[TowerTalk] Coax, conduit and toroids

Perry - K4PWO k4pwo at comcast.net
Wed Jun 27 10:26:39 PDT 2012

Another issue is that most "drain" tubing has a very thin wall compared to
PVC conduit.  If you have rocky soil or will have the "conduit" buried under
a path where vehicles will travel, you will want heavy walled tubing (PVC
EMT conduit).  I have discovered that the "gray" PVC is cheaper than "white"
water PVC in most sizes (in my area of the US at least).  The gray also
stands up better exposed to sunlight.

73 de Perry - K4PWO

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Missouri Guy
Sent: Tuesday, June 26, 2012 11:15 PM
To: kiessig at gmail.com; TowerTalk at contesting.com
Subject: Re: [TowerTalk] Coax, conduit and toroids

> What should I do to help ensure that the inside of the conduit stays 
> dry? Is applying some sort of weatherproof sealing compound to each 
> end enough?


I have a large "conduit" running 200' to one of my towers.  So, speaking
from experience, there is no easy way to keep water out unless you want to
pressurize the conduit with say, dry nitrogen 
gas.   That isn't going to happen!!  :D)
Air will get in there even if you attempt to seal it off, and then it will
just form condensate in the cool ground.
Mold will grow, etc etc.

I found the best way (for me, anyway) is to install a Tee connector at both
ends of the run.  Face the Tee part downward and screen it over to keep out
bugs, snakes, or whatever.  Air will flow through your conduit everytime the
wind blows and will keep things nice and dry.  Here in the US, and probably
in AU, there are some screened aluminum louvers that will work for most of
the larger conduits (like, in my case, 4" PVC tubing).  

As for your other questions...there are some experts on the list who will
address those.

Charlie, N0TT

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