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CATV HARDLINE
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by N8XP on December 18, 2001
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Has anyone tried to bury CATV 75 Ohm hardline? I have heard that it's okay to put the stuff in the ground,but on the other hand I've heard that it isn't a good idea. If you did bury the CATV stuff was it placed in PVC pipe or what?
The CATV stuff is sure cheaper then the other hardline!
73, Roger N8XP
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RE: CATV HARDLINE
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by w8car on December 18, 2001
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I have several runs of haardline lying on the ground and one run in a conduit. I have noticed no change in the covering or other noise on the line. This line was free from the local cable company (friend works there) so I could, if needed replace it. It has been in use for 8 year s of so and still going strong. The ground chemistry will affect the life of the cable. I live on sand and the cable is usually dry-even after rain so I believe it lasts onger thatn if buried directly in clay or other soil that will attack the AL.
Dan W8CAR
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RE: CATV HARDLINE
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by N9CO on December 19, 2001
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I had a run of the 0.75" diameter un-jacketed (bare Al) stuff that was buried a few inches below ground. It was not in conduit, just laid in a shallow trench and covered up with dirt. Part of the run to the tower goes over my septic drain field. After about 3 years in the ground, the feedline began to develop problems, first manifested by drastic shifts in vswr. I was using WX0B 50:75 ohm un-un's at each end.
This past summer, I went to replace this line with some 0.875" diameter Andrews heliax. I discovered that the catv hardline had seriously weakened in many spots, especially over the septic field. The cable literally fell apart every 1 to 2 feet as I took it out of the ground.
I'm not complaining, though. The hardline was free, and it served me well for 3 years. Although I haven't used it, from what I have heard from those that have, the black jacketed stuff survives much better when buried directly.
73 es GL!
Charlie N9CO
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RE: CATV HARDLINE
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by K2DRH on January 16, 2002
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I agree, depending on the soil, it can corrode in very short order. You can luck out and get jacketed direct burial CATV hardline if you look for it. I had a partial roll when I was in AL and used it only for the buried portions. I got some in-line splices and a coring tool from the local CATV compancy and used the regular stuff above ground. The splices have negligible loss even up to 432 Mhz. If you use it on a tower be sure to secure it well. The aluminum hitting the galvanized steel in the wind will actually produce "shot" noises in the receiver.
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