Update 2018-07-11-Custom-DDL-For-Digital-HD-Video-And-Telemetry.md

Author: glytchtech

_posts/2018-07-11-Custom-DDL-For-Digital-HD-Video-And-Telemetry.md

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-Recently I've been working on and off on a custom DDL (Digital Data Link) for my various drone projects. Requirements were multiple telemetry streams, one for the flight controller and one for any custom payload, as well as  HD digital video. Minimum 1 mile of range, conservatively, and I wanted it to be almost entirely self contained, with only a display device being external. I believe I have accomplished those goals, with this system. 
+Recently I've been working on a custom DDL (Digital Data Link) for my various drone projects. Requirements were multiple telemetry streams, one for the flight controller and one for any custom payload, as well as  HD digital video. Minimum 1 mile of range, conservatively, and I wanted it to be almost entirely self contained, with only a display device being external. I believe I have accomplished those goals, with this system. 
 
 ![Dh2i0-hXcAIcpsN.jpg]({{site.baseurl}}/images/2018/7/Dh2i0-hXcAIcpsN.jpg)
 
-I've chosen to use <a href="https://github.com/seeul8er/DroneBridge"> DroneBridge </a> firmware to build this system. It is an open source implementation of wifibroadcast that provides extra features and a rather slick Android based app. It gives the system a DJI-like interface, with a minimap and OSD with important details. 
+I've chosen to use <a href="https://github.com/seeul8er/DroneBridge"> DroneBridge </a> firmware to build this system. It is an open source implementation of wifibroadcast that provides extra features and a rather slick Android based app, that connects to the DDL over USB tethering or WiFi. It gives the system a DJI-like interface, with a minimap and OSD with important details. 
 
 Wifibroadcast is clever system that uses cheap and readily available wifi cards, but without the traditional wifi protocol. Instead the cards are in monitor mode and injecting packets in a unidirectional manner, giving low latency "analog-like" behavior. It has a graceful fall-off as you get to the edge of your range, dropping frames rather than cutting out entirely. Lower bitrates also allow much greater range than traditional WiFi.