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Burying Coax
I would like to bury my coax for a distance of about 20ft. The location
consist of 6" of crushed decorative rocks over the top of very rocky soil. I intend to take the LMR-400 coax and push it through a garden hose to add a layer of protection. However, I am worried that condensation will quickly fill the airspace of the hose with water and it will either penetrate the coax outer jacket or interfere with the performance of it in some unknown negative way. I can not flood the garden hose with petroleum oil as it will soon eat through the PVC jacket of the coax or garden hose. Ideally, I would like to flood the hose with the same stuff they put into underground cables. It has a honey consistency and is not easily displaced by water. I was hoping for some type of silicon oil but am unable to find anything similar at the hardware store. Anybody have any suggestions? |
"yea right" wrote in message ... I would like to bury my coax for a distance of about 20ft. The location consist of 6" of crushed decorative rocks over the top of very rocky soil. I intend to take the LMR-400 coax and push it through a garden hose to add a layer of protection. However, I am worried that condensation will quickly fill the airspace of the hose with water and it will either penetrate the coax outer jacket or interfere with the performance of it in some unknown negative way. I can not flood the garden hose with petroleum oil as it will soon eat through the PVC jacket of the coax or garden hose. Ideally, I would like to flood the hose with the same stuff they put into underground cables. It has a honey consistency and is not easily displaced by water. I was hoping for some type of silicon oil but am unable to find anything similar at the hardware store. Anybody have any suggestions? Get two rubber / plastic boots - the type used on electrical installations. a large container of petroleum or KY jelly fill both end of the hose once you have the coaxial through it this should stop any air getting in or out and so prevent the condensation problem. Finally put the boots over tube ends again filled with jelly and using come electrical tape , tape over it. Go over the electrical tape with self amalgamating tape them one more layer of electrical tape to keep out the UV and "BOBS your uncle" job should be a good one. TTFN Martin G1GYC |
Use rigid PVC tubing, cement fittings as needed. It will provide more physical
protection than a garden hose. Any condensation that develops should be minimal. However, even if it were severe, if the coax couldn't stand up to it then it couldn't stand up to rain, snow, frost, etc. either. I used coax buried in this way and had no trouble with it for 15 years. |
Don't worry about it. Save the 'worry' for something that's more likely to happen, you may run short... 'Doc |
"helmsman" wrote in message ... yea right wrote: . Don't buy goods made in France or Germany and vacation somewhere else! And you call that a OM, respectfully of the ham spirit, worldwide ? Thierry ON4SKY, LX3SKY |
Yea right, tell that to the 1000's of Americans buried there defending those
countries. Damm straight I don't buy anything made there much less vacation there!! If I had my way, we would disinter all of them and bring them home to hallowed ground here in America! Screw the french and the krauts! de jer "Thierry" see my website wrote in message ... "helmsman" wrote in message ... yea right wrote: . Don't buy goods made in France or Germany and vacation somewhere else! And you call that a OM, respectfully of the ham spirit, worldwide ? Thierry ON4SKY, LX3SKY |
Hi yea right
I would use standard PVC conduit and boxes, it's cheaper than garden hose and more impervious to cuts. I doubt if your going to be able to 'push' a coax through a hose, or even conduit for that matter. You will probably have to 'pull' it through using a fishtape. As the distance increases, so does the friction against the walls of whatever you are pulling it through. One cannot even pull a piece of romex through 15 feet of PVC without a fishtape and some wirelube from your local electrical supply house. TTUL Gary |
Your going to all that trouble to "protect" 20 feet of coax? It is not
worth the time, hassle or money. Put it down and replace it every couple of years if you think there is a problem. -- Radio K4ia Craig "Buck" Fredericksburg, VA USA FISTS 6702 cc 788 Diamond 64 "yea right" wrote in message ... I would like to bury my coax for a distance of about 20ft. The location consist of 6" of crushed decorative rocks over the top of very rocky soil. I intend to take the LMR-400 coax and push it through a garden hose to add a layer of protection. However, I am worried that condensation will quickly fill the airspace of the hose with water and it will either penetrate the coax outer jacket or interfere with the performance of it in some unknown negative way. I can not flood the garden hose with petroleum oil as it will soon eat through the PVC jacket of the coax or garden hose. Ideally, I would like to flood the hose with the same stuff they put into underground cables. It has a honey consistency and is not easily displaced by water. I was hoping for some type of silicon oil but am unable to find anything similar at the hardware store. Anybody have any suggestions? |
Gary:
Maybe I've been lucky, but I've had no difficulty in pushing RG-8 through a 20 foot section of 1" PVC, and on a good day, have even got RG6 (tv cable) through one that didn't have any other wires in it. Pushing 12-2 w/ground or 14-2 w/ground romex through a similar distance isn't a big deal unless you've got corners to deal with... Sigh... Your mileage may vary, depending upon your patience and luck. By the way, it is much more difficult to push wire uphill than down, or even on the level... Of course, with a really long run, I'd build it up 20 feet at a time, or push a pull-tape through it (or blow a nylon through using air pressure) before pulling a bundle through the PVC. Another possibility is the seamless black flexible pipe. I've been quite successful in pushing a single coax through a 1 1/4" diameter 25' long section of black flexible pipe.... There are lots of possibilities, but for something that is a single coax run of only 20 feet, I might tend towards just direct burial of a good grade of coax and worry about it in a few years. Otherwise, it's probably good to use conduit, even if you have to periodically go out and blow out the "condensation" the original poster was worried about. --Rick AH7H "Gary V. Deutschmann, Sr." wrote: Hi yea right I would use standard PVC conduit and boxes, it's cheaper than garden hose and more impervious to cuts. I doubt if your going to be able to 'push' a coax through a hose, or even conduit for that matter. You will probably have to 'pull' it through using a fishtape. As the distance increases, so does the friction against the walls of whatever you are pulling it through. One cannot even pull a piece of romex through 15 feet of PVC without a fishtape and some wirelube from your local electrical supply house. TTUL Gary |
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