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Attention: RC-CAM.com will be closing down August 2021.

The RC-Cam.com forum was the very first online community dedicated to the advancement of wireless video cameras on radio controlled (R/C) models. This is now called "FPV" (First Person View). We are proud of the contributions that our members have made to the FPV hobby.

We've seen significant changes over the last twenty years. Initially there were a lot of eager R/C hobbyist that built their own video systems. Allowing these creative individuals to share their work was the purpose of this site. Now the FPV market is flooded with low cost systems; Sadly DiY FPV video projects are now rarely discussed.

RC-CAM.com (main site and forum) will be closing down August 2021. This is being announced now (March 2021) so that everyone has time to download any information that is important to them. After the site is shutdown the information will no longer be available here.

We appreciate every member's involvement with advancing the FPV hobby. It is indeed sad to say goodbye to all our online friends. Be safe and stay healthy.

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Hi all,

I'm a tad confused about the de facto standard for SMA connectors on video TX/RXs. What specific type of SMA connector does 2.4GHz video gear usually have? There are some cheap dipoles available at the local electronics store, but they're terminated with a 'reverse SMA connector'. Should reverse SMA be avoided for the sake of compatibility?



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A reverse coupler would be like your car having a + ground system. A normal SMA connector has the center wire as the signal and the threaded part is the ground or reflector. Avoid a reversed SMA antenna.

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Im not sure if I fully understand your question but all the 2.4ghz units I have used over the years have the same type of SMA connector. Could you post some pictures ?

As for the dipoles, I make my own and surgest you give it a try. I have tested a few and the results from some are not very good so you have nothing to loose.


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In the connector world, there are a couple of SMA designations.

Specifically, RPSMA (reverse polarity SMA) consists of the pins being swapped in the male/female SMA housings. These connectors are considered non-standard and used on devices where the FCC or other regulating agencies do not want antennas swapped out easily.

Simply put, an RPSMA connector will not mate electrically with an SMA. Either, parts will be in the way, or they will screw together and not make electrical contact.


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