[Boatanchors] coax

[Sudipta Ghose]

Hi All!
I live in India. When burying PVC pipes to be used as conduits for cables, I
found that the PVC is gnawed away by termites in a month or so.
You may not have such infestations though.
73s
SG

On Fri, Apr 1, 2011 at 7:26 AM, Duane Fischer, W8DBF <dfischer at usol.com>wrote:

> Hi Rick,
>
> As for myself, my property has a grade of 15 degrees from south to north. I
> have a forty foot tower in the Pine Woods to the south. I have my forty
> meter double bazooka at 32 feet for the apex and the eighty meter double
> bazooka apex at forty feet. I am using 9913F coax. I buried PVC pipe in the
> ground from the antenna tower twenty feet to the East. Then another 125
> foot
> from there to the Shack running North. I sealed the end of the PVC
> watertight where the two coax lines enter it. The other end is open. Since
> it is running at a downhill angle I let Nature remove any water that gets
> inside the sealed PVC pipes.
>
> Since you are going across a driveway the water is apt to accumulate inside
> your PVC pipe. If there is any way that you can use two pipes of equal
> length and position them so that where they join is several inches higher
> then the two open ends. You would eliminate any water accumulating.
>
> If you can not do that, I would run the coax through the PVC and then use
> some of the new super sealant they are using on roofs and satellite dish on
> roofs. This stuff is waterproof, UV resistant, is shaped like putty and
> hardens like concrete. I was told this by an antenna installation
> specialist
> yesterday. He said that when used on a roof to prevent any water from
> seeping through holes cut through the shingles for coax or antenna mounting
> bolts, that when it hardens it is next to impossible to get the stuff off.
> He claims if you try to remove it from the shingles you are going to pull
> them right off the roof! So it sounds like a mighty good formable sealant.
>
> If I remember right, it is about 3/16 thick and 1.5 - 2.0 wide. It comes
> like a roll of tape does.
>
> If you seal both ends of the PVC with that, you should not have to worry
> about water. More importantly, you will not have to worry about shrinkage
> and expansion due to Summer heat or Winter cold! Or so it is claimed.
> Perhaps someone else on this list can give you more details.
>
> Duane, W8DBF
>
>
> ----- Original Message -----
> From: "Rick" <rickb at tx.rr.com>
> To: <boatanchors at mailman.qth.net>
> Sent: Thursday, March 31, 2011 4:30 PM
> Subject: [Boatanchors] coax
>
>
> >I have a couple of antennas with which I use coax to the shack. The coax
> >has
> > to cross my driveway and I want to run it through buried PVC. Is it best
> > to
> > use lateral lines or at least drill several drain holes in the PVC to
> > prevent moisture buildup or is it better to try and keep the PVC dry? It
> > will run about 15'. I am using "bury type" coax.
> >
> > Thanks. Rick/K5IAR
> >
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