I have PVC conduits under my yard because the cables to the towers travel under landscaping and I am not able to dig things up to change or add cables. I have placed a length of half inch hose in each conduit with one end at the lowest point in each conduit. The other end of each hose comes up to the surface along with the coax lines and control cables at the base of each tower. I use a "Wet/Dry" rated shop vacuum to pull the collected water from the conduits via the hoses a couple times a year - and always each fall before the ground freezes. This technique has been working well for me for 19 years.
73 Lloyd - N9LB -----Original Message----- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of John Sent: Thursday, October 05, 2017 3:11 AM To: topband@contesting.com Subject: 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