I found a few good deals and they are in the mail:1) Speco HT650PT10X High Resolution Motorized Dome Camera
2) Speco DVR4TL250 4 Channel DVR
Now a few questions please -- the DVR has BNC camera inputs but the instructions for the camera are a little more complex:
Connect the camera using the supplied terminal block:
A) Connect the control unit via the twisted, 2-conductor line (max length length 1200 meters) to the pin array 5 (RS485A) and 6 (RS485B). Connect all cameras in parallel to this 2 conductor control line.
B) Feed the video signal at contact 3 via a shielded cable to the video input of the following unit (eg, monitor, camera switcher, video splitter)
Connect the shield to contact 4.
C) 12V + to pin 1 and ground to pin 2.
Ok now ..... RS485 control signals interface at a terminal block on both the camera and DVR. What is the best twisted wire pair to use for this? Would one twisted pair of a Cat 5 cable work ok for 100 yards?
If Cat 5 cable is used for the RS485 control signals, can I transmit the video and "shield" down a second twisted pair in the same Cat 5 cable?
Could I ship 12 volts and ground down a third twisted pair in the same cable? If so, how far?
Last problem, the DVR has BNC connectors for video in. Would I just soldier a BNC connector on the video cable for connection at the DVR? What about impedance matching? Any problems to watch for? What am I missing?