NTSC Video issue

Discussion in 'General Electronics Chat' started by drkenwood, Aug 30, 2012.

  1. drkenwood

    Thread Starter New Member

    Aug 30, 2012
    I'm trying to pull a NTSC signal out of DVR to go into a USB Composite adapter. If the adapter isn't connected to the DVR pin at the right moment the attached picture happens. The signal doesn't roll. Just doesn't sync correctly.
  2. crutschow


    Mar 14, 2008
    What do you mean "at the right moment"?

    The sync issue may be a signal level problem. Could be either the DVR or the USB adapter. Don't see how to readily solve that.
  3. vk6zgo

    Active Member

    Jul 21, 2012
    Do you have an Oscilloscope?
    If so,place a 75ohm termination across the input,& look at the video signal from your DVR.
    The overall amplitude should be 1 volt ,with the syncs being just a bit less than 0.3v.

    If you don't have a 'scope,but have an ordinary analog TV with AV inputs,try the video signal into that.
    If it also has problems,that places the problem in your DVR.
    If not,it is in your adaptor.