Why is solid copper conductor preferred over copper clad steel conductor in closed circuit television applications?
The copper clad steel conductor was specifically developed for use in coaxial cables intended for RF use. RF implies that the signal being carried by the coax is of “high frequency”. All conductors that carry alternating currents have losses that are associated with the conductor’s resistance. Due to skin effects, the resistance increases when an alternating current flows in it. This effect causes the current to flow more in the outer region of the conductor and not in the centre, and is due to inductive effects. This effect also increases with the magnitude of the frequency of the alternating current. So much so that at RF, only the very thin surface layer is useful for carrying currents.
Therefore, to reduce the cost of the cable, the centre of the conductor is replaced with a low cost material such as steel. Closed circuit television applications employ the base video signal, which consists of alternating currents of much lower frequency than RF. At these frequencies, the skin effect is not as significant so a greater proportion of the conductor can be utilised for carrying the video signal current. Therefore, the solid copper conductor will have a lower loss for video signal when compared to a copper clad conductor, so it is preferred for CCTV applications.
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