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TNC crimping Technique

Daniels HX-4 and TNC connector

   Installation of avionics and appliances on aircraft requires the use of coaxial connectors of many different varieties. Most of the these coaxial connectors reguire crimping techniques to terminate the center conductor and shield. Below you will find one method of crimping a TNC type coax connector manufactured by Kings P/N M39012/26-0011. The crimp tool used is a HX4 manufactured by Daniels Mfg Corp and is used to terminate many styles of center pins & shield ferrels. proper use of these crimp tools will provide for a reliable and trouble free coaxial cable.

Attaining a professional high quality coaxial cable connection can easily be done with a little patience and practice. The following example will illustrate how you can make coax cable end terminations perfect every time. Your end result will be a highly visible and electrically sound connection as the ones shown here.
The parts used in this demonstration are as follows:
  1. Clear shrink tube 3 inches
  2. Black shrink tube 1.5 inches
  3. White shrink tube 1.5 inches lableled accordingly
  4. TNC crimp on connector
  5. RG 142 coax cable length as needed
For this demonstration cut away approximately 3/5 (.6) of an inch of the coax cable outer jacket with a very sharp razor blade and discard. Take care not to damage the braided shielding immediately beneath the jacket. Remember to always follow the manufacture specifications of cut dimensions.
Push the braided shield back taking care not to UN-BRAID the shield. Cut away approximately 1/3 of shielding braid.
MAKE SURE ALL PIECES OF HEAT SHRINK AND CRIMP FERREL ARE ON BEFORE YOU GO ANY FURTHER.
Cut off the required amount of center conductor insulation to provide for full insertion into the center pin yet still be seated against the remaining center conductor insulation. Take care not to cut into the center conductor wire.
Insert the pin onto the center conductor. Use an electronic grade solder (prefferably very small diameter solder). Apply a small amount of solder to your iron tip and with the tiny hole in the pin facing up, place the iron onto the bottom side of the pin and apply solder into the pin hole until completely filled. Try to be as fast as possible when soldering. Excessive heat will damage and or distort the center conductor and insulation.
Using a jewelers file, carefully file any excess solder around the center pin. Don't damage the center conductor insulation or file too excessively around the center pin.
Fold the braided shield back to expose the center conductor insulator. Again, DO NOT UN-BRAID the shield. Inspect the center conductor insulator for any left over strands of shield wire and remove.
To crimp this connector we will use a Daniels Mfg. Corp. HX4 crimper with the Daniels Y142 crimp die.
Insert the pin into the TNC receptacle until fully seated and slide the crimp ferrel over the braid and TNC receptacle. Crimp the ferrel onto the receptacle.
Once crimped you should have something that looks similar to this.
  1. Slide the black shrink tube all the up to cover your crimped ferrel and heat till shrunk.
  2. Wrap two turns of your choice colored tape immediately at the end of the black shrink tube (we used black in this example).
  3. Slide the white labeled shrink tube up to the edge of the tape and heat till shrunk.
  4. Slide the clear shrink tube over the tape and white label overlapping onto the black shrink and the RG142 coax And heat till shrunk.


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