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Home✈️AircraftMulti-Rotore-Multi-Rotor Main DiscussionOther › HD FPV in 2019 - Let’s talk about HD & FPV tech
06-03-2020 02:25 PM  10 months ago
TerenceChan

rrApprentice

Singapore

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Beam-forming for FPV drones
The phase shift antenna arrays are used everywhere for RF tracking, except in our FPV hobby, which is a shame. It’s just like the way the “common” smartphone we use everyday, whose technology, if used for this hobby, would outperform most FPV recreational electronics in terms of speed, form factor and resilience. Anyway, for short, I started building my own FPV beamforming antenna about a year ago and this tiring project is finally coming to fruition. It works very well, not extremely well, but I'm really glad I could go that far. Hopefully it will be a proof of concept to bring the big players like VAS, TrueRC, ImersionRC to develop this type of modern tracking antenna.

Watch at YouTube

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08-17-2020 09:06 AM  8 months ago
TerenceChan

rrApprentice

Singapore

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Now that the restriction is lifted, I have had the chance to test my DIY Beam-forming FPV antenna outside. I mounted it on my DJI goggles to get rid of the monitor screen that I had used for testing the antenna's beam steering function previously. It works but there's a lot of room for improvement.

I had written the codes (Arduino) for the antenna array to start sweeping (activate beam-steering fr left to right continuously) only when the signal is noticeably weak (70% snow) and in theory, it would settle for the direction with the strongest signal.

However, in the real world test (in the video below), when I flew the drone to the area behind a big tree on my right, the Arduino codes initiated a sweep immediately as the signal had fallen below the threshold value (of 70% snow). It did find the direction of the strongest signal and settled for that final beam direction.

Unfortunately, since the signal had been blocked by the tree, the received signal strength was still well below the threshold value and the codes initated a sweep again. This would repeat several times for as long as the drone was still behind the tree. Basically the sweeping would not stop until the received signal strength got above the threshold value. And during that time, whenever the beam was steered away from the direction of the drone in that continuous sweeping state, the FPV video reception suffered. Hence, FPV experience was actually worse than that of a 3-way diversity system in that scenario.

On the other hand, if there are no trees blocking the drone's video signal, then the beam steering would work great as the antenna will automatically steer its beam to where the drone is.

Watch at YouTube

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10-12-2020 05:38 AM  6 months ago
TerenceChan

rrApprentice

Singapore

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5db Omni Antenna for DJI Digital FPV
After using 4 biquads on my DJI Digital Goggles for a while, I decided to swap the top 2 biquads with omni-directional antennas for better video in a bando environment. However, this also resulted in less video range in an open area. I started looking for higher gain linear Omni antennas and to my delight, a company called Maple Wireless actually made 5db linear Omni antennas with RP-SMA plug, for connecting to the DJI digital goggles.
Here’s a signal strength test I did, in comparison with a normal 2DB rubber ducky antenna:

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01-28-2021 04:36 AM  77 days ago
TerenceChan

rrApprentice

Singapore

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2021 now, let’s try antenna tracker
Here is an interesting attempt of mine to use an analog antenna tracker (designed by ibcrazy) on the DJI Digital FPV drone..

Watch at YouTube

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03-01-2021 10:11 AM  45 days ago
TerenceChan

rrApprentice

Singapore

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Clone of VAS Pepperbox or TrueRC X²-AIR Antenna
Recently, Maple-wireless (a China company) had been gaining traction in this hobby with their 5.8ghz antennas. Their latest one caught my attention as it looks like an array of 2 patches in a vertical layout. They called it the “Leaf Antenna” and the specs look promising (on paper). I bought one to try it out and it exceeded my expectations although its performance is not nearly as good as the VAS pepperbox or TrueRC X²-AIR Antenna.

Watch at YouTube

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04-01-2021 05:20 AM  14 days ago
TerenceChan

rrApprentice

Singapore

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I have a cheap long range 2.4g transmitter for FPV
There has been so much hype on the new Jumper T-lite transmitter. Since my DX7 died, I grabbed a T-Lite and what’s next? To fly FPV, I modified it for long range.

Watch at YouTube

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