How to Install a BNC Coaxial Connector

Written by joshua black
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How to Install a BNC Coaxial Connector
Install a BNC connector on coaxial cable using basic tools. (BNC connectors and cable image by Albert Lozano from Fotolia.com)

BNC connections are a common connector type for diagnostic equipment in the scientific field as well as some computer and audiovisual equipment. You can install a BNC connector on coaxial cable using some basic tools and a soldering iron. Once you have performed this procedure a few times, you can complete the entire process in about 30 minutes.

Skill level:
Easy

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Things you need

  • Coaxial cable
  • Wire stripper
  • BNC connector
  • Small ruler
  • Non-acid core 60-40 tin-lead solder
  • Soldering iron
  • Pliers

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Instructions

  1. 1

    Measure .28 of an inch from one end of the coaxial cable and carefully strip the outer jacket using wire strippers.

  2. 2

    Straighten out the braided shielding towards the end of the cable so that the inner core of the cable is evenly covered with shielding all the way around.

  3. 3

    Unscrew the BNC connector completely and slide the nut, washer and gasket over the end of the cable, approximately three inches down.

  4. 4

    Slide the clamp portion of the BNC connector over the exposed braided shielding until the bottom of the clamp rests where the cut outer jacket stops.

  5. 5

    Comb the braided shielding back over the top of the clamp and trim the shielding back so that it's .09-inches long.

  6. 6

    Trim the exposed centre core (dilectric) of the cable to .13 inches and then strip the end off the dilectric to expose .09 inches of the conductor in the centre.

  7. 7

    Slide the BNC connector pin on to the end of the conductor until it butts up against the end of the cut shield on the dilectric. Solder the pin in place.

  8. 8

    Slide the outer jacket of the BNC connector over the pin and screw the nut and washer onto the jacket with pliers, allowing the entire BNC connector to become one unit.

Tips and warnings

  • When you are screwing the BNC connector together in the final step, make sure that you have a firm grip on the cable and the shell. This will prevent the shielding and pin from twisting inside the connector improperly.
  • Do not nick the sensitive centre conductor when you are stripping the core cover off the dilectric. This will result in electric signal noise.
  • Remove any excess solder or you may have trouble fitting the entire BNC connector together.
  • Do not overheat the cable with the soldering iron, as overheating may cause the conductor to expand and prevent you from inserting the cable into the shell of the BNC connector.

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