wire feeder to coax. Doesn't this defeat the purpose of using an
> open
> > wire feeder to begin with?
> >
> > How about using a PVC conduit to route the ladder line to the operating
> desk?
>
> Yes it does seem to defeat the whole purpose of using open wire feeder.
> The assumption here is that since coax is "shielded" then we can run it
> through walls, over pipes etc. but think about it: If we connect a
> balanced line to coax then rest assured there is going to be plenty of RF
> on the outside of that so called shield. So what did we accomplish that we
> couldn't accomplish by just running some insulated, open wire through the
> wall? Well what we accompished was the introduction of a random, unknown
> and sometimes extream impedance to a transformer which will have an
> unknown effect on the random mess we fed it resulting in who knows what on
> the 50 ohm coax which could have considerable loss on 20m and lower.
>
> In your situation, I would do my best to use balanced line all the way to
> the tuner and make sure it's well insulated. 450 ohm window line is fine
> and it only needs an inch or so clearance. Running it through PVC wouldn't
> help a bit if the pvc is against an electrical conduit. If you ran a 4"
> PVC pipe and somehow suspended the line down the center by using tension
> somehow then that would be great.
>
> Steve Ellington N4LQ
> N4LQ@IGLOU.COM
>
> --
> FAQ on WWW: http://www.contesting.com/FAQ/tentec
> Submissions: tentec@contesting.com
> Administrative requests: tentec-REQUEST@contesting.com
> Problems: owner-tentec@contesting.com
>
> --
> FAQ on WWW: http://www.contesting.com/FAQ/tentec
> Submissions: tentec@contesting.com
> Administrative requests: tentec-REQUEST@contesting.com
> Problems: owner-tentec@contesting.com
--
FAQ on WWW: http://www.contesting.com/FAQ/tentec
Submissions: tentec@contesting.com
Administrative requests: tentec-REQUEST@contesting.com
Problems: owner-tentec@contesting.com
|