[TowerTalk] Fwd: Ladder Line Underground

[HansLG at aol.com]

The ladder line has an electric field surrounding it. If this field  
penetrate some lossy dielectric next to the line(like soil) you will get losses.  If 
you do this in a big enough pipe, such as a 4" plastic pipe you have to  make 
sure the ladder line is centered in the pipe. You could also use  (better) a 
metal pipe of some good conductor such as copper or  aluminum. You still should 
make sure the line is centered in the pipe. I think  (but am not absolute 
sure) that you could put a ladder line with 1"  separation in a 4" pipe with good 
result. Just make absolutely sure no water  gets into the pipe (lossy). 
 
I recommend you to, instead, use two baluns at each end  of a coax cable and 
put that cable under the road. You may need  to put the coax in some sort of 
pipe/conduit to make sure you still have a coax  "at the end of the season".
 
Hans N2JFS
 
 
  
____________________________________
 From: barry at mxg.com
To: towertalk at contesting.com
Sent: 11/21/2008  5:58:40 A.M. Eastern Standard Time
Subj: [TowerTalk] Ladder Line  Underground


A question from my Best Man, F/K9ORP:

Can Ladder  Line be run thru underground conduit under a road
to feed antennas on a  tower across the road, with no impact?
By itself?
Would a mix of coax  and ladder line also work?

Barry,  W5GN

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