bigbrickhouse

Bought four 12 volt DC powered ir cameras with built in illuminators. Also purchased an additional fused 8 output terroidal transformered power supply. Getting lines in the same two cameras scanning from top to bottom. At times the interference is worse, so much so that the actual picture will jump over to the other position that shares the interference. Upon further inspection of the install the installer had a run a 100 foot extension cord for the Dvr and plugged it into a powerstrip shared by the two power supplies. When I plugged the one power supply into a plug not in the power strip but presumably different circuit across the room the problem seemed to dissapear...initially. It then returned later and is random in it's behavior sometimes almost invisible and sometimes terribly jumpy. I also used what I now term the gumpack ac to dc converters available for around 6 bucks a piece. One for the camera and one for a receiver/driver at the same location. The pan and tilt platform is 24v ac. These devises are only putting out 9 volts at best. When the platform is activated it disturbs the video probably due to the voltage drop from an already weak 9 volts. When this one camera is disconnected the video interference on the other one stops. Where can I start with diagnosing this problem? Why would this one camera effect another and always the same camera but not the other two?

How can I test a DVR's protocol outputs without a PTZ cam? The install has a Speco 4 Channel DVR. I put in two Pelco PTZ platforms and an aftermarket PTZ receiver driver for each. The receiver's language is Pelco D. The DVR has Pelco D protocol but I'm not getting any reaction out of the receiver/drivers when commanded to move. I've tested all wiring as well as all available baud rates in the DVR. The receiver manufacturer recommended taking a known working PTZ controller with Pelco D to test the receivers which they claimed they've never had problems with. The install is 400 miles away and I need to diagnose it on the weekend when little or no tech support is handy. I'm doubting that two brand new receivers would be DOA. The SPECO dvr was not part of my install but is only 8 monthes old since new. Any insight as to a way of testing the DVR's Pelco D control output without a PTZ cam and any other insight as to what could be going wrong would be appreciated.