Radio Frequency Coaxial cable is a double conductor electrical cable which comprises of a center conductor and an outer conductor with an insulating dielectric between them, dielectric is used to produce an electrically shielded transmission circuit so the signal propagates within the dielectric insulator i.e. copper conductor.
These are used for the transmission of Radio Frequency energy. The system offers tight control over electrical impedance that yields best performance at high frequencies and excellent Electromagnetic Interference (EMI) control/shielding.
A broad range of applications exist for coaxial cabling. The two primary impedance values of 50 and 75 Ohms determine specific applications with 50 Ohms primarily used in data signal applications and 75 Ohms used in video signal applications.
Radio Frequency Coaxial cables are used extensively to interconnect a wide variety of home entertainment equipment such as TV, DVR and VCR or transfer of video image from CCTV camera to monitor and these use 75 ohms cables such as RG6, RG59A/U, and RG59B/U for audio and video signaling. Connectors used for these are BNC of type F and RCA.
Other areas include Global Positioning Systems GPS, Telecommunications and WAN/LAN and these uses 50 ohm cables.
GPS uses coax cables for communication between antenna and other related equipment, RG174, RG188 or RG316 are often used with SMA, MCX or MMCX connectors. In addition, RG58 with TNC and with type N connectors is used for remote antenna feeds.
In telecommunication sector, interconnection applications like Cell towers and communication equipment in base station facilities uses coaxial cables. In these applications RG58, RG223 and RG213 cable with BNC, TNC and of type N connectors are often utilized.
Wide Area Networks and Local Area Networks often utilize RF Coaxial cable for equipment interconnection. RG58 and RG174 are two common cable types used in their applications. BNC interface connectors are the most common connector types used in these situations. In addition reverse polarized connectors are found on many wireless antenna interfaces.
RF Coaxial Cables supports multiple channels and have greater bandwidth as compared to twisted pairs thus offering substantial capacity and its performance is not affected either by NTSC standard at 6MHZ or PAL at 8MHz. Error rates of Coaxial Cables are normally 10 bps because the inner conductor is in a Faraday shield, this also improves the noise immunity and reduces crosstalk so we don’t have to put amplifiers closer to each other.