The mysterious FrSky R9 Mini antenna – good for EU 868MHz?

FrSky R9 radio system is storming the RC hobby. It’s super cheap after all. But there are problems: EU version is facing a lot of problems and people like to replace original antennas with something else.
Last week I was asked to check what is going on with antennas shipped with FrSky R9 Mini. After all, the same hardware can be used both for FCC 915MHz and EU 868MHz version. Is the antenna tuned somewhere in between? Or not so much?

Custom FrSky R9M 868MHz antennas giveaway

As you might have realized, from time to time I’m making an antenna and I have the equipment for it. I’m also strongly considering to produce a small batch of antennas for FrSky R9 long-range radio system since there is a high demand for such antennas.

Custom FrSky R9M dipole antenna

I have made a first small series or FrSky R9M dipoles tuned for the 868MHz EU-LBT version of this radio link and I want to give away 3 of them to my Patrons. If you want one of the 3 antennas:

  1. go to https://www.patreon.com/pawelspychalski and become my patron if you are not one yet
  2. go to Custom FrSky R9M antenna giveaway post and comment with “I want one”
  3. wait one week until 5th of September 2018

On that day I will randomly choose three commenters and send them brand new, custom made 868MHz FrSky R9M antenna.

FCC 915MHz version giveaway will follow, I’m waiting for parts to arrive in a few weeks.

DIY Moxon antenna for TBS Crossfire and FrSky R9M

Moxon antenna in layman terms, it’s probably a simplest linearly polarized directional antenna. It’s like a bent halfwave dipole with a bent reflector in a back. Think about it as a very simplified Yagi antenna. It does not have much gain but has very good backward rejection. And thank’s to a simplicity, Moxon is super easy to build at home. And I’m proud of radio carrying handle snap mount. I think I did a good job over here.

I’ve built mine with some 3D printed parts, 0.8mm copper welding wire, 22cm of RG174 coax and RP-SMA plug. And some glue of course! Result? It’s definitely directional 🙂 I’m not using it very often, but it’s small enough to be taken everywhere where I take my X10S.

Realacc UXII circular polarized 5.8GHz FPV antenna – Lumenier AXII chinesium clone

Cloners gonna clone and chinesium keeps being chinesium! It did not take long for Banggood / Realacc to clone Lumenier AXII FPV antennas and call them Realacc UXII circular polarized FPV antenna. Coincidence? I do not think so.

Realacc UXII circular polarized 5.8GHz FPV antenna

I've ordered few of those in December, they arrived last week and this is what came in package

Realacc UXII circular polarized 5.8GHz FPV antenna

Realacc UXII circular polarized 5.8GHz FPV antenna

Unfortunately, in this case, the build quality was typical chinesium. As soon as I opened one of them, antenna disintegrated… oh bugger…

Realacc UXII circular polarized 5.8GHz FPV antenna

I only hope the other (the one I did not open) works like expected. I did not test them in real life conditions since the weather is rather bad over here. This weekend maybe… In a meantime, here is a video of what is happening inside Realacc UXII 5.8GHz antenna.

Video tutorial: 5.8GHz Inverted Vee antenna for FPV

Today another video tutorial. It’s just simpler to show how to make something on video than with text and images. So, without further ado: How to make Inverted Vee antenna for 5.8GHz FPV at home. All that is required is:

  • coax cable (here RG316)
  • SMA/RP-SMA connector
  • copper welding wire
  • caliper
  • soldering station
  • basic tools

At the end we have small and light FPV antenna that just works. Sometimes it’s just worth to make something by yourself, right?