The same techniques can be used on various sized cables. Step 1 — Spool out your length of cable Pull out enough cable to run the length required for your installation. Make sure the ends are cut flush. Step 2 — Strip cable to center conductor Insert the cable into the stripper cavity that is designed to remove all layers of the cable except the center conductor.
This cavity is easy to identify as it has a notch for the conductor. In a circular motion rotate the stripper around the coax cable. After a few rotations the dielectric insulator, foil shield, braid and outer jacket should come off with ease. Use the same rotary motion as the previous step to remove the jacket from the cable. You should now have roughly half an inch of cable stripped to these two stages. Step 4 — Fold braided shield back Fold the braided shield over the outer jacket and away from the dielectric insulator.
Step 5 — Insert the cable into the compression connector Use moderate force and push the cable all the way into the connector. An important point to remember when using the crimp method is to select the proper connector for the coax cable you are using. A tight fit on the inner conductor before the crimp is necessary. The proper ratios of ferrule stud ID to cable dielectric OD and ferrule stud OD to ferrule ID is important to avoid a substandard crimp even with proper tools.
Although relatively new to wireless communications, compression connector attachment was developed and predominantly used by the cable TV industry. As with crimp or solder connector attachment, there are pros and cons to compression connector attachment.
Passive Intermodulation PIM is essentially interference caused by unwanted signals mixing in the passive components of a wireless network. Installing low PIM components can avoid this problem. There are three elements to cable assemblies for low PIM performance. The connector and cable must be designed and manufactured to exhibit low PIM performance.
Most braided cables will not qualify as low PIM. The connector to cable connection is the third important element in low PIM performance. The ground connection must be robust, uniform and consistent. Although crimp connectors provide adequate electrical and mechanical performance they generally exhibit poor PIM performance. Specially designed solder connectors will perform well at reducing PIM.
To achieve good grounding, specialty soldering methods and tools are required. High power inductive soldering stations apply concentrated heat to effectively melt and flow the solder without damaging the cable or connector. Due to the large size and power requirements of induction solder equipment; attachment of low PIM solder on connectors in the field is not an option.
Specially designed compression connectors and installation tools for corrugated cables may be used for field installation with good low PIM results.
Crimp vs. Solder vs. First Step is Cable Prep Whichever method is used, the cable must first be carefully prepared and stripped according to installation instructions for the connector. Preferred result of proper cable prep Jacket, braid and dielectric should be stripped at 90 degrees. Materials cannot be damaged or distorted.
Diameter of braid should be less than diameter of the cable jacket. Nonconforming Cable Prep Braid strands must be completely and cleanly stripped to prevent shorting. Nonconforming Cable Prep Any flare on center conductor and braid is acceptable only if it can be twisted back into position prior to assembly. Advantages of Solder Tooling for this method is simple: the main tool is a low-wattage solder iron with an assortment of tips.
Soldering is much more tolerant of non-optimum technique. Disadvantages of Solder It takes more time to terminate than other methods. Nonconforming Result Excess solder flow onto body of pin Excess solder changes contour of pin Electricals will be affected. Crimp-on This fabrication method has always been the workhorse of the industry, and is probably the most frequently used method of terminating coax cable with connectors.
Preferred Crimp Result A properly crimped ferrule will be slightly flared at the mouth. This is called the bell-mouth condition and helps relieve stress on the coax. Advantages of Crimp-on There is no need for soldering; therefore, installation time is reduced. Crimped connections, done correctly, can be superior to soldered connections. Preferred crimp result Equal compression on all 6 crimp surfaces Center contact crimp die positioned within pin step down.
Disadvantages of Crimp-on If done poorly, the crimped contact will not seat properly within the connector taking the interface out of specification. Nonconforming Crimp Result Position of crimp die is outside crimp area Body of pin is no longer concentric Impedance of connector will be adversely affected. It is less problem on ferrule than contact but far better to avoid with proper tools and technique. Compression Although relatively new to wireless communications, compression connector attachment was developed and predominantly used by the cable TV industry.
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