Installing a Twist-on type BNC Connector
Use a stripping tool to strip the shielding from the coax part of the cable. In order for the connector to go on smoothly you will want about 3/4" of the center conductor showing and about the same amount of the copper wire braid showing (see figure 2 below).
Make sure that none of the strands of copper wire braid touches the middle conductor wire when you twist on the BNC connector. If they accidentally touch, this will not damage the camera but can result in a black (shorted out) image from the camera.
Twist on the BNC Connector onto the wire until it is snug. You will repeat Steps 1 - 3 for the DVR end of the COAX cable.
Installation of the 2 Piece BNC Crimp type connector
A crimp type connection allows for quick and simple installation while still maintaining a mechanical and electrical connection fairly close to a solder type termination. Some of the key points to remember are as follows: Make sure to use the proper size connector for the type of cable you are using. Make sure all cuts and stripping is clean. Avoid nicks as much as possible. Use the proper crimp tool; don't try to improvise with pliers, etc. Follow these steps.
Installation of the BNC connector to the RG62 and RG58 cable
BNC connectors are not hard to install, but they must be installed correctly or they can cause problems down the road. Reproduced below are the instructions from Amphenol (the biggest connector maker). Here is a technique which requires no special tools other than a cable stripper and a crimping tool and which you may find easier than trying to measure the dimensions given in the Amphenol instructions below. You should have a look at the instructions from Amphenol, since some important warnings are contained in them, you may find an easier technique than what is described here.
That's it You're Done!!
- Place the Plug Body assembly on the work surface
- Place the male contact pin on the table with the tip of the pin aligned with the front of the plug assembly
- Place the cable next to the pin with the end of the cable just beyond the little hole in the side of the pin
- Carefully cut the cable outer sheath right where it lines up with the cable-entry edge of the Plug Body.
Do this with a razor blade or knife being very careful not to nick or cut any of the shield braid wires.
It's better to remove too little sheath than too much. You can remove more later if necessary.
- Slide the Outer Ferrule onto the cable
- Push back the braid to expose the inner conductor
- Using a razor blade or knife, cut off about 4mm (.156") of insulation from the end of the inner conductor.
Again, be very careful not to nick any of the conductor wires.
- If using RG62 cable (93 ohm) put the little bushing onto the center conductor as shown in the picture below. Bushing not needed for RG58
- Place the Male Contact Pin onto the inner conductor, making sure all wires are inside the pin. If the pin doesn't fit snugly against the insulation, remove it and trim the conductors until it does. NO INNER CONDUCTOR WIRES SHOULD BE EXPOSED
- Using the appropriate crimp tool (the gold-colored one for RG58, found in the "miscellaneous wrenches" drawer in RM 107) crimp the pin onto the inner conductor
- Push the Plug Body Assembly onto the cable until you feel it 'snap' into place. The end of the pin should be flush with the edge of the Plug Body. If you can't push it in far enough because not enough outer sheath was removed in step 4, trim a little more of the outer sheath off until the Plug Body goes all the way on and the pin snaps in. BE VERY CAREFUL AT THIS STEP THAT NO BRAID WIRES ENTER THE PLUG BODY. THIS CAN CAUSE A SHORT.
- Push the braid up over the Plug Body and trim it with a cutter or scissors so that it comes just up to the larger diameter part of the Plug Body. It should come all the way up over the knurled or ridged crimp barrel. Having braid wires stick out because they're too long is unsightly, but a greater problem is having them too short and becoming disconnected from the Plug Body.
- Slide the Outer Ferrule up over the braid and the plug body as far as it will go, then crimp it in place with the crimp tool.