Differences of SMA and RP-SMA Connector

2017/6/15 12:22:19 replies views Category: RF Connectors

SMA and RP-SMA connectors are widely used in FPV transmitter and receiver systems, it’s important to understand the differences. The gender of SMA and RP-SMA connectors are just as confusing.

Some people find it difficult to get their heads around the different types. Even manufacturers could sometimes get it wrong.

Differences of RP-SMA and SMA Antenna Connectors

SMA stands for Sub-Miniature Version A. These are coaxial RF connectors developed in the 1960s.

RP-SMA stands for Reverse Polarity SMA). It is a variation of the SMA connector which reverses the gender of the interface.

There is no difference with video/signal quality between these connectors, but you’ll read further down why we even have these 2 different types. Generally speaking, SMA appears to be more popular choice of connector especially in the mini quad (racing drone) industry.

Here is a comparison table of the SMA antenna and RP-SMA antenna connectors.

For most of us, it would take some time to get to know which was which off the top of our heads. For those who are still getting used to remembering them, an SMA antenna basically has the pin in the middle while the RP-SMA antenna is the exact opposite with a small hole in the centre. It’s not that hard so I’m not coming up with a nursery rhyme to remember it like some others do. :-)


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