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Old May 05, 2014, 09:02 PM
DJI SUPPORT / TESTING
blade strike's Avatar
United States, CA, Big Bear
Joined Jan 2006
11,815 Posts
New Product
DJI LightBridge 2.4G Full HD digital video downlink **Owners Thread**


2.4G Full HD digital transmission
- Digital video transmission, input supports up to 1920 * 1080 @ 60fps , output up to 1920 * 1080 @ 30fps ;

· Distance
- Use 2.4G RF technology, transmitting power 100mw (CE and FCC certification);
- •Up to 1.7 km (1.05 miles) long distance transmission;
- Ground terminal with 14dbi directional antenna (optional), measured the effective transmission distance up to 5km (3.1mile);

• Multiple video input and output formats
- AV input;
- HDMI input;
- USB 2.0 Full HD video output: IOS, Android and other mobile phones, tablet PCs do monitor via USB connection using;
- HDMI HD video output;

· Built-in remote link
- Downlink and uplink remote video link system while working at 2.4Ghz;
- Ground terminal via remote control coach to get the remote control port data sent to the client through the sky uplink, downlink synchronization with the video link, without disturbing each other;
- Ground terminal controller supports two simultaneous input Lu Yao, were used as aircraft control and PTZ control, the sky receives transmitted to the master via DBUS;

• Immunity
- Uplink frequency hopping (FHSS) + Spread Spectrum (DSSS) technology, high transmission stability, strong anti-jamming capability;
- Downlink MIMO multiple antenna technology and using OFDM modulation, with advanced algorithms to effectively improve the stability of the system data bandwidth and complex environment, improve the dynamic performance of the system;
- Real-time monitoring of each downlink channel interference state, dynamically select the best channel operation (up to 8 image transmission channels);
- Same time and can support up to eight devices simultaneously sets Lightbridge;


•System latency of approximately 150ms;


• OSD function
- Built-in OSD function, with NAZAV2, WKM, A2 use when no external IOSD, information overlay function can be realized;

• Bundled flight controllers
- Equipment must NAZA V2, WKM, A2 used in conjunction with the master.

• Multi-slave mode and Information Security
- End single sky and simultaneously work with multiple ground terminal (only one ground terminal to transmit control data, the device can only receive the rest of the video);
- Data encryption transmission, only after the ground terminal on the frequency authorized to receive video data to ensure information security;

• Large-capacity rechargeable battery and the external
- Built-in 4000mAh high capacity ground terminal battery, the device can work for 4.5 hours;
- Standard charger or 3s-6s battery can be charged, charging only 1.5h;
- Battery power LED visual indication;
- Through the USB external mobile devices, providing the charging function for mobile devices, an external device to extend the use of time;

Second, Specifications
Video Input HDMI, AV, DVSB
Supported formats (HDMI) 720P50; 720P60; 1080I50; 1080I60; 1080P25; 1080P30; 1080P50; 1080P60;
Supported formats (AV) PAL25; NTSC30
RF parameters 2.405 ~ 2.4835GHz, comply with CE, FCC certification
Interface (ground side) LED lights; power switch; charging port; USB 2.0; HDMI; remote control inputs (two Luyao controller input)
Interface (Sky end) LED lights; DBUS; HDMI; AV; DVSB; keys for frequency
Material Aluminum
Power supply (ground terminal) DC power input 11 ~ 26V; built-in lithium battery; Consumption: 6W (no external USB device), 8W (external USB device)
Power (Sky end) DC power input 11 ~ 26V; Power consumption: 8W
Dimensions (ground side) 125 * 89 * 20 (mm)
Dimensions (Sky end) 67 * 47 * 20 (mm)
Weight (ground side) 360g
Weight (Sky end) 70g

DIY Cable diagram (Dealers Should have cables shortly)


I received my production unit last Friday. I was only able to do a test early Saturday morning since we have been having some major winds. I was able to beat my last record of 1900m and got out to 2.3km. I was unable to get any usable footage of the live screen since it was to sunny to film the phone. We now have some weather coming in, so I am grounded until Wednesday at the latest.

I took some quick pictures of the install. First open up the p2 and find the expansion port. This will be the main connection for power and can bus communication. No soldering is required.





The next thing you want to do is remove the stock rx connection. This is not the permanent home for my Lightbridge so I left the stock rx in place and just disconnected the two servo wires. After that all you need to do is connect the d.bus wire to x2 port on the FC.



After that you are done with the inside and can close her back up.






Only thing left to do is connect the power / can bus cable, d.bus cable and antennas to the transceiver.











The radio setup was very simple. You just plug the connector into your trainer port and you are connected to the ground end. I did have to readjust my endpoints for the U channel and I did a radio calibration as well, to be on the safe side.

I will be updating the area below with more videos of mine and other users.

First Test flight with DJI LightBridge ***PIP*** (8 min 30 sec)


DJI Light Bridge 1900+ meters *Long Distance Test 2 PIP* **Preproduction Software and Hardware** (9 min 7 sec)


HDMI Monitor test
DJI LightBridge **OSD Over HDMI** (0 min 49 sec)
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Last edited by blade strike; Jun 09, 2014 at 09:13 PM.
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Old May 05, 2014, 09:44 PM
Registered User
United States, CA, Santa Barbara
Joined Dec 2013
342 Posts
Thanks for this Blade. I'm proud to call myself a LB owner after getting lucky today, but I won't be able to install until I get home on Wednesday. This will come in handy as a reference.
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Old May 05, 2014, 09:48 PM
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GGoodrum's Avatar
South Orange County, CA
Joined Mar 2003
8,185 Posts
Looks interesting, for sure.

