Just to clarify for those looking for a working setup, here is my complete setup for downlink with a Sony NEX5n. (wiring photos for converter at the bottom of post). HUGE thanks to MombasaFlash for helping and posting about this converter hack. Not sure who found it first but thanks to them as well!
Sony NEX5n on a PhotoHigher AV130 on a Flexacopter with WKM
HDMI -> RCA converter available from Amazon here:
ViewHD Universal Mini HDMI to Composite / AV Video Converter
or on Goodluckbuy here:
http://www.goodluckbuy.com/hdv-m610-mini-hdmi-to-cvbs-lr-audio-converter-adapter-scaler-.html
HDMI to mini HDMI cable that I hacked the plastic off of and put heat shrink on so it would fit between the pulley and the camera. Have a slimmer shorter one on the way... one of these:
http://www.hypershop.com/HyperThin-World-s-Thinnest-HDMI-Cable-s/192.htm but can't confirm yet if it will fit without cutting away connector... my guess is no.
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ImmersionRC 600mW 5.8GHz A/V Tx with the 5v out powering the HDMI converter:
http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=40&products_id=266
Powering that with a Zippy 1000mAh 2s Lipo
blue beam cloverleaf and skew planar antennas:
http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_45_49&products_id=550
ImmersionRC Duo5800 A/V Diversity Receiver (overkill but nice):
http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=40&products_id=265
Fatshark Dominator video goggles (sometimes, also use LCD screen depending on situation)
http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_22&products_id=522
Powering these and the receiver with a Zippy 1600mAh 3S Lipo.
Here's how to power/hack the HDMI converter.
Each of the 4 corners has female tabs on the top of the case. Just push into the crack with a spudger or super thin screwdriver to pop the tabs out.
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Then desolder the RCA connectors. This is a pain in the *** I suggest you have a good solder sucker.
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I then soldered a servo lead on like so. 5V to the positive side of the capacitor next to the USB port (the leg closest to the edge of the board). Ground to a leg of the USB shield. And Video to the center pin hole of the video socket, the inner of the two holes. Zip tie for strain relief pop the case back on and pow. Done. IF you don't knock of one of the tiny SM resistors along the way that is. ;-)
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I mounted it to the front of the AV130 with some 3M dual lock velcro, battery backpacking along as well.
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