djbailey 0 Posted October 14, 2010 I have two dome cameras I am trying to connect to a dedicated TV (acting as a monitor). I have tried every which way and am running out of ideas. Using adapters I have connected both via the RCA video input and each camera works fine. I am trying to connect a switching solution to switch between the two cameras. The TV has only one composite video input and obviously a CATV F input. I have tried a multi-channel modulator, a video selector switch, two modulators output to different channels and combined, everything. What I don't understand is it appears as if the cameras are shorting each other out. If I have one connected to the video input and connect the other to a modulator, the minute I connect the modulator to the TV, the video blanks out and it sparks as the outer part of the connector (ground) makes contact. Any time both cameras are connected simultaneously through any type of apparatus this happens. PLEASE HELP! Share this post Link to post Share on other sites
Soundy 1 Posted October 15, 2010 One of these will do nicely... we use lots of them, they're pretty solid. http://www.samsung-security.com/products/quadsmultiplexers/ Share this post Link to post Share on other sites
djbailey 0 Posted October 15, 2010 I actually think I realized my problem. Since I was receiving sparks I decided to read voltage between the coax feeds. I have 12V from the coax ground of one camera to the coax ground of the other camera. This I would think explain the sohrting out. I am unsure of why this is happening though. What would cause 12V potential between the coax feeds? Share this post Link to post Share on other sites
Soundy 1 Posted October 15, 2010 Improper wiring, quite likely. Most 12V-only cameras use a common ground for the power and video (even in the connectors are separate, the two grounds are tied together internally). If one is wired wrong, or if one has an internal wiring fault, that could easily explain the problem. Share this post Link to post Share on other sites
