Installation Instructions
Connectors
for HELIAX® HJ4-50, HJ4-75,
and HT4-50 Coaxial Cable
 Bulletin 237004A
Description

These connectors (N-plug, N-jack, HN-plug, and 7/8" EIA-flange) are designed for tab flaring of the outer conductor and soldering of the inner contact to the inner conductor of the coaxial cable. The HJ4-50 and HJ4-75 cables are jacketed and the HT4-50 cable in unjacketed (for high-temperature and high-power applications).

Tools and Materials
Required for Assembly
Scale Fine-toothed hacksaw
Knife Plastic head mallet
Flat file Two Wrenches: 7/8" (19 mm)
Garnet cloth
and 13/16" (18 mm)
Damp cloth Solvent: comothene, vythene,
63/67 solder with
or other nonflammable
RMA flux
cleaning fluid
Metal snips Spacing gauge (supplied)
Soldering iron (150-Watt min.)
or resistance-type soldering
unit
Notice

The installation, maintenance, or removal of antenna systems requires qualified, experienced personnel. Andrew installation instructions have been written for such personnel. Antenna systems should be inspected once a year by qualified personnel to verify proper installation, maintenance, and condition of equipment.

Andrew disclaims any liability or responsibility for the results of improper or unsafe installation practices.
Read Instructions
Thoroughly Before Assembly
1 Prepare Cable. Straighten the end of the cable for at least 10 inches (254 mm) and saw off a short section so that the cable end is square. Remove the jacket from the HJ4-50 or HJ4-75 cable to the dimension shown. Use a straight-edged piece of heavy paper wrapped around the cable to guide the cutting knife. Clean the outer conductor with solvent.

To expose the inner conductor, carefully saw through the outer conductor to the dimension shown. Make the cut shallow enough to avoid damaging the inner conductor.

Unscrew the piece of cut condutctor. Trim off the spiral spacer with a sharp knife. Use a file to remove copper burrs. Hold the cable downward and tap it to shake out any copper particles.


2 Add Gasket and Clamping Nut. For HT4-50 cable, first slide a retaining ring and support band onto the cable as shown. Then, for all cables, screw the threaded gasket onto the outer conductor and position it as shown. Apply a thin coating of silicone grease with your finger tip to the outer surface of the gasket and to the gasket sealing surface in the clamping nut. Note: The outer threads of the clamping nut must be kept free of grease.
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