RP-SMA mainly stands for reverse polarity SMA, is the variation of SMA connector specification that reverse the gender interface. The female RP-SMA connectors mainly has a female body contact with a male interior pin contact. While on the other hand male RP-SMA is totally opposite in all respects. A male body has inside threads with inner sleeve contact. As female connectors have a female body contact with a female interior hole sleeve contact, the male RP-SMA is totally opposite of that.
The concept behind the creation of RP-SMA extension was to comply specifically with certain local regulations. The producers had to make all-new non-standard antenna connector for all their WiFi devices, which were hard to find any of their replacements. They did this to prevent their customers from in any way connecting the antennas with gain that will breach compliance. Therefore, the producers had to just swapped the locations of the middle pin and the hole between the female and male connectors.
It is obvious when you are upgrading your antenna for your FPV transmitter or the receiver system the question you are likely to ask yourself is, what the difference between RP-SMA and SMA is. There is a lot of confusion when it comes to the different types of connectors and many people find it difficult to get their head straight around the various types. Sometimes even the manufacturers confuse the two as it has been seen.
It is good for you to know the difference between RP-SMA and SMA, as it will help you in a number of ways. One of the basic difference you should always remember is that SMA (Sub-Miniature Version A) connectors, it is coaxial RF connectors, which was developed in early 1960s. While SMA connectors is mainly just the variation of SMA connector specified to reverse the gender interface and was develop recently.