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Power filtering and general advice for an istallation with 2 cameras and 2 vtxs
#1
Hello!

this is my first post, so greetings to the intofpv community!

I have a question about my installation for two independent FPV cameras. I'll put in bullet points to make it clearer
  • I have two cameras: a small Runcam (runs on 12V power via micro JST) and a GoPro (5V power via USB). The GoPro MUST be getting power from this system, and NOT from its own battery (long story, but it has to be that way)
  • each camera has a vtx (TS832 http://www.helipal.com/boscam-5-8ghz-fpv...600mw.html)
  • they sit on a Walkera G-3S gimbal (runs on 12V) controlled by Walkera RX701 TX (also runs on 5V) (just for controlling the gimbal, so only one channel is used)
  • it will all be powered by a single Turnigy 11,1V, 2,65 Ah lipo
So everything that works on 12V is connecter in parallel to the lipo. So the Runcam, both vtxs and the G-3S (all + and - cables of those items are soldered point to point to the + and - of the battery)

To get 5V to the RX701 and the GoPro i have 5V UBECs, one for each. The UBEC for the rx is between the battery and the rx. The UBEC for the GoPro is between the VTX and the GoPro, because the TS832 has power output for the camera along with the signal. I actually tried getting the power for the GoPro without it going through the vtx, but for some reason it didn't work.

So the questions are:
  1. I have two power filters like those:[Image: Filtr-Zasilania-LC-FILTER-AV-FPV-LC-VTX-...%99cia.jpg]Where should I put them? I see several options:
    1. a) between the battery and the vtx; b) in case of GoPro - between the vtx and UBEC; c) in case of GoPro - between the UBEC and the camera; d) in case of Runcam - between the camera and the battery.
  2. Is there anything alse I can do to improve this system? Does something here not make sense or you would consider it a mistake?
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#2
Welcome to the forum!

I'm puzzled by what you are trying to achieve with two video sources. You don't say what kind of Runcam you are talking about, but if the Runcam is a real FPV camera, it will have much less latency than the GoPro, so the two video feeds won't be in any particular sync.

If you need them (and you'll only know once you try it), the LC filters should be placed between the source of interference and the thing you want to protect from interference. Depending on the current rating of the filters, you may only need one placed between the battery and the video system components.

What exactly are you building here? I can't imagine the Walkera gimbal working with anything else than the GoPro on it.
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#3
I'm assuming you want the 2nd vtx system so you can see what you are actually view what you're filming with the GP. But that's a pretty complicated system, this would be a better way
http://www.ebay.ca/itm/DJI-F550-FPV-Vide...2503833303
[-] The following 2 users Like RENOV8R's post:
  • sloscotty, unseen
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#4
Brilliant suggestion!

I'm still not convinced about mounting both the GoPro and a Runcam FPV camera together on the same gimbal...
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#5
I agree, FPV cam should be mounted stationary. Monsieur Calzone, would you be able to post some pics of your setup?
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#6
Thanks for your replies. As for what I'm trying to achieve, I wanted to see (using equipment I already have) how would stereoscopic vision work with an aerial view. Just an experiment. I know two different cameras might not be optimal for this, but as I said, for now I'm just trying to use what I already have.

As for the Runcam, it's a 650TVL Runcam Sky.

And yes, the walkera gimbals are definitely not great, but G-3S can manage two cameras like this pretty much no problem, as it was designed for one bigger camera, Sony RX100.

As for the LC placement, I've completed the installation, and have plugged in all the elements (except gimbal) to one battery and it works, although I am getting some stripes on both cameras (nothing too bad). Weird thing is, that when those cameras were plugged in separately (just one camera and one vtx at a time + the ubec in case of GoPro) they had the same stripes. So not sure what is the source of the interference...
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#7
Interesting concept. But as you said, may be tricky with 2 different cameras. I'm assuming that there must be some type of software to "stitch" the 2 videos together? Sort of like panorama feature on a camera? I know you want to do this with what you have, but as you referenced "stereoscopic" I guess you're aware of the NerdCam. I know it's not cheap but it would make things a whole lot simpler for you.

http://www.getfpv.com/nerdcam3d-mk-2-ste...amera.html
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#8
(13-Jun-2017, 09:37 AM)DroneCalzone Wrote: Thanks for your replies. As for what I'm trying to achieve, I wanted to see (using equipment I already have) how would stereoscopic vision work with an aerial view. Just an experiment. I know two different cameras might not be optimal for this, but as I said, for now I'm just trying to use what I already have.

As for the Runcam, it's a 650TVL Runcam Sky.

And yes, the walkera gimbals are definitely not great, but G-3S can manage two cameras like this pretty much no problem, as it was designed for one bigger camera, Sony RX100.

As for the LC placement, I've completed the installation, and have plugged in all the elements (except gimbal) to one battery and it works, although I am getting some stripes on both cameras (nothing too bad). Weird thing is, that when those cameras were plugged in separately (just one camera and one vtx at a time + the ubec in case of GoPro) they had the same stripes. So not sure what is the source of the interference...

You must have identical cameras for stereoscopic FPV to work. If the cameras have even slightly different fields of view or latency, there will be no illusion of 3D whatsoever.

You also need goggles that support receiving two channels and displaying one for each eye.

I have the Skyzone Sky02S goggles which are prepared for exactly this. You can set the goggles to 3D mode and they will then set the diversity receivers to two different video channels and display one channel on each eye. The goggles also come with a pair of identical cameras in a housing that separates them by about 50mm and a dual channel video transmitter with two inputs and two antenna connections.

I haven't had time to try the 3D video feature yet, but from what I've read and watched, the 3D effect is only really noticeable when you are flying fairly close to objects. As soon as the distance between the craft and the scenery exceeds about five metres, there isn't enough difference between each eye to trick your brain any more. My gut feeling is that the relatively small distance between the two cameras is part of the problem. If the distance between them is less than the normal distance between your eyes, the 3D effect is bound to be compromised. Then, the limited resolution of the video signal makes it even harder for your brain to detect the differences between each eye's view. I'm not sure what the field of view the stereo cameras have, but I can imagine that if the FOV is smaller than your 100° vertical and 200° horizontal FOV when using both eyes, this will also present a problem in tricking your brain into forming a truly 3D view.

If you are getting interference which is not dependent on the camera being used, then most likely, you are picking up the interference in the wires from the camera to the video transmitter or in the power feed to the video transmitter. You must take care to keep all video related wires as far away from other electronics as possible, especially from the PDB, ESCs and any switched mode voltage regulators.

Some photos of how you have routed all the wires and connected things together would allow us to make less general suggestions about what you could do to solve the interference problems.

In the end though, unless you have a way to display one camera on each eye and have identical cameras, you won't achieve anything remotely like 3D. You might discover a new way to make people throw up though! Big Grin
[-] The following 3 users Like unseen's post:
  • Drone0fPrey, Tom BD Bad, RENOV8R
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