Thank you so much for your reply. Yes, your message make sense. It is standard coax with BNC connectors on each end. Yeah I wandered the same thing, how can some of those cameras be powered at such distance. But you are right, so of the pictures are grainy or weird off-colors. I do have a couple of cameras that the pictures are just black, but I haven't figured out which cameras they are yet.
My plan of attack is one building at a time. Work my way from office out toward the end of the line. Thanks for your help and suggestions. I am planning on replacing the DVR anyway. I did get permission from the owners to do that, because the current DVRs are 15 years old. Need to get some newer technology in that place.
Your suggestions are welcome.
Thanks,
Randy