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The HP JD905A is a 6-inch adapter cable that converts an R-SMA (reverse-polarity SMA) connection to a standard SMA connection. It is a small, passive part, so it adds no gain or electronics of its own; it simply lets two mismatched antenna connectors mate. It suits owners of older HP wireless access points and radios that use R-SMA antenna ports and want to attach standard SMA antennas or pigtails. Compared with generic R-SMA-to-SMA jumpers, it is a branded HP part with a known fit, but it is a single short cable with no extra features.
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The HP JD905A is an antenna cable adapter. It is a 6-inch adapter for R-SMA and SMA antennas.