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High Flex Cable Information

A standard coaxial cable is made from a centre core which the signal propagates along, a dielectric to make sure that the signal is retained in the core, a braided shield and a PVC jacket. The centre core on most coaxial cables used in broadcast systems is a single strand of signal wire usually made from copper or for high-frequency applications the core is also silvered to add conductivity to the cable.

In systems that demand movement of the cables with items of equipment, a flexible cable may be a solution, for a cable to become more flexible it needs to have a core that is multi-stranded. This allows for the cable to bend and flex without the potential to break that a single core has. The downside of increasing the cable's flexibility is that the signal integrity isn't as good as a single-core version.

The areas of application that require more movement of the cable than others are Machine Vision and Medical equipment, which tend us use the CoaXPress protocols.

CoaXPress offers a combination of Image data, Communication, Control and power over a single coaxial cable increasing the demands of the cable from a simple SDI standard. If you are looking for a cable to offer flexible SDI capability the following information will more than cover these standards too.

Cable TypeCable GroupOperating FrequencyImpedanceJacket Material  / SizeDielectric Material / SizeCentre Conductor Material / SizeConductor TypeShielding Outer Conductor
Belden 1505FBCDC-6GHz75 ohmsPVC / 6.15mmFHDPE / 3.68mmCompacted Copper / 0.79mmStranded/ FlexibleTinned Copper Braid
Belden 1694FAS/BHDC-6GHz75 ohmsPVC / 7.01mmPE / 4.57mmCopper / 1.016mmStranded/ FlexibleDouble Layer Tinned Copper Braid
AS/BHDC-12GHz75 ohmsPVC / 6.8mmFHDPE / 4.8mmCopper / 19/0.2mmStranded/ FlexibleTinned copper Braid & Foil
AS/BHDC-12GHz75 ohmsPVC / 7.2mmFHDPE / 4.8mmCopper / 19/0.2mmStranded/ FlexibleDouble Tinned Copper Braid

Key to acronyms:

PVC - Polyvinyl chloride

FHDPE - Gas injected Foam High-Density Polyethylene

Cambridge Electronic Industries have been testing the capabilities of multistranded coaxial cables for use in a CXP environment and are happy to offer the following information on lengths of cable that can be achieved depending on the frequency of the signal. The tests were completed using a Bitflow CLX-PC2-CXP1 and a Basler BOA4096-93CC 1C Camera. Other test setups may provide different results.

Cable TypeMicro BNC ConnectorsMaximum Distance at CXP-3Maximum Distance at CXP-6Maximum Distance at CXP-12Min Bend Radius
Belden 1505FXPT-D001-NGAB
Belden 1694FXPT-D001-NGAS
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