Transmission grade 11mm triaxial camera cables

Van Damme transmission grade 11mm triax cables are available as a solid conductor polyurethane (PUR) sheathed type for outside broadcast runs, and a thermoplastic rubber jacketed stranded centre conductor type for studio floor and patching applications. Both cable types will work with the industry standard triax connectors such as Lemo and Fischer, and in common with UK conventions they have a red outer sheath.

Materials
Van Damme uses silver plated ultra pure oxygen free copper for the centre conductor of both the solid and stranded cables. The use of oxygen free copper improves the conductivity of the cable. The additional advantage of SPOFC is that silver is approximately 5% less resistive than copper. High frequencies, which gravitate to the outside of the conductor due to the skin effect, are conducted slightly more efficiently than the lower frequencies that tend to saturate the UPOFC conductor. In addition silver is less susceptible to corrosion than copper and so the plating offers a protective barrier between the conductor and the insulation or free air.

Foam skin polyethylene is used for the conductor insulation. This special insulation is made up of individual pockets of inert gas suspended in polyethylene, resulting in a low dielectric constant and most importantly low capacitance. The skin refers to the outer layer of the insulation, which forms during the extrusion process. This skin is harder than the layer of insulation below it ensuring that the conductor is well protected. The dielectric constant of foam skin polyethylene remains stable over a wide frequency range. Other relevant properties include good stress and temperature resistance.

The insulated conductor is screened with a 95% optical coverage silver plated oxygen free copper braid- in practice this ‘screen’ is actually the outer conductor for the camera signal. An additional layer of polyethylene is placed over the first braid and the actual screen of the cable is applied - again 95% optical coverage braided copper but tinned and not silver plated. The solid type has an extruded outer jacket of polyurethane; an extremely tough and anti-abrasion material ideal for the rigours of the outside broadcast environment. The stranded variant has an outer jacket of thermoplastic rubber (TPR). This material has excellent flexibility characteristics combined with good tear and cut resistance.

Applications
• PUR sheathed cable with solid centre conductor for long transmission lengths and hostile environments typically encountered in outside broadcasts
• TPR sheathed stranded centre conductor type for patching applications and studio floor cameras
• Designed for industry standard 11mm triaxial camera connectors
• Can also be used for exceptionally long runs of serial digital video with triax connector to BNC adaptors