Personally I've used 4 inch black corrugated drainage pipe (perforated) with
good success. It's very flexible and allows one to make long radius sweep
elbows and I've never had a problem pulling new cables and having them snag on
the corrugations. I use the rot resistant poly electrical pull string/rope for
a pull rope. I dug the trench with a rental Ditch Witch, laid down landscaping
fabric into the trench and brought it up both sides. Installed the pipe and
then wrapped the two side of landscape fabric over the top of the pipe to keep
out large amounts of mud. After three years, all looks good. At the exposed
ends, I bought the plastic cap for the pipe and slotted it to allow the cables
to exit but keep out the critters. Only problem is the new puppy likes to rip
off the caps and chew on them (better than the cables!!). My max run is 150
ft. for what that's worth. Phil KB9CRY
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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