[TowerTalk] Trenching & PVC

Grant Saviers grants2 at pacbell.net
Sun Jan 28 23:06:02 EST 2018

"Sharp and sweeping" turns are a bit confusing as to actual possible 
radii of the turn.  For 125' run a two 90 deg large radius (36") sweeps 
of 3" conduit all should be ok for 4 RG8 size coax and rotator cable.  
If you are using hardline probably not.  Buryflex would be my choice, 
flexible and tough and PE (polyethylene) for water resistance.  Use a PE 
sheathed rotator cable

NO DRAIN HOLES!   Use sch 40 PVC 3" conduit as designed, trench, glue it 
all up, drop into the trench, cover, measure with conduit measuring tape 
and pull everything together with pull or mule flat tape or braided rope 
(not 3 strand) and liberally applied pulling lube.

Lot's more if you search the TT archives.

Grant KZ1W

On 1/28/2018 17:09 PM, w1pdi--- via TowerTalk wrote:
> I’m finalizing my list of what’s needed for my tower projectand what needs to be done either before or after the tower is up.
> Routing of 4 coax and rotor cable has to be decided. Eithertrench approx. 125 ft from base of tower to house entry point where there’s asharp 90 degree turn from behind the detached garage where the tower will be for20ft, the sharp angle then straight to house entry point 105ft away.
> Potential trouble with this route 1): 90 degree turn asmentioned and because the neighbor’s property line is so close I can’t make ita sweeping turn.
> 2) Garage gutters run into n in ground PVC storm drain pipethat runs towards the front of house in the same direction as coax and cablewould run. We’re not sure yet where this drain system is located but trenchingfor Coax/cable PVC could become an issue.
> 3) Tree roots from an oak and maple tree are in the pathabout 35 to 40ft from the 90 degree turn.
> I suggested one option that was shot down by a few and thatis run coax and cable off tower through the length of garage (38ft) and exitopposite side of garage then trench and bury thru PVC for about 50ft.
> Any problems in routing thru garage?
> Also, will regular 3” PVC piping be OK? The gray electricalgrade would be nice, and expensive.
> Should the PVC with drain holes be the right selection?
> Buy solid PVC and drill my own drain holes in it?
> Advice would be appreciated.
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