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Home✈️AircraftMulti-Rotore-Multi-Rotor Main DiscussionOther › HD FPV in 2019 - Let’s talk about HD & FPV tech
11-17-2019 02:08 PM  19 days ago
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TerenceChan

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Singapore

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HD FPV in 2019 - Let’s talk about HD & FPV tech
Since this is also a thread for people looking to start FPV flying as a hobby, I should probably share my findings on the DJI FPV digital system first because it is a very popular choice for High Definition First Person View(HD-FPV) flying . For starters, DJI HD FPV system is available since Sept 2019, it is such a great product, other than (IMO,) the 5.8g radiation of up to 1W fired by the goggles to the user’s head at point blank when the goggles are set to FCC mode. In CE mode, the goggles transmit at a low power 0.25W which makes it less of a concern for most Europeans whom under the law, could only use 25mw for 5.8g anyway. At this point, you would probably be asking, “Are you mistaken? Only the transmitter emits radiation, the receiver in FPV goggles only receives video signal so the goggles have no radiation!”
Well, first of all, indeed all other fpv goggles only receive video signal. However, the receiver in our goggles still produces radiation because most receiver modules have some sort of an LNA (low noise amplifier) in-built. I know there are LNA units by Mini-Circuits for amplifying the received 5.8ghz signal and you put that between your goggles antenna and the goggles’ SMA. They work just like the usb-powered booster which comes with most HD TV antenna. The inbuilt amplifier is different as it is an essential component in the receiver module itself to ensure rated specs such as > 92% sensitivity or >97% sensitivity for expensive receiver such as the ClearView unit. This radiation is very little as compared to 700mw to 1w of power transmitted by DJI goggles (again in FCC mode).

Yes, the goggles use 2 of its 4 antennas to transmit the receiver signal strength info to the DJI digital video transmitter (HD VTx), also known as the DJI air-module so that the air-module knows exactly how much data bitrate it needs to drop for its transmission to minimize latency issues at times of poor video reception. This translates to “more-blocky” video in terms of the video degradation instead of displaying freeze frames (as in the Connex HD FPV system). This tech is amazing.

Having said this, I personally think that the HD system by Fatshark called “Byte Frost” is pretty neat too. It almost eliminates the latency issue entirely with a different technique, more pixels in the received video are simply turned into snow artifacts as the video reception gets poorer. Hence, you see breakups which are similar to analog FPV video except that the snow bits look kinda squarish rather than grainy. All right, that’s enough of my rambling, here’s the video comparing the dji HD system against the old connex HD system.

Watch at YouTube

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11-17-2019 02:11 PM  19 days ago
TerenceChan

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Singapore

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Here’s my findings with the Fatshark HD FPV system! As you can see, the Byte Frost is no slouch!

Watch at YouTube

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11-26-2019 01:47 PM  10 days ago
Darren Lee

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Woodstock, GA

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I've been flying the DJI FPV system for a couple months now. Love it!

Team Synergy / Rail Blades / Morgan Fuel
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11-26-2019 11:05 PM  9 days ago
skew

rrVeteran

KY

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TerenceChan Here’s my findings with the Fatshark HD FPV system! As you can see, the Byte Frost is no slouch!
Obviously you have not flown with the DJI's! I am no means a DJI fan boy but after flying them for a few weeks Fat Shark better go back to the drawing board because your still watching a worn out VHS tape compared to the experience with the DJI HD
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11-27-2019 01:22 AM  9 days ago
TerenceChan

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Singapore

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Darren Lee I've been flying the DJI FPV system for a couple months now. Love it!

Thanks for dropping by Darren.
I am very impressed with the DJI system too. I like exploring different HD tech so I bought the fatshark’s system since my buddy already has the DJI.
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11-27-2019 02:14 AM  9 days ago
TerenceChan

rrNovice

Singapore

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skew Obviously you have not flown with the DJI's! I am no means a DJI fan boy but after flying them for a few weeks Fat Shark better go back to the drawing board because your still watching a worn out VHS tape compared to the experience with the DJI HD
I had flown my Buddy’s DJI Digital HD before I bought the ByteFrost. My first thought when he handed me the goggles was, “hey this is extremely light-weight for a vr-looking pair of goggles!” After I put it on, I said “Wow, the screen is almost as big as my Oculus2 VR but I can’t see any screen lines or pixels like on my Oculus!” In terms of the HD experience, it was not a jaw-dropping experience for me because I was already enjoying HD on the Connex and a pair of cinemizers. Being able to see every blade of grass and that FPV experience as if you are watching “Discovery” channel on HDTV are not new to me. However, the transition from a small HD screen of my Cinemizers to the DJI one that is almost double in size while preserving every bit of clarity, is certainly very pleasing. In fact, the only issue I had, was getting motion sickness after 5mins. The big display actually made the “fish eye” effect more pronounced even though I knew that FOV of the DJI HD camera was definitely not wider than the 1grams camera (170deg) on my mini whoop.

I agree that the ByteFrost quality is not as clear as the DJI, but it is certainly not VHS tape. I will be honest, the DVR of the ByteFrost does a bad job in recording the live footage, and that degraded-quality recording got worse after uploaded to YouTube. A more realistic analogy for ByteFrost would be DVD quality as compared to VHS/VCD for the analog FPV.

To see the true quality of ByteFrost, I would suggest everyone to watch this clip below which the owner took the trouble to record with external DVR and also rendered the video’s encoding/properties to match the YT’s compression to show a more accurate representation of the real-life HD experience of the ByteFrost.

Watch at YouTube

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11-27-2019 11:22 AM  9 days ago
TerenceChan

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Singapore

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One more video that looks pretty impressive

Watch at YouTube

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11-30-2019 09:08 AM  6 days ago
TerenceChan

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Singapore

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Faster recovery for ByteFrost’s HD transmission
Demo of faster video recovery from full “static” after firmware update

Watch at YouTube

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12-04-2019 10:30 AM  2 days ago
TerenceChan

rrNovice

Singapore

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Finally, for the DJI FPV digital, it is possible to set Betaflight OSD

Watch at YouTube

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