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Pelco Manual C505M-B (4/97) 3
3.0 INSTALLATION
3.1 SELECTING THE CORRECT RECEIVER FOR YOUR
APPLICATION
Successful installation must include proper application planning. The trade-offs and
application hints that should be considered for each receiver type are discussed in
the following subsections.
3.1.1 The CX9500 Coaxitron VIS Control System
A typical application is given in Figure 1.
Operating distance for the Vertical Interval Signaling (VIS) system is probably the
most crucial installation parameter. For a VIS control system, the maximum loss
allowed across the coax is 6 dB at 1 MHz. The actual distance for a system without
line amplifiers can be calculated by the following formula.
Distance = 6 dB / Loss of the coax cable and any splices.
Where the “Loss of the coax cable” is obtained from the cable manufacturer’s data
sheets. The splice loss can vary, but a good splice can be assumed to add about
0.5 dB loss to the cable.
Terminations for the video must be supplied at the controller end of the coax. The
correct termination is 75 ohms. If multiple components such as a VCR or monitors
are on the coax line, the piece of equipment at the extreme end should supply the
only termination.
Figure 1. Typical Coaxitron Application