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It’s actually quite straightforward to decide what type of controller is most appropriate for any given situation. Firstly, take account of how much equipment, or indeed how many cameras will need to be remotely controlled. With a very basic application like a Pan only head, or a basic Pan and Tilt without a zoom lens, then it is perhaps easiest to use a simple Direct Drive controller configured for a 24v AC unit (much safer than running mains voltages) . If for example there is only a single camera that needs to be controlled, consider the distance from camera to monitoring point, and obviously whether there is a mains electric supply available at the camera end. If it is a relatively short distance (for arguments sake up to 50 metres), and there are no plans to ever extend the system, then you might as well use a standard Direct Drive controller with the appropriate multi core cable. If it is a much longer distance, then a simple Telemetry transmitter / receiver package may be more cost effective. It is important to remember that whilst the larger and more sophisticated telemetry controllers are capable of routing video signals out to a number of display devices, it can sometimes be more flexible (and preferable) to use a seperate video switching system. If you are intending to use telemetry, then there is the obvious choice of ‘up the co-ax’ or ‘twisted pair’. In practice the majority of applications will best be served by using the cheaper co-axial control option . This of course does not require the provision of any additional cabling unlike the twisted pair approach. If you think about it, it’s perhaps inappropriate to describe it as the twisted pair technique, but more accurate to say independently transmitted data link. Consider if you will, the use of an alternative video signal transmission medium, such as fibre optic cable or microwave link. Neither of these are capable of supporting (multiplexed or bi-directional) co axial telemetry, so you will have to adopt a seperate data link to provide the control facilities. With larger and more complex CCTV systems, fibre optic (or if you prefer optical fibre) will provide the most flexible (pun not intended) approach to multiple format signal handling, with modules offering Video/Audi/Data links down a single fibre. | ||||||||||||||||||||||||||||||
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