Live Chat
  • One stop service: solve all your problems
  • Orders Tracking and shipped out notification
  • More campaigns, even more discounts!
  • Need help before making an order?
  • Chat with us in real-time.
  • For Aftersale issues, just submit a ticket. We will reply within 24 hours.
  • Multi-language service
  • 24/7 support available
Hi! Log Out Log In SIGN UP
Home > How To > Be an RC god | Understanding FPV connectors: SMA vs RP-SMA
Be an RC god | Understanding FPV connectors: SMA vs RP-SMA

Be an RC god | Understanding FPV connectors: SMA vs RP-SMA

By  GB Blog Official 2017-11-02 40933 3

When you're buying or upgrading a new antenna, transmitter or receiver system for your FPV gear, it's useful to distinguish between SMA and RP-SMA connectors.

This guide will tell you how to quickly tell the difference.

SMA vs RP-SMA Connectors

Historically, the differences were as follows:

SMA (Sub-Miniature Version A): connectors were developed in the 1960s and it's coaxial RF connectors.

RP-SMA (Reverse Polarity SMA) is a variation of the SMA connector specification which reverses the gender of the interface.

SMA vs RP-SMA Connectors

Antenna connectors used for WiFi devices were SMA and TNC connectors for decades. The problem was that both SMA and TNC were readily available on the market in the form of coaxial cable assemblies and antennas.

To prevent users from equipping their wireless routers with such accessories, the FCC mandated that WiFi manufacturers utilize a new type of connector on the back of their devices, so the manufacturers create an irreplaceable connector.

They simply swapped the center pin and hole location between the male and female connectors. So the term actually refers to this hardware "gender" change.

Illustrating the design difference

From the picture, we can see the differences are in:

● the contact body

● inner pin contact

Differences of SMA vs RP-SMA Connectors

A male RP-SMA connector has a male contact body and a female inner pin contact. A female RP-SMA is the opposite in both respects-female body (inside threads) with a male inner sleeve contact.

Similarly, a male SMA connector has a male contact body and a male inner hole sleeve contact, and the female SMA is the exact opposite.

The above can be summarized more clearly in the following table:

summarize SMA vs RP-SMA Connectors


For the purpose of this article, the featured image(s) were sourced from the internet. For any issue, please contact us, and we will deal with the matter promptly.


Easy get 60 FREE points from Gearbest

Prev article:Mastering drones | get maximum control with your transmitter

Next article:Health guide | 5 essential tips for runners

You might also like:

What is GPS and How do use it?
2018-05-26 By Brielle Wilson
What is an RC quadcopter?
2018-06-30 By Sophia Windsor
The application of quadcopters
2018-06-30 By Sophia Windsor