How to Attach a Crimp-On BNC Connector

Assembling the Straight BNC Male Connector with the Coaxial Cable

1. This section describes how to assemble the straight BNC male connector with the coaxial cable.

Tools, Equipment, and Materials

1. Coaxial cable, whose components are shown in FIGURE 4-15.

   Straight BNC male connector, whose components are shown in FIGURE 4-15.

   Figure 4-15 BNC connector and coaxial cable procedure

1. 1. Strip off the sleeve of the coaxial cable according to the coaxial cable materials and sizes shown in FIGURE 4-16. The external conductor, insulation, and internal conductor should be exposed as shown in FIGURE 4-16, TABLE 4-5lists the recommended length of the reserved external conductor (L1), reserved insulation (L2), and stripped sleeve (L3).
      Figure 4-16 Stripping off the coaxial cable
      
      
      • When stripping off the sleeve of the coaxial cable, do not scratch the external conductor.
      • You can also determine the stripping size according to the size of the connector. Refer to.
      Table 4-5 Stripping size of the common coaxial cables

      Cable Type Label for the NM cable	External Diameter of the Coaxial Cable	L1 (mm)(in.)	L2 (mm)(in.)	L3 (mm)(in.)	Remarks
      SYFVZ-75-1-1(A)	2.2 mm (0.09 in.)	5-6 (0.20-0.24)	7-9 (0.28-0.35)	10-12 (0.39-0.47)	-
      SYV-75-2-2	3.9 mm (0.15 in.)	5-6 (0.20-0.24)	7-9 (0.28-0.35)	10-12 (0.39-0.47)	National trunk 155M-I
      SYV-75-4-2	6.7 mm (0.26 in.)	5-6 (0.20-0.24)	7-9 (0.28-0.35)	10-12 (0.39-0.47)	National trunk 155M-III
      SFYV-75-2-1	3.2 mm (0.13 in.)	5-6 (0.20-0.24)	7-9 (0.28-0.35)	10-12 (0.39-0.47)	National trunk -II
      SFYV-75-2-2	4.4 mm (0.17 in.)	5-6 (0.20-0.24)	7-9 (0.28-0.35)	10-12 (0.39-0.47)	National trunk 155M-II

      Figure 4-17 Size of the straight BNC male connector and stripping size of the coaxial cable
      
      

   2. Successively lead the heat shrink tube and crimping sleeve through the coaxial cable, as shown in.
      Figure 4-18 Leading the heat shrink tube and crimping sleeve
      
      

   3. Unfold the external conductor of the coaxial cable to a trumpet shape, as shown in.
      Figure 4-19 Unfolding the external conductor of the coaxial cable
      
      

   4. Insert the insulation and internal conductor into the connector plug of the coaxial cable. The external conductor of the coaxial cable partly wraps the external conductor of the connector, as shown in.
      Figure 4-20 Inserting the straight BNC male connector into the coaxial cable
      
      

   5. Use a welding tool to weld the internal conductor of the coaxial cable with the internal conductor of the coaxial cable connector, as shown in.
      Figure 4-21 Welding the internal conductor
      
      

   6. Push the crimping sleeve toward the connector. Crimp the external conductor of the coaxial cable tight. Use a crimping tool to tighten the crimping sleeve and coaxial cable connector, as shown in.
      Figure 4-22 Crimping the external conductor
      
      

   7. Use a heat gun to blow the heat shrink tube so that the tube can tightly clad the crimping sleeve, as shown in. In this way, the straight BNC male connector is assembled with the coaxial cable.
      Figure 4-23 Blowing the heat shrink tube