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Coaxial Cable

Coaxial cable carries video and radio signals along a single screened core, and the right type depends on the signal it has to carry. This collection has RG6 and 100U cable for TV and satellite, RG59 and shotgun cable for CCTV, Belden SDI and UHD broadcast coax, 50 ohm RG-8 and Thinnet cable, and twinax for data and fieldbus links, from makers including Belden, Securi-Flex and Mercury.

Choosing Coaxial Cable

Match the cable to the signal first, then to where it will run: the conductor and impedance set the performance, and the jacket sets where it can go.

TV and satellite

Mercury RG6, such as the 808.119UK with an aluminium braid, and foam-filled 100U such as the 808.151UK are 75 ohm cables for digital, satellite and cable TV signals. For a dish with a dual or quad LNB, the twin RG6 808.129UK comes on a 250m reel. Securi-Flex SFX/100 and SFX/125 low-loss cables use gas-injected foam and a foil and braided screen for CCTV, TV and satellite.

CCTV

Shotgun cable, such as the Mercury 808.105UK and the Securi-Flex SFX/59+2C models, joins an RG59 coax to two power cores, so video and camera power share one run.

Broadcast and SDI

Belden SDI coax, such as the 1694ANH RG-6 and the 1855ENH mini RG-59, is 75 ohm cable for serial digital video in studios and AV rooms. For 4K UHD, the 4794R 0091000 is a coaxial cable for 12G-SDI and the 4694ANH 0061000 is a precision video cable rated to 12 GHz.

50 ohm and twinax

Several cables here use other impedances. The Belden 9914 is 50 ohm RG-8 for wireless transmission, the 9907 is 50 ohm Thinnet for 10BASE2 Ethernet, and twinax such as the Belden 9207 and Securi-Flex SFX/TWINAX-272-LSZH-BLU-100 serves control, instrumentation and fieldbus links.

CableImpedanceTypical useExamples
RG6 and 100U75 ohmTV and satelliteMercury 808.119UK, 808.151UK
Twin RG675 ohmDual or quad LNB dishesMercury 808.129UK
RG59 shotgun75 ohmCCTV video and powerMercury 808.105UK, Securi-Flex SFX/59+2C-0.75-LSF-BLK-100
SDI and UHD75 ohmBroadcast videoBelden 1694ANH, 4794R
RG-850 ohmWireless transmissionBelden 9914
Twinax100 or 124 ohmData and fieldbusBelden 9207, 9271

Brands we stock in Coaxial Cable

Axis Communications, Belden, Bosch, Comelit PAC, Dahua Technology, Fermax, Hanwha Vision, Hikvision, i-PRO, Mercury, Securi-Flex, SFX Cables, Teledyne FLIR, Vanco and WEC.

Belden, Securi-Flex and Mercury make most of the coaxial cable here.

Related categories

For aerials, amplifiers and splitters see TV aerials and reception; for data runs, the wider network cables and accessories range and Ethernet cables.

Frequently asked questions

What connectors are used on coaxial cable?

Common coax connectors include F-type plugs for satellite and TV, BNC connectors for CCTV and SDI video, and IEC plugs for many aerial sockets. Match the connector to the cable's diameter and impedance, since a plug made for a thicker cable will not fit a thinner one properly. Crimp or compression connectors usually give a firmer joint than twist-on types. The range here includes satellite, CCTV and broadcast SDI coax.

What is a coaxial cable?

A coaxial cable carries signals along a central conductor surrounded by insulation, a metal screen and an outer jacket, arranged around a shared axis. The screen keeps interference out, which suits TV, satellite, CCTV and broadcast video. Choose the type by its impedance, such as 75 ohm for video. The range here includes TV, CCTV, shotgun and broadcast coax.

How do you join coaxial cable?

Coaxial cable is usually joined by fitting a matching connector to the two cut ends and linking them with a barrel coupler, never by twisting the cores together. The centre conductor and the screen need to stay continuous, or the signal suffers. Seal an outdoor joint against water, and where possible use one unbroken run, since a join adds some loss.

  • Established 1975
  • Birmingham trade counter
  • UK-only supply

Written by the West Midlands Electrics technical team

Updated

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