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What are the coups for installing coaxial cables?

Time:2019-12-10

It is well known that care still needs to be taken when handling coaxial cables, especially when they are pulled out through a conduit. When using a cable clamp, disperse the clamping force by increasing the surface area of the cable being clamped, while limiting the amount of clamping force to avoid deformation of the cable cross section. So, what are the coups for installing coaxial cables?


What are the best ways to install coaxial cables: protective sleeves


When installing coaxial cables, it is important to protect the cable's protective sleeve to prevent water from flowing into the inside of the cable anywhere. First, handle the cables carefully during storage and installation without damaging the protective sleeve. If the protective cover is damaged, you must quickly pay attention to the damage and ensure that water does not enter the cable, and then use the waterproof patch of the RF connector to repair the limited damage.


After it is connected to the antenna, the cable is fixed so that the protective sleeve will not be damaged by actions such as wind or antenna selection. Vertically suspended cables should be supported in such a way that any bending action of the cable is gradual and its bending radius is much larger than the minimum bending radius. The cable clamp used should be clamped on a shorter cable to spread its pressure to avoid damage to the protective sleeve. If you use a metal wire or plastic cable tie, do not tighten it too much to prevent the protective sleeve from being rolled.


An important part of the protective cover is the waterproofness of the RF connector. The braided layer of the coaxial cable exposed to air acts as a core and absorbs moisture. To a lesser extent, cables with stranded center conductors or partially hollow center insulation can also absorb moisture. When water molecules or moisture penetrate the coaxial cable, whether it is in the braid or the center conductor, it quickly becomes unusable due to losses. Discolored or damaged cables are irreparable and should be discarded.


What are the best ways to install coaxial cables: buried coaxial cables


There are a few reasons why you might choose to bury a coaxial cable. One is that buried coaxial cables are almost immune to storms and UV rays, and usually require very little maintenance compared to cables exposed to the air. Another possible reason is that the coaxial cable buried in the ground and the radiation pattern of the antenna produce less interaction, generate less noise interference, and transmit smaller common-mode RF signals on the outer surface of the shield. A buried coaxial cable is aesthetically acceptable to most communities. Although any cable can be buried underground, those cables designed to be buried underground will have a longer life. Buried cables have a layer of high-density polyethylene protection because they are both non-porous and can withstand quite high compression loads. In the impregnated direct buried cable, an extra moisture-proof polyethylene grease is applied under the protective sheath, which allows the material to leak out, thus “curing” the penetration of the small sheath. Both RG-8 / U and RG-312 / U are naturally considered to be directly buried cables-the cable supplier must specify their direct buried rating. Directly buried cable protective sleeves are usually printed with a "direct buried" or equivalent label.


Here are some advice on buried cables.


(1) Because the outer protective cover is the first line of defense of the cable, care must be taken to avoid damaging it during any step, which can maintain the quality of the cable for a long time.


(2) The sand or finely divided soil of the buried cable shall be free of stones, cinder or rubble. If the soil in the trench does not meet the requirements, lay the cable with 4-6 inches of sand in the trench and lay the cable with 6-11 inches of sand. Before filling the trench, place a piece of anti-corrosion or partial pressure wood on the sand, this will provide some protection against damage to the cable due to digging or driving.


(3) Leave a little margin on the cable when laying the cable. Because when the material fills the cable, a tight cable is more easily damaged.


(4) When installing the cable, check the cable to ensure that its protective sleeve is not damaged when stored and dragged over sharp edges.


(5) It is important that the cables buried in the ground be buried below the freezing line to avoid damage to the cables due to expansion and contraction of soil and water during the freeze-thaw cycle.


What are the coups for installing coaxial cables: using pipes


When burying coaxial cables, you may consider using plastic pipes or electrical pipes. Such plastic pipes provide a mechanical barrier, and water penetration is actually guaranteed-water either leaks directly or condenses in the air. Be careful when drilling holes at the bottom of all the lowest points of the pipe. These holes are designed to allow moisture to escape or use perforated pipes so that water can escape to the surrounding floor.


Regardless of whether the pipe is above or below ground, a larger radius pipe should be used instead of a smaller radius pipe. The cable can easily pass through a bend with a large radius, and the cable is easily damaged when passing through a sharp bend. When pulling cables, often using burred metal pipes will strip the cable's protective sleeve. Before assembling each part, the edges should be sanded or lubricated.


When choosing the size of the pipe, leave enough extra space—the diameter should be at least twice the expected total diameter of your cable. It is recommended to have a diameter of 3-4 inches, which greatly simplifies its traction process and gives sufficient space for the cables for connectors and joints to pass through the pipe. Make sure that the end of the traction cable has a "fish line" or "fish line" so that you can continue or replace the cable behind it.


The above is all about the coup for installing coaxial cables. Of course, coaxial cables are not affected by other adjacent conductors, and can operate in metal pipes or on the surface of metal structures.


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