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 Type||Cable Group||Operating Frequency||Impedance||Jacket Material / Size||Dielectric Material / Size||Centre Conductor Material / Size||Conductor Type||Shielding Outer Conductor|
|Belden 1505F||BC||DC-6GHz||75 ohms||PVC / 6.15mm||FHDPE / 3.68mm||Compacted Copper / 0.79mm||Stranded/ Flexible||Tinned Copper Braid|
|Belden 1694F||AS/BH||DC-6GHz||75 ohms||PVC / 7.01mm||PE / 4.57mm||Copper / 1.016mm||Stranded/ Flexible||Double Layer Tinned Copper Braid|
|AS/BH||DC-12GHz||75 ohms||PVC / 6.8mm||FHDPE / 4.8mm||Copper / 19/0.2mm||Stranded/ Flexible||Tinned copper Braid & Foil|
|AS/BH||DC-12GHz||75 ohms||PVC / 7.2mm||FHDPE / 4.8mm||Copper / 19/0.2mm||Stranded/ Flexible||Double 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 Type||Micro BNC Connectors||Maximum Distance at CXP-3||Maximum Distance at CXP-6||Maximum Distance at CXP-12||Min Bend Radius|