Image problem - diagonal lines - RC Groups
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May 01, 2008, 01:58 PM
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Image problem - diagonal lines

I have a problem with my video stream. There is a pattern of diagonal lines over the whole image. I made two screenshots of it:

I'm not sure but i think the direction of the lines varies so I guess its not a fixed frequency.

Has anyone experienced such noise? Those lines can be realy anoying when they get stronger and i would be very happy fixing this.

I am using a TX40 from on a seperate 7.4V Lipo. I put two chokes in series with the cam and two capacitors parallel to the chokes to filter out noise.
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May 01, 2008, 02:24 PM
Registered User
Daemon's Avatar
And what happens if you kill the motor?

May 01, 2008, 02:25 PM
MrGlobeFlight's Avatar

looks bad, are you using 2,4GHz RC-equipment ?

May 01, 2008, 02:29 PM
Registered User
JMSTECH's Avatar
Yes.. like Ian said... what happens when you kill the motor? Geshhh I wish Kilrah would get his tooty back from military duties... he could also help you out in a flash!
May 01, 2008, 03:00 PM
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oxxyfx's Avatar
This is typical switching power regulator noice. What value are the chokes and the capacitors? Also it would be helpful if you would shoot a picture of the setup - so we can see how the chokes and caps are installed.
May 01, 2008, 03:00 PM
Registered User
Could be the switching power supply if you're using one. It may not be filtered well enough for the camera or the video TX. Alternatively, it could be the camera shielding isn't good enough. See if the problem goes away if you adjust your grounding for the TX and the camera. Lastly, it could be coming on your receiver side as well so you may want to check that.

May 01, 2008, 04:41 PM
Registered User
This was my setup:

I tried to remove the chokes and capacitors from the setup and the problem is gone now.
Thx for all the replies.

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