Video interference with 3DR 915 Mhz - and 900 Mhz video

I'm not sure what I was thinking, but I had a cheap radio system that runs on 900 Mhz

Actually, I do not use this camera but a GoPro and I have upgraded the antennas.

And then I thought I read somewhere that it was possible for both the telemetry and video to both function in the 900 Mhz together...  So I purchased the following

Well, the telemetry seems to work fine and the video is amazingly distortion free........ until I turn on the motors.  Then the video goes black and white with a lot of distortion.  Sometimes when in the air the color comes back but only briefly.


So I'm thinking I need to change frequency of either the telemetry or the video .... or does somebody have a better idea?  And most likely it will be to upgrade the video system.  But then I'm not sure what would be the best frequency or system.  Any ideas or thoughts would be welcome.



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  • Maybe old answer and you already did solve...

    I have same combination as you and I did add this filter and this woks fine for me.

  • Somehow, need to merge the two threads.


    We got this one solved, all it needs is the filter installed and done. Point being, this should be a good thread for those who want to know if you can run both 900MHz video and 915MHz 3DR radios, and the answer is, YES it works fine.

    Just keep noise out of the video link as those transmitters are prone to common mode noise and will amplify any noise on the power wires. Standard LC simple filter on the power will stop the noise.

  • You said it yourself... video and telemetry work fine and the motors/ESC are causing interference.

    So changing the frequency isn't going to help you.  More expensive gear with better front end filtering might help, but that is just ignoring the real problem.

    The EMI could be coming from the motors, the ESCs, or the PWM signal wires.  You could also have power supply issues causing noise in your power.  Without a scope your only real option is to move things around and see how it affects the signal.  If moving things around doesn't change the interference then you have a power supply issue.

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