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Author Topic: Coax cable: Partially buried & Partially laid on top of ground...  (Read 1742 times)
WX7Q
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Posts: 21




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« on: March 02, 2019, 09:16:48 AM »

Installing a Vertical. The coax will be run part of the way on top of the ground, then the rest will be buried.  Will end up at the ground rod/lightening arrestor, then into the house. What coax will accomplish both?  Should the buried portion be encased in some kind of plastic tubing? ( EX: Garden hose???) Suggestions/thoughts?

TIA

Jim
WX7Q
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VE7REN
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Posts: 637




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« Reply #1 on: March 02, 2019, 09:25:30 AM »

i highly recommend burying the coax in a pvc or grey conduit of some type. I use rg213 and find it my coax of choice.. do not just burry the coax in the ground,and do not leave it lay on the ground either. coyotes,skunks,squirrels,mice,etc will find it and chew on it.
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K7MEM
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« Reply #2 on: March 02, 2019, 04:41:52 PM »

I don't bother using conduit for my coax. I have a 5BTV mounted on a 18 foot section of 2 inch iron pipe. The coax (RG-8) runs down the pipe and under ground (about 6-12 inches). It then runs about 50 feet to my shack.  I have to keep it underground so my horses don't trip over it. I live in a very rural area. Plenty of coyotes, skunks, rabbits, squirrels, and mice. But have never had any issues with the small animals. I have had rats eat the injector wires on my car, but they never touched the coax.

I have checked the coax several times over the years and don't see any degradation in the outer jacket. I am sure that the better coaxes (less loss) will do as well.
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Martin - K7MEM
http://www.k7mem.com
K0BT
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« Reply #3 on: March 03, 2019, 09:02:52 AM »

Jim,

As Martin said, most coax will last for years outside even when buried.  In areas where the ground stays saturated, the coax types with a PE (Polyethylene) jacket (E.g. Davis 9914F Bury-Flex) are supposed to be more durable (abrasion/cut resistant) and weather resistant than coax with the usual PVCE outer jacket.  Your typical coax is water proof but  sharp rocks and such can nick the outer jacket and allow water to seep in. You won't know right away and it's a hard problem to locate.

An inexpensive "conduit" for coax is the black 1/2" drip-irrigation pipe sold at home improvement stores in 100' rolls. You can push coax through it easily or you can tie a cotton ball to some fishing line and use a vacuum to pull it through the pipe.  The potential problem with conduit is that it holds water in as well as out. A leak can fill the pipe underground and you might not know.

I ran 250+ feet of Andrew Superflex with irrigation pipe buried next to it for a future run or coax or control lines. It's buried for about 150' of the run.

Bob

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VE7REN
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« Reply #4 on: March 03, 2019, 05:54:21 PM »

quote-I don't bother using conduit for my coax. I have a 5BTV mounted on a 18 foot section of 2 inch iron pipe. The coax (RG-8) runs down the pipe and under ground (about 6-12 inches). It then runs about 50 feet to my shack.  I have to keep it underground so my horses don't trip over it. I live in a very rural area. Plenty of coyotes, skunks, rabbits, squirrels, and mice. But have never had any issues with the small animals. I have had rats eat the injector wires on my car, but they never touched the coax.- end quote


for the price of some conduit or black water line.. ide rather do this then chance it...1 nick is all you need to screw all the swr and ruin the coax....
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WX7Q
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Posts: 21




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« Reply #5 on: March 12, 2019, 05:12:20 PM »

I don't bother using conduit for my coax. I have a 5BTV mounted on a 18 foot section of 2 inch iron pipe. The coax (RG-8) runs down the pipe and under ground (about 6-12 inches). It then runs about 50 feet to my shack.  I have to keep it underground so my horses don't trip over it. I live in a very rural area. Plenty of coyotes, skunks, rabbits, squirrels, and mice. But have never had any issues with the small animals. I have had rats eat the injector wires on my car, but they never touched the coax.

I have checked the coax several times over the years and don't see any degradation in the outer jacket. I am sure that the better coaxes (less loss) will do as well.


Here's why...

https://www.freep.com/story/news/local/michigan/oakland/2018/05/07/rats-rodents-cars-vehicles/578398002/

WX7Q
Jim
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K0UA
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« Reply #6 on: March 24, 2019, 08:45:22 AM »

I think the likelihood of rodent damage varies from place to place.  Some here have experienced the damage, and I know it must be a problem in some areas because the telephony industry goes to great lengths to armor their underground cables.  But I have never had a problem with exposed or underground coax cable here in southwest Missouri.
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73  James K0UA
ARRL Missouri Technical Specialist
K0CWO
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« Reply #7 on: March 24, 2019, 08:53:00 AM »

I have buried a run of DXE-8X a couple of inches under the lawn.  Works fine and has lasted a long time (10 years).

73, k0cwo
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W1VT
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« Reply #8 on: March 24, 2019, 10:20:28 AM »

The rodents only bother RG-8X sized cable in my yard. Repeatedly.  They haven't bothered RG-6, RG-58, or RG-8 sized cables!
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WB4M
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« Reply #9 on: March 26, 2019, 11:29:03 AM »

I just used some Davis direct-bury coax.. ran about 60 feet of it only 3-4 inches under the surface.  I also live in a very rural area with every animal except bears and never a problem with any exposed coax.   Matter of fact, the only problem I had was over 30 years ago at a former location, when I had a dog chew up the 160 meter coil on my ground mounted Butternut HF6V.   I had previously run 213 inside a black pipe of some type, don't even remember what it was.  Everyone said water would collect in the pipe.  Years later I took the 213 out and it was dry as a bone.   
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OH2RM
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Posts: 10




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« Reply #10 on: June 03, 2019, 10:11:55 PM »

I have installed 2" aluminium ducts to run the cables under the lawn. The ducts serve as additional lightning protection and enable me to easily change the cables. Larger diameter allows cables to be pulled out with their connectors. Have drilled some holes along the ducts (on the bottom side) to let water out. Additionally the ducts are a little inclined to prevent water accumulation.

Recommend this practice as it keeps the cables away from the XYL and her lawnmower as well  Grin
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