Wasn't the price supposed to be $1399? Empire and B&H each list it for $1599.

-- Gary
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Old May 05, 2014, 10:00 PM
DJI SUPPORT / TESTING
blade strike's Avatar
United States, CA, Big Bear
Joined Jan 2006
11,815 Posts
Quote:
Originally Posted by GGoodrum View Post
Looks interesting, for sure.

Wasn't the price supposed to be $1399? Empire and B&H each list it for $1599.

-- Gary
Correct , should be $1399
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Old May 05, 2014, 10:05 PM
DJI SUPPORT / TESTING
blade strike's Avatar
United States, CA, Big Bear
Joined Jan 2006
11,815 Posts
Quote:
Originally Posted by westwood21 View Post
Thanks for this Blade. I'm proud to call myself a LB owner after getting lucky today, but I won't be able to install until I get home on Wednesday. This will come in handy as a reference.
Awesome, let me know if you have any questions.
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Old May 05, 2014, 10:34 PM
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Joined Jan 2009
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Blade, please confirm that the stutters in the HDMI Monitor video are in fact there and not just a problem with my playback, YouTube or your filming. I can clearly see the image freezing every few frames.
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Old May 05, 2014, 11:40 PM
DJI SUPPORT / TESTING
blade strike's Avatar
United States, CA, Big Bear
Joined Jan 2006
11,815 Posts
Quote:
Originally Posted by SamurAchzar View Post
Blade, please confirm that the stutters in the HDMI Monitor video are in fact there and not just a problem with my playback, YouTube or your filming. I can clearly see the image freezing every few frames.
This was on beta software and hardware. I have only had this unit in hands for a few days. I will need to test the hdmi output on the production hardware.
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Old May 08, 2014, 10:43 PM
DJI SUPPORT / TESTING
blade strike's Avatar
United States, CA, Big Bear
Joined Jan 2006
11,815 Posts
I was able to get ok video of the phone today. I hot 2.3km again and realized I have my limits set to 2.3km I think I could have hit 2.4-2.5 if not enabled. I will try again but the winds up here have been terrible!

LightBridge Long Distantce run on ***PRODUCTION HARD-SOFTWARE*** (8 min 9 sec)


**Warning boring video, Long range test only**
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Old May 09, 2014, 02:15 AM
Hardware & software developer
Sweden, Luleĺ
Joined Mar 2014
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Quote:
Originally Posted by blade strike View Post
I was able to get ok video of the phone today. I hot 2.3km again and realized I have my limits set to 2.3km I think I could have hit 2.4-2.5 if not enabled. I will try again but the winds up here have been terrible!
**Warning boring video, Long range test only**
Thank's Blade for your video and congratulations to the longest distance so far !
Not good with high winds when you should test the Equipment - be patient
Keep up the good work !
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Old May 09, 2014, 02:47 AM
Forensic Animation/Video/Photo
vislaw's Avatar
United States, CA, San Jose
Joined Nov 2011
586 Posts
Am I correct to assume the 2.4GHz datalink is a no-go with the LB?

How about the 900MHz ground station datalink?

Also, it has been drilled into me how crappy dipole antennas are. Has anybody experimented with replacing the LB antennas with patch or helicals?
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Old May 09, 2014, 04:57 AM
Hardware & software developer
Sweden, Luleĺ
Joined Mar 2014
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Lightbridge actual latency...

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Old May 09, 2014, 10:00 AM
DJI SUPPORT / TESTING
blade strike's Avatar
United States, CA, Big Bear
Joined Jan 2006
11,815 Posts
Quote:
Originally Posted by vislaw View Post
Am I correct to assume the 2.4GHz datalink is a no-go with the LB?

How about the 900MHz ground station datalink?

Also, it has been drilled into me how crappy dipole antennas are. Has anybody experimented with replacing the LB antennas with patch or helicals?
Correct 2.4 is no go. I will try to find out about the 900mHz data radio.

Haven't tried any other antenna but stock.
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Old May 09, 2014, 10:02 AM
DJI SUPPORT / TESTING
blade strike's Avatar
United States, CA, Big Bear
Joined Jan 2006
11,815 Posts
Quote:
Originally Posted by Lexman View Post
Thank's Blade for your video and congratulations to the longest distance so far !
Not good with high winds when you should test the Equipment - be patient
Keep up the good work !
Thanks man.. really makes me mad that I didn't set my limit further. I know I could have hit 2.4-2.5km
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Old May 09, 2014, 12:11 PM
Smashing Planes since 1982
Tahoe Jmfc's Avatar
United States, CA, Kings Beach
Joined Aug 2007
502 Posts
Here is how I installed my Lightbridge on P2 with H3-3D.
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Old May 09, 2014, 12:13 PM
DJI SUPPORT / TESTING
blade strike's Avatar
United States, CA, Big Bear
Joined Jan 2006
11,815 Posts
Quote:
Originally Posted by Tahoe Jmfc View Post
Here is how I installed my Lightbridge on P2 with H3-3D.
The iOSD isn't connected is it?
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