Application of Heat-shrinkable Double-wall Tube in Cable Fixing of Radio Frequency Coaxial Connector

- Mar 13, 2019-

Today, we use the general method, steps, tools and inspection items of RF coaxial connectors to find out where to use thermal shrinkable double-walled tubes in the process of fitting flexible and semi-rigid RF connectors.

1. Mounting tools

1.1 Soft Cable Pressing Tool

The flexible cable clamp matched with the cable can be crimped with the diameter of 2.5-10.5 mm flexible cable. It is suitable for all kinds of RF coaxial connectors using the above cables.

1.2 Semi-rigid Cable Assembly Tool

Semi-rigid cable assembly tools are suitable for SMA RF coaxial connectors to install semi-rigid cables such as SFT-50-2 (RG405/U) and SFT-50-3 (RG402/U). Other types of RF coaxial connectors to install semi-rigid cables can refer to the above tools.

2. Installation methods and procedures

2.1 Installation Method of Soft Cable

Stripping: Stripping according to the size specified in the product drawings can be done with stripping clamp tool or blade, but the core wire, inner and outer insulation layer and shielding layer of the cable must not be damaged. At the same time, the hot shrinkable double-walled tube with adhesive should be prepared for reserve.

B. Welding inner conductor: Install wire clamp and sheath, and weld inner conductor to cable core with solder with melting point above + 125 degree C. Be careful not to burn the cable insulation.

C. External conductor crimping: clamp the clamp into six sides with clamps to make the shield of the cable in good contact with the external conductor.

D. Install the heat-shrinkable double-wall tube: blow the hot air evenly with a blower gun, and shrink the apparent heat-shrinkable double-wall tube.

2.2 Installation Method and Procedure of Semi-rigid Cable

A. Stripping: Stripping with lathe or special tools according to drawings and stripping dimensions.

B. Solder: Solder with a melting point of + 150 C should be used to weld external conductors and solder with a melting point of + 125 C to weld internal conductors.

3. Inspection items

Contact resistance, insulation resistance and dielectric withstand voltage test should be done to check whether there is leakage of bare wires. Thermal shrinkable double-wall pipe should be used to seal and protect the interface.