Re: [Paparazzi-devel] digital video link anyone?

[Gerard Toonstra]

Rotomotion uses a board similar to that. They also have a full-blown hub and wifi tx onboard and these are on gasser choppers.

How far did you go with digital video and what do you consider long range? 

I worked on a setup and ground decoder to minimize latency. Unfortunately the wing loading turned out to be unfavourable,
so it never flew very far, only about 100 meters. I was working with an arecont IP cam, a 3-pos "CyberData POS router board" powered by 5V,
sparkfun ethernet breakout board (W5100) and Ubiquiti Long Range wifi modules. The UBNT PicoStation can be taken apart to keep weight 
down. I was using a Circular Wireless SPW antenna with Luxul CP 11dBi antenna.  I have not been able to find reasonable alternatives for
wifi that allows transmission of both video and custom data on the same link. So if you know of any, would be happy to hear about it.

The W5100 chip is quite crappy to write data to. Every byte of data requires the transfer of 4 bytes in total over SPI.

Rgds,

Gerard

On Fri, May 10, 2013 at 4:42 PM, Chris <address@hidden> wrote:

I am on a quest for an affordable digital video link so i can pass both telemetry and video from a single link.
So far i have found a board that can do that but i am still waiting for more information from the vendor
as i can't locate the price or availability of it .
http://www.globalismp.com/product/detail/Video_encoder_module/AMU-9111
I have also found this but i don't know the video quality of it
http://www.vfmstore.com/trd01124.htm
I would like to ask anyone that might know if there is something in this world that can stream
video from an analog camera and also provide a transparent serial link without having to resort to the usual ip cameras+serial to ip+wifi bridge setup.
I have succeded in using an ip camera to get video but despite it's problems the analog video tx
(vtx) is still the way to go for long range.
Btw my analog video link reached great distances with a 13db onboard steerable yagi
and i am also testing a dual 180+ degree radiation antenna setup (one on each wing tip and an rf switch to change antenna depending on where home is) copied from a million+ 5m uav.
This approach enables the usage of very high rf power since radiation on the plane's body is at least 25db down and continuous video transmittion.
Chris



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