FPV wiring: 5V camera, 12V VTx

[nek]

Hello everyone,

I looked around but could not find a clear answer to my question...

I have a GoPro with cables soldered to the +5V USB, GND and Video out on a connector out the back of the waterproof case.

My whole FPV system is on a single ground "spider" from my LC filter and my 3S LiPo supplies the VTx and the cheapo HKing OSD this way. My VTx is an ImmersionRC 5.8GHz but I can't use it's 5V output to charge my GoPro as it draws close to 900mA while filming and charging and the IRC VTx can't handle that.

If I don't connect the +5V of the GoPro and run it on it's internal batteries I get a good picture but my OSD is flickering a little bit... Do I need to add a 75ohm resistor on the video wire right as it exits the GoPro?

Now if I connect the +5V of the GoPro to a BEC that get's it's input voltage from my LC filter, just like the VTx and OSD then I get a slightly worse image and the OSD is flickering to the point of being a sideways blur...

Any help please?

Thanks!

[YooDoG]

This guy has an interesting point people... Sorry Nek, I don't have the answer, but the problem is clear and might appear for many of us. Can some help?

[JBeloncik]

A diagram will help people help you. It wasnt clear to me if you did this already, but one thing you might try is connecting the gopro +5v and GND to the BEC. Now connect ONLY the video from the gopro to the vtx.

[HeliShredder]

Did you try putting an LC filter after the BEC?

[YooDoG]

Precisely, I think LC has to be after BEC, not before. At least on mine UBEC it is preinstalled after)

[Luris]

How about using a hacked Usb Car charger?
like this one http://www.ebay.com/itm/Belkin-Mini-...3706%26ps%3D54

I have one in my GS that i can charge my gopro or phone from. that works fine. For use in Plane/multirotor you could draw power to this from the balanced plug of the battery. it gives 5v and 1amp so it can handle the Gopro. it may work