Anyone knows of a device that can send an HDMI signal to the ground. Most up to date DSLR cameras now have a HDMI output and not an AV output anymore. One can use a converter to change the HDMI to AV but that adds another 220 grams of weight and the AV signal is not very good.

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Thanks Hai

Altough I think the price would be out of most people's reach, this downlink probably cost less than a 100 dollars to maufacture,

Yes i totally agree. If is it just to preview what the camera see, then adding a cctv camera set to closely match the DSLR view is a cheap alternative.

I think then it would be easier to convert HDMI signal to AV. Problem still not solved!

There are HDMI Senders on ebB*y for about 1/10 the price of the Teradek. 

For example: HDMI Sender / Receiver

There is also a direct-to-PC version: HDMI Sender / PC Stick

Unfortunately, I know nothing further about them.

Looks like a nice device for the home but the operating distance is only about 30 metres.

Yes, that's a bit feeble.  Says output is 12 dBm or about 15 mW.

Perhaps they'd be hackable for the installation of a better, external antenna?

I'm not very good at hacking things, prefer buying an off the shelf item that works.

What about this and then feed the A/V into a standard FPV transmitter?

According to someone in the MK forums, it runs on 5V, and if you remove the unneeded connectors and box, it should be about 50 gr..

I don´t have one myself, but at that price it might be worth taking the risk....

What is the purpose of sending HDMI signal to the ground? Is it just for camera sighting, or do you want realtime HD (I didn't think most DSLRs supported live HD monitoring) video monitoring? If it's just to control what your camera is pointing at, just use a cheap FPV setup that includes a tiny camera that weighs nothing like the $70US unit below. Several professional camera gimbals have these mounted on the side of the gimbal so they can support any camera the copter can lift.

http://www.hobbyking.com/hobbyking/store/__21327__900MHZ_200mW_Tx_R...

if you're looking to get HD video to the ground then teradek is pretty much one of the very few choices which will give you (almost true) HD on the ground..

i have been experimenting with teradek, got 140m solid 720/30p video. in fact, my intentions are to use teradek's as a high quality video downlink for tv broadcasting solutions (news channels etc).. obviously, teradek would never work for fpv (delay is huge)

if you will find anything better for smaller price - please share :)

thx,
jk

@Jaan,

I've been thinking of getting the Teradek for aerial photography from my octo.  I'm finding that with analog, at close range (50m) but at 80m altitude I'm getting serve drop outs.

Rock solid at 140m would be great, is the delay noticeable? do you think it would be a big deal to use aerial still photos?  The onboard camera would shoot, its just using the video link to determine when to press the shutter.

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