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Blue Jeans Cable 3G/6G HD-SDI Cable, Made with Belden 1694A and Canare BNCs (25 Foot, Black)

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1694A SDI black1694A SDI black

Belden 1694A SDI Cable

The industry standard in serial digital performance

Since Blue Jeans Cable"s earliest days, we"ve been working with Belden 1694A SDI coaxial cable -- a high-bandwidth, low-loss SDI cable used by industry professionals for decades. 1694A is good for anything from standard-definition SDI all the way up through 6G, and will support runs in the hundreds of feet (see chart below).

The BNC: Canare BCP-B53

For connectors, we use the Canare BCP-B53 male BNC plug. This BNC is a three-piece crimp design with excellent mechanical stability and electrical characteristics, and features a broad grip surface for ease of use. It was designed specifically to fit Belden 1694A, and so its dimensions are ideal for a smooth cable-to-plug transition.

Product highlights:

  • 18 AWG bare ETP copper center conductor
  • Foamed HDPE dielectric
  • Belden Duofoil two-sided foil shield, overlain with 95% coverage tinned copper braid
  • Rated CMR; allows installation in walls and risers
  • Available in ten jacket colors
  • Bulk cable made in Richmond, Indiana; finished assembly made in our shop in Seattle, WA
  • Canare BNCs for excellent mechanical and electrical performance

SDI Cable: More Complex Than It Looks

Coaxial cable seems simple, doesn"t it? And yet, when high bandwidth is to be delivered, it"s anything but simple to actually manufacture a consistent, precision quality cable. Why is that?

Any transmission line has a characteristic impedance, and in the case of video cable, equipment invariably calls for that to be 75 ohms. The characteristic impedance of a cable is a function of its physical geometry and materials: especially the dielectric, that inconsequential-looking layer of plastic which insulates the center conductor from the shield. Characteristic impedance isn"t load impedance: you can take your ohmmeter to video cable and measure all you like, but you won"t find 75 ohms anywhere. Rather, the characteristic impedance of a line is a way of describing how its impedance affects the impedance of the load: the load should look like a 75 ohm load (not just in terms of resistance, but in terms of reactance) when it"s hooked up directly to the source, and it should look like a 75 ohm load if it"s hooked up through a run of cable, no matter the length. A balance of inductive and capacitive reactance – from the inductance and capacitance of the cable – achieve this end.

But, alas, it"s not so simple as looking at the massed values of inductance and capacitance for the cable run. Signals propagate down a cable over time – traveling at a significant fraction of the speed of light – and react to local conditions at every point along the way. Changes in the impedance as seen at any point along the line cause signal reflections – what we call "return loss" – and these add up, not only diminishing but actually interfering with the intended signal. Above all, what a cable needs, to minimize these reflections, is consistency: consistency of dimensions, even down to microscopic levels, and consistency of materials. If the density of bubbles in the dielectric varies, or a wire has been drawn over a wheel that"s out of round and so gets slightly bigger and smaller along the way, or any of a number of other little manufacturing issues, return loss rears its ugly head.

Belden, with its engineering center in Richmond, Indiana, knew these issues when SDI came onto the scene: it had been producing precision coaxial cables for other applications such as early digital telecommunications networks. And so while a precision video cable like 1694A might look superficially a lot like, say, a ten-cents-a-foot CATV drop cable, the engineering and the manufacturing resources that go into it are a world apart. Equipment is carefully maintained to eliminate small periodicities and inconsistencies in dimensions. Dielectric extrusion is continuously monitored during production to catch even small departures from tight tolerances. Everything from tension on braider wires to the consistency of foil overlaps to the amount of nitrogen going into the polyethylene foam is watched, and checked, and the final product is sweep-tested just in case something, somewhere, has been missed. The result is a cable of tremendous physical and electrical consistency.

And we at Blue Jeans Cable should know. We"ve handled millions of feet of the stuff.

Assembled in Seattle Using the Best Methods and Equipment

Schleuniger coaxial cable stripperSchleuniger coaxial cable stripper

Stripped 1694A cableStripped 1694A cable

3-ton pneumatic press for crimping 1694A3-ton pneumatic press for crimping 1694A

Completed 1694A bnc assemblyCompleted 1694A bnc assembly

The Stripper

Stripping cable is a critical step: dimensions that are out of whack will cause damage to the shield braid or result in a weakened mechanical connection. All of our coaxes are stripped on Schleuniger Swiss-made coaxial cable strippers, custom-programmed for the precise dimensional requirements of the cable and the connector.

The Resulting Strip

The resulting strip is clean and dimensionally consistent, for a perfect fit every time. The fast-spinning blades have cut the braid without fraying or disrupting it and the center conductor is just the right length for full engagement with the pin.

The Crimper

Instead of hand crimping we use these three-ton pneumatic presses; the straight vertical action of the press gives the crimp perfect symmetry, and the heavy force means no crimp is ever halfway-done.

The Finished Cable

All of these details -- conductor and shield and dielectric lengths just right, powerful crimping force using the specified dies, and careful handling and inspection by our experienced technicians -- mean that we can produce to the highest standards of assembly quality, day in and day out.

Distance chart for Belden SDI cablesDistance chart for Belden SDI cables

Blue Jeans Cable: Decades of Experience in Precision Cable Assembly

Blue Jeans Cable has been in the cable assembly business since 2002, with our primary manufacturing operation in Seattle, Washington. Today we occupy a small industrial building in the Interbay neighborhood where we employ about a dozen people in cable assembly. From the very beginning, we"ve emphasized assembly, not import: if we can build the cable here, rather than offshoring it, we do, and in addition to conventional assembly techniques we"ve introduced novel materials, methods and processes, like our ultrasonically-welded speaker cable. We can"t underprice our foreign competition, but what we can do is produce goods of consistent higher quality; to do that we use the best American-made cable and the highest assembly quality standards. To do that, you need experienced workers, and so we try to be the sort of place where people want to work; our employee retention is high and that means that, likelier than not, the technician assembling your cable is someone who"s been doing this work for at least ten years. American manufacturing isn"t dead, and neither are good American manufacturing jobs; and we thank our customers for making this possible.

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