FPVLAB

image
Page 1 of 2 12 LastLast
Results 1 to 10 of 20

Thread: What are causing these lines in the video?

  1. #1
    Navigator
    Join Date
    Feb 2011
    Posts
    753

    What are causing these lines in the video?

    I thought there was a similar thread on here but if there is I can't find it.

    Anyway anyone have guess as to what are causing the lines in this vid.?

    It's obviously not esc noise as the motor is not turned on yet.


  2. #2
    Navigator
    Join Date
    Aug 2011
    Posts
    77
    It could be a switched mode PSU problem but no idea if your using one or not.

    Could you describe your wiring at all? .. how various things are powered, how they are wired up etc.

    Are you using screened cable for the video link from camera to video TX?

    How close is the video TX's antenna to the camera?

    This is assuming your transmitting live video from your aircraft.

  3. #3
    Navigator
    Join Date
    Feb 2011
    Posts
    753
    Yep using this switching psu as it is said not to cause interference with uhf. I guess that's step one to try.

    Very basic wiring. No screened cable. Just wire coming off my 4s bat to the psu, the output from that goes to the cam and vtx. A video wire going from the cam to the vtx( the wires are all servo wire).


    There's about a meter between the vtx and cam. And the same between the rc rx and vtx and cam.

  4. #4
    Navigator
    Join Date
    May 2011
    Posts
    141
    Had identical lines with LawMate 500mW vtx when used with supplied (on-cable) PSU. Problem gone when I changed 5V supply. If your setup can handle 12V try powering it directly from 3S. If it is 5V try using BEC (from ESC for example) That should give you an answer if it is power related problem or something else.

  5. #5
    Navigator
    Join Date
    Aug 2011
    Posts
    77
    A meter of non-screened wire for the video line from camera to video tx is not a good idea.

    You need to make that connection with a screened lead, preferably 75ohm thin coax for best video quality.

  6. #6
    Navigator
    Join Date
    Feb 2011
    Posts
    753
    Well in case I put anyone off the dpcav psu I've tested it right up against it and it isn't that.

    Thanks I'll try shielding the video wire.

  7. #7
    Navigator
    Join Date
    Feb 2011
    Posts
    753
    So would I be beter off having shielking around just the video wire or around the vid, power and ground wires ( not shileded individually)?

  8. #8
    Navigator
    Join Date
    Aug 2011
    Posts
    77
    I'd try just using some cheap screened lead just for the video signal from camera to video tx - for now.

    If that doesn't help, then take a look at the power supply to the camera and video tx - noisy supply to either could cause what your seeing.

  9. #9
    Navigator
    Join Date
    Feb 2011
    Posts
    753
    THanks so I tried a shielded video wire and it hasn't made a dif.

    I suppose the next thing to try with be a ferrite ring net to the vtx?

    Would IU wrap the video signal wire in the ring or the power wires or?

  10. #10
    Navigator
    Join Date
    Aug 2011
    Posts
    77
    Does it happen if all you have powered up is the camera and video tx ?

Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 49
    Last Post: 25th February 2013, 01:26 PM
  2. Replies: 6
    Last Post: 20th December 2011, 06:29 PM
  3. 1.28ghz causing hell on 72mhz
    By Blackley1 in forum RC TECH
    Replies: 9
    Last Post: 19th November 2011, 01:04 PM
  4. OSD Text Streaks/ Lines
    By durangoflyer in forum RC TECH
    Replies: 4
    Last Post: 29th October 2011, 02:29 AM
  5. Band on recorded vide, any ideas whats causing it ?
    By Coyote in forum IFR - Video Link Discussion
    Replies: 6
    Last Post: 16th June 2011, 01:38 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •