good on the hard line....i may try to get some 1/2 inch for my vhf and uhf
antenna...since i have 50 ft of rg8/9913 running out to it now...the loss is
probably in the 3 db range with the way things are right now.
there is no point in me running latter line for anything here since its only
about 8 feet from the metal window sill where the feedlines cross out to the
metal push up...so if latter line has to be kept away from metal, i could
only run about 8 feet of it, and that across a fairly high traffic region of
the yard.
I think in Jery's case though, taking a run of LMR400 or 9913 out of the
shack to a spot outside away from the house or any metal, and then using a
balun to convert to latter line and the run out to the tower, and then
another short run of 9913 up the tower would work probably pretty good.
Alternatively, the latter line could be angled from some point on the ground
to the top of the tower so it could stay away from the metal tower legs
until the feed point.
I am guessing that is how most people use it.
73
Colin, V A6BKX
From: "John Miller" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, November 27, 2007 11:03 AM
Subject: Re: coax and what to run
> You're right on hard line and what it is. For dipoles, ladderline is
great.
> I don't know anyone who's ever buried it but it's possible. Problem is,
you
> can't put ladder line close to metal or else. It really is the way to go
> though.
> ----- Original Message -----
> From: "Colin McDonald" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, November 27, 2007 11:43 AM
> Subject: Re: coax and what to run
>
>
> > no, latter line is not hard line.
> > Latter line is two wires strung side by side with separators every
couple
> > inches to keep them an exact distance apart.
> > This type of feed line exhibits something around 450ohms of impedance.
> > Hard line is, from what I understand, similar to a typical coax with a
> > center conducter, a dialectric and an outer shield.
> > I have never seen a peace of hardline, so i have no idea if this is
> > correct,
> > but I guess it is since they use regular pl259, SMA and N type
connecters
> > with hardline.
> > I am guessing that hard line is also around 50ohms impedance.
> > The kind of latter line you can get these days is good stuff, all made
out
> > of plastic and well shielded...its fairly cheap too I believe and would
> > make
> > a great feedline for HF.
> > I am not sure, but you can probably get latter line with coating that
can
> > withstand being barried. Its easy enough to use a balun at each end of
> > your
> > latter line to convert back to 50 ohms to run to the radio and antenna.
> > That said, I believe you have an antenna tuner that can be used with
> > latter
> > line right off the back right?
> > That might be your best alternative.
> > If you don't have the tuner, then a simple 4 to 1 balun on each end will
> > suffice.
> > latter line, as was stated before, has very little loss over long
> > distances.
> > The only problem is, that it becomes a part of the radiating antenna, so
> > some have had trouble with RFI and so on from that type of feedline....I
> > think though, that if you use baluns, this should help to reduce any RFI
> > problems.
> > 73
> > Colin, V A6BKX
> > ----- Original Message -----
> > From: "Gery Gaubert" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Tuesday, November 27, 2007 7:27 AM
> > Subject: coax and what to run
> >
> >
> >> Thank s f or al l the info on coax
> >> cable. I have some answers now. I want to use the tower for mostly hf
> >> antennas. Som dipoles and probably a g5rv. Maybe a Carolina Windum.
I
> >> have the uhf antenna on the house about 20 feet up and it sems to be
> >> working for the very few times I use it. I am more interested in the
> >> 10-160 meter bands. I may eventually want to work some on 6 meters but
> >> I do't have a radio for 6 right now.
> >> =20
> >> I went on dxengeneering's website andfound ladder line. Is that what
> >> hams refer to as hard line? =20
> >> =20
> >>
> >>
> >>
> >> --
> >> No virus found in this incoming message.
> >> Checked by AVG Free Edition.
> >> Version: 7.5.503 / Virus Database: 269.16.7/1152 - Release Date:
> > 11/26/2007 10:50 AM
> >>
> >>
> >
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.503 / Virus Database: 269.16.8/1154 - Release Date:
11/27/2007 11:40 AM
>
>
|
