[Boatanchors] coax

[Duane Fischer, W8DBF]

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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