[BC] Air-Dielectric Sections

[DHultsman5@aol.com]

In a message dated 3/5/2007 11:14:19 AM Central Standard Time,  
dynotherm at earthlink.net writes:

> If  you have a 700 foot run of 3 inch air-dielectric line, I'm told that
>  the maximum length per section is 400 feet.  If this is the case,  has
> anyone encountered expansion and contraction issues at the joint  where
> the two sections are combined?  We're planning on doing a  sub-surface
> run in conduit.  I'm assuming we'll need a vault to  get to the joint in
> the future, but is there anything else in terms of  wear and tear that
> should be considered?




I am unaware of the 400 foot limit,  I have seen single runs of 1100  feet on 
FM towers.  If this is the case a bunker will be important but  also  
remember the turning radius off the reel.  At the 570 Khz. site  in Dallas, TX they 
used the telephoine company type tiled cable ducts between  the building 
basement and the towers.  Their original plan was to pull line  from the towers 
toward the building.  Due to the small size of the tower  building pits they 
didn't figure the radius for the bending of the 1-5/8 Heliax  cable.   They ended 
up unreeling the cable outside and downstairs into  the basement of the 
transmitter building and pulling toward the towers requiring  much more time and man 
power to feed the line.
 
Dave
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