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Originally Posted by 1010011010
Another reason security tapes are often jerky is because multiple cameras will be recorded onto a single tape in a round robin fashion. The tape you finally see is when someone has cut out all the frames captured from Cameras B and C, and only the images from Camera A are left.
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Well, no. When mulitple cameras are recorded onto one VHS tape the video is multiplexed. You have to have a multiplexer to play the video back though, a standard Wal-Mart VCR won't even give you an image.
There is, however, usually an analog coax vido out on a mulitplexer that will enable you to record the video you are viewing.
The jerky is usually interference or the power/video settings are tweaked right. Also, since there is usually some sort of zoom involved, the cameras tend to shake a little with even just a little wind.
/BTW - I am a security systems engineer