I did basically the same thing but used 4" ABS. The DWV sweep fittings are
inexpensive and available at the local home center. I used a combination of
a 90 and a 45 on each end, and as Gene says, don't glue them on the pipe.
It makes pulling the cable much easier. Here's a picture:
73 - JC, K0HPS
[mailto:firstname.lastname@example.org]On Behalf Of email@example.com
Sent: Saturday, July 15, 2006 10:20 AM
To: Paul@PaulFerguson.us; TOWERTALK@contesting.com
Cc: Paul Ferguson
Subject: Re: [TowerTalk] Sealing cables at PVC exit?
From your description I'm not sure exactly how your PVC is configured
at each end. Assuming your PVC emerges from the ground vertically, you
ought to include a PVC U-turn (two 90-degree elbows) in the end(s) so that
the cables emerge DOWNWARD. You can then use attic insulation to stuff the
end(s) of the PVC U's around the cables. And don't glue these U's to the
vertical PVC; let them loose so you can remove them for easier cable
This method: allows for the conduit to breathe, i.e., lets moisture
evaporate to a certain extent; prevents large fauna such as mice from
entering said conduit; and is easy to remove to add/remove cables in the
In my conduit system the ends of the 3 inch PVC's enter steel boxes at
the shack and tower ends. Therefore, I don't need to include such drip
loops in my PVC system. At the shack end the cables are routed from the
steel box into the crawl space underneath the ground-floor shack. In this
manner the moisture from the conduit can be evacuated from the crawl space
through normal ventillation.
Gene Smar AD3F
-------------- Original message ----------------------
From: "Paul Ferguson" <Paul@PaulFerguson.us>
> I am using buried 4-inch PVC pipe to run coax and control cables from
> shack to tower base. The PVC come out of the ground, turn horizontal,
> and end a foot or two above the tower base. The cables will exit the
> PVC, take a small drip loop, and get routed onward.
> What is the best way to seal the end of the PVC around the cables? I
> thought about using a PVC end cap and drilling holes, but adding a
> future cable would be difficult. I am interested in hearing what
> creative solutions others have found.
> TowerTalk mailing list
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