It requires a few tools many households may not have on hand, but which can be purchased at little cost from a hardware store. No new BNC connector need be bought, and no soldering is needed.
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Cut the BNC connector off the cable it is attached to with the wire cutters. Remove the crimping ring from off the cable.
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Cut a 2-inch slit in the outer insulation of the cut end of the cable with the utility knife. Pull the outer insulation back from the cable. Cut off the outer insulation using a scissors.
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Push the exposed copper wire surrounding the inner plastic sheath back with your fingers so that it lies against the outer insulation still on the cable. Smooth the copper wire down so that it forms a ring around the inner plastic sheath against the outer insulation.
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Cut a 1-inch slit in the end of the inner plastic sheath with the utility knife. Pull the cut inner plastic sheath off the copper wire that is inside. Twirl the copper wire between your fingers to form a rod.
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Place the BNC connector onto the cable--pushing it all the way until it meets the outer insulation. Pull the copper wire surrounding the outer insulation onto the edges of the BNC connector.
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Place the crimping ring over the BNC connector and onto the cable. Push the crimping plate up against the outer insulation at the back of the cable and over the copper wire that is on top of the BNC connector.
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Clamp the jaws of the BNC crimping tool around the crimping plate. Rotate the BNC crimping tool to secure the crimping plate into position and lock the cable down onto the BNC connector.