Hi John, Never use PVC drain pipe to bury coax or other cable, the molecules are that far apart that water eventually gets in no matter what. Better to use the same pipe your water supplier uses to get the water to your house, think its Polypropylene or something like that. That pipe will not let water out or in, the water company hates to lose water. That's why they don't use PVC which is a lot cheaper and mostly used for draining water when that leaks through the material into the ground nobody knows or cares.
73 Gert, PA3AAV -----Oorspronkelijk bericht----- Van: Topband [mailto:topband-boun...@contesting.com] Namens John Verzonden: donderdag 5 oktober 2017 8:11 Aan: topband@contesting.com Onderwerp: Topband: underground cables question Hi all, some years ago I buried a 4 inch conduit about a foot deep in my field , inside I run a control wire and a coax line RG213 to a 160 m vertical the feeder was a total of 5/4 wavelength long about half of it in the conduit, it was used as one line for a pair of verticals spaced 5/8 wave apart. When first installed it worked very good but after a while I noticed it dropped off and I suspected water ingress. An insulation test with 1000v from my electricians test equipment showed indeed a fall in insulation resistance. So my question is I have a couple of large reels of commscope F1160 BEF flooded 75 ohm do you think I could put it in the same conduit which has allowed some water in or would you make alternative arrangements . I realise it a direct bury coax but appreciate advice. I wish to get the two verticals going again will use 1 X 3/4 line above ground 1x5/4 line part in conduit and a 1/2 wave to switch in and out above ground. regards John Beaumont G4EIM _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband