I am making a dual camera PTZ unit of my own and have a question for anyone that has tried doing this.   
  
Using the auxiliary cables in the PTZ I routed a cat ve cable through the housing and connected it with the blue and black auxiliary cables, but the video from this is not clear.   
  
Another guy I knew had successfully made three of these with no problems.  Any advice on improving the video that runs through the housing.  The video image from this is color, but a very unclear picture.  It is not rolling and doesn't appear to be a grounding issue. 
  
I am using NVT video balum converters.