[TowerTalk] Buried or Elevated

[Jim Thomson]

Date: Thu, 28 Jan 2016 16:26:53 -0500
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk at tm.net>
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Buried or Elevated

I installed a "pull rope, or messenger cable" when I installed the 
conduit.  No need for the exercise of blowing a cable through the pipe. 
    The rope is a bit over twice the conduit length.  4th photo from the 
top on http://www.rogerhalstead.com/ham_files/cablebox.htm

73

Roger  (K8RI)

##  Buried  PVC, like  3 or  4 or 5 inch....works most of the time, but it can be a crap shoot.
After working at the the local telco for 34 years, I have seen it all..and heard all the stories from
co-horts who worked outside all year round.  Some would be dry as a bone after years...and some
looked like you pumped one helluva lot of water into them.   I have seen some splice box tubs that
had to be pumped everytime they had to be worked on, and with lid removed, they would be full to the
top with water, while others were dry. 

##  the other problem with water ingress..... depending on outside temps, and frost line,  water will freeze,
ice expands, then causes more problems, with pvc bursting or cracking..which allows more water in come spring time.
Any coax or cables you stuff through the pvc should be able to be immersed in water.  The other issue is the pvc
settling at a low point, somewhere along its say  200 ft length.   Get water in there, and it will pool up at the low point..
then have fun trying to dry it out. 

Jim   VE7RF