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Author Topic: ESC noise - but power should already be regulated.  (Read 160 times)

CurryKitten

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ESC noise - but power should already be regulated.
« on: October 10, 2017, 03:59:02 PM »

If anyone saw I did a review of the AKK K2 (it's in the Product reviews sub forum) they will have noticed a lot of video noise I was getting.  I thought I'd got power for my camera through the 5v out of the flight controller and thought that might give some noise out... but having taken it apart what I've actually got installed is a Matek power distribution board which is taking my lipo to give power to the ESCs and also provides a regulated 12v and 5v output.

The 12v is running my VTX and the 5v running my camera.  This was very clean and had zero noise when running on the original SPRacingF3 board, but that failed and I'm running on an Omnibus F4 Pro (although this had a few issues of its own and I've always been slight suspicious of it)

So with both the camera and VTX getting (allegedly) clean power, the only other wire is the video - this goes from the camera to the FC and back out to the VTX (as there's onboard OSD).  So is it likely the FC is introducing noise just on the video line ?  I could just bypass the OSD to find that one out, but thought I'd post here to see if anyone had seen similar.  I could get an LC filter in there, but is that overkill with the regulated PDB as well ?

Coyote

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Re: ESC noise - but power should already be regulated.
« Reply #1 on: October 10, 2017, 05:02:49 PM »

I have flown my 450 with zero interference on my normal Vtx and for my review will be fitting the AKK on there as it's a proven clean video ship.

It will be Friday when I do it though but I will let you know how the AKK fairs.
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English Turbines

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Re: ESC noise - but power should already be regulated.
« Reply #2 on: October 10, 2017, 05:36:10 PM »

My guess is that that Matek PDB is just a regulated 12v and 5v power supply....Not a filter....?

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iwan_canobi

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Re: ESC noise - but power should already be regulated.
« Reply #3 on: October 11, 2017, 12:43:32 PM »

I've had no end of issues with noise killing the OSD on my Omnibus F3 board, I have a similar setup where only the video is connected as I have a separate 12V BEC for the VTx and Camera, but I still get OSD flicker when throttle is on. I posted on the iNav facebook page and a lot of people recommended adding a separate ground connection to the Omnibus board, direct to the flight battery ground. I think maybe that might help you also? I would try connecting the PDB ground to the camera in/out GND on the Omnibus and see if that helps.
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CurryKitten

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Re: ESC noise - but power should already be regulated.
« Reply #4 on: October 11, 2017, 02:47:08 PM »

I've had no end of issues with noise killing the OSD on my Omnibus F3 board, I have a similar setup where only the video is connected as I have a separate 12V BEC for the VTx and Camera, but I still get OSD flicker when throttle is on. I posted on the iNav facebook page and a lot of people recommended adding a separate ground connection to the Omnibus board, direct to the flight battery ground. I think maybe that might help you also? I would try connecting the PDB ground to the camera in/out GND on the Omnibus and see if that helps.

That's interesting - on my Martian III, which runs an Omnibus F3, the video is perfect, but the VTX has good filtering.  Do you mean keeping the grounds from the camera and VTX on the PDB and additional connecting grounds from the PDB to Vid In/Out on the Omnibus as well.  I wasn't clear if the idea was to desolder the ones from the PDB or add an extra one ?

iwan_canobi

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Re: ESC noise - but power should already be regulated.
« Reply #5 on: October 11, 2017, 03:57:00 PM »

I think adding an extra ground link between the PDB to the Vid In/Out of the Omnibus. It should all be shared any way but some people suggested that should help. My image is fine with no noise, it's just the OSD itself which is flickering. I need to experiment further with it but haven't had the time so far.
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English Turbines

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Re: ESC noise - but power should already be regulated.
« Reply #6 on: October 11, 2017, 06:20:35 PM »

 I just use a small LP filter from E-Bay for 2.99.....That feeds the Omnibus and also the Camera and VTX via the RAM pin jumper.

 Clean power to FC and Video....Foolproof

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