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Author Topic: HD-SDI terminations Chase Taylor Expert Film Handler Posts: 175 From: Troy, Alabama, USA Registered: Mar 2001 posted 08-09-2010 02:08 PM                        What does everyone use to terminate there HD-SDI cables with? I've used some Bomar 678-KCC1694BQ that was just badly designed connector. I switched to ICM Corp FS6BNCU-R with some luck now I've had some trouble with those. Does anybody have any recommendations? Chase  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-09-2010 05:26 PM                     It depends on the cable you use...a VERY BIG key is to match the cable and connector. If using Belden 1694A, we use AMP or Kings connectors.  |  IP: Logged Mark Ogden Jedi Master Film Handler Posts: 943 From: Little Falls, N.J. Registered: Jun 99 posted 08-09-2010 06:34 PM                     For one thing, I recommend NOT using a compression-style connector, as the two you mentioned are. I don't know if you are doing permanent block point style wiring, or if you are often making and breaking these connections at a device, but I've never seen one hold up over the long haul. Invest in a good crimping tool, and use the connectors Steve mentioned, or any other ones that require you to crimp the center pin right onto the cable center conductor, and then the jacket sleeve to the outer shield. Make double sure that the strip depths and lengths are accurate for the connector you are using, or the whole thing will fall apart pronto. Kings are pretty much the broadcast standard, for what it's worth.  |  IP: Logged Bruce Hansen Jedi Master Film Handler Posts: 847 From: Stone Mountain, GA, USA Registered: Dec 1999 posted 08-09-2010 08:36 PM                     Make sure that you use 75 ohm connectors. With composite video, the wavelengths are long enough that using a 50 ohm connector worked fine; but HD-SDI runs at 1.5 Gigs. The much shorter wave lengths don't like those old 50 ohm connectors. As above, use crimp on connectors; don't ever use screw on connectors, they are pure CRAP. When crimping the center pin, it should sit right down on top of the center conductor insulation. This keeps the impedance correct. Use the proper crimp tool for the connectors you are using. A properly crimped connector will be VERY hard to pull off the cable.  |  IP: Logged Chase Taylor Expert Film Handler Posts: 175 From: Troy, Alabama, USA Registered: Mar 2001 posted 08-10-2010 08:49 AM                        Thanks for the reply. I've always used AMP for my DB25 connections, but with my attempt to make my HD-SDI cables look as nice as I could I went with the compression connectors, that was a mistake. I will take a look at AMP and King, I'm using 1694A do you have a part number to save me the time of digging to the end of the world to find. Tyco/AMP does not make this easy. Thanks Again Chase  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 08-10-2010 08:51 AM                        Call Markertek. They have pretty much every type of cable and connector that you could possibly need (both video and audio). The people who answer the phones actually know about the products that they sell, too.  |  IP: Logged Bruce Hansen Jedi Master Film Handler Posts: 847 From: Stone Mountain, GA, USA Registered: Dec 1999 posted 08-10-2010 05:42 PM                     IMO, 1694A is good for long runs (+250 feet), but it is stiff, heavy, and expensive. For shorter runs you can use 1505A, which is a RG-59 like SDI/HDSDI cable. For short runs use 1855A. It is smaller, more flexible, and lighter. Beldon says 1855A, in new condition, will do 210 feet with HDSDI. I would not push it, though. When wireing patch panels, or DAs, where there are a LOT of cables, and usually short runs, 1855A is a lot easier to work with. Using 1694A, the rack would be so crammed with cable, you could not get to the back of the equipment. In a truck, where weight is a consideration, 1855A is lighter. There is also a HDSDI version of RG179 (the real tiny stuff).  |  IP: Logged

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