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Common-sense cabling

Lack of foresight can push designers into using cable assemblies that garble signals or are unnecessarily expensive. Lengths of cable terminated with SMA connectors have been phase-matched to provide electrical lengths that are identical. Phase matching does not involve cutting cables to identical physical lengths. Variations in cable dielectric material necessitate use of network analyzers to trim cables for identical standing wave relationships. The semirigid cable on these N-style connectors provides the best EMI shielding of any coax. Supersmall MCX connectors handle much smaller cables than ordinary DIN connectors (left). Problems arise when designers try to mate large cables with small connectors and vice versa. The center pin of the connector has a diameter different from that of the cable center conductor, resulting in signal-reflection losses. Right-angle and straightsweep SMA connectors work well on RG-316 cable, but rightangled versions cost more. Use them only when conditions demand it. OnlineCables.com contains tools that permit users to design cable assemblies. Site users can configure and quote parts, specify labeling with part numbers from their own company, as well as download appropriate drawings. Among design engineers, electrical cables get no respect. They are frequently an afterthought, being among the last items specified during a development effort. This practice can cause difficulties on a variety of levels. Budgets for signal levels are often used up by the time cabling gets considered. There is no such thing as zero-loss cable to bail out engineers who find themselves in such predicaments. Nor is there zero-dollar cable for economically challenged projects. And going with the leastcostly cable/connector assembly exposes the unwary to a special set of land mines. A few war
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