[TowerTalk] Feedline in Conduit

[Phil - KB9CRY]

I agree with Gene; personally I use 4 inch perforated drainage tubing. 
 Unless you can hermetically seal the ends and purge the interior of the 
pipe with dry gas (nitrogen), you'll always get water inside from the 
condensation of the trapped humidity when the ground cools.  So just 
plan for it and don't worry.  Phil  KB9CRY

EUGENE SMAR wrote:

>Jerry:
>
>     I would use solid conduit, with drain holes drilled in the underside of
>the plastic at the low points in the run.  I would  cover these holes with
>flower bed screening material (allows the water to drain out but not in),
>and fix the material in place with three or four pieces of insulated solid
>wire wrapped around the conduit.
>
>     I would dig a small pit underneath the drain holes and fill the pit
>with gravel to act as a drain field for any collected water.  I incorporated
>each of the above items in my tower's conduit design and the cables all seem
>to be ok after two years underground.
>
>     The average ham, I would bet, cannot seal conduits sufficiently
>watertight to preclude the accumulation of some amount of water.  Therefore,
>we have to deal with this reality and provide a means of eliminating the
>water.
>
>73 de
>Gene Smar  AD3F
>
>----- Original Message ----- 
>From: "Jerry Keller" <k3bz at arrl.net>
>To: "(Reflector) TowerTalk" <towertalk at contesting.com>
>Sent: Monday, August 04, 2003 8:44 PM
>Subject: [TowerTalk] Feedline in Conduit
>
>
>  
>
>>I'm getting ready to bury about 60 feet of PVC pipe in the backyard to run
>>my feedlines in.  What's the best way?
>>(1) PVC with drain holes in the bottom (a) laid on gravel bed  (b) no
>>    
>>
>gravel
>  
>
>>bed needed
>>(2) PVC with no drain holes... (a) sealed at both ends to keep out water
>>(b) terminated with an "upside-down J" arrangement to keep out water
>>
>>or something else entirely?  Advice appreciated,   Jerry K3BZ
>>
>>_______________________________________________
>>
>>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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>>    
>>
>
>_______________________________________________
>
>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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>  
>