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"RP-SMA" stands for "Reverse-Polarity Sub-Minature type A". RP-SMA
Connectors [1] are the cousins of SMA-Connectors [2], and provide
identical performance.
Reverse-Polarity connectors differ only by the gender of their center
contact. For example, a male plug has a female center contact.
Reverse-Polarity connectors are commonly used on 802.11 [3] gear due
to America's FCC [4] requirements (Part 15.203) where by such
equipment needs non-standard connectors. Although less common, other
modified SMA [5] solutions to satisfy the FCC [6] requirements are to
either use "reverse-thread [7]" or "shrouded [8]" connectors.
RP-SMA is sometimes referred to as "RG-SMA" - "Reverse _Gender_ SMA"
Links:
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[1] http://melbournewireless.org.au/?RPSMAConnector
[2] http://melbournewireless.org.au/?SMAConnector
[3] http://melbournewireless.org.au/?802.11
[4] http://melbournewireless.org.au/?FCC
[5] http://melbournewireless.org.au/?SMAConnector
[6] http://melbournewireless.org.au/?FCC
[7] http://melbournewireless.org.au/?RTSMAConnector
[8] http://melbournewireless.org.au/?ShroudedSMAConnector
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