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HOW TO FIT OUR Heliax N connectors (connector # 9001) TO 1/2" heliax coax cable 

The N heliax connectors are a push fit inner.

The outer solid copper shield is flared out during assembly of the connector on the cable which makes a very tight connection.

You will need some tools: Mini pipe cutter, box cutter, file, cable cutters, two open end spanners 19mm or 5/8"




1. Slip the heatshrink on the cable. 

Count 7 grooves from the end of the cable and with the pipe cutter score the sheath around the groove and then with the box cutter remove the sheath from the end of the cable. Press down with the box cutter rather than slice, to make the cut around the groove,  then slice a slit along the piece to be removed and with a flat blade screwdriver used as a wedge  carefully prise off the end piece of sheath. 



2.Sheath cut off at groove 7 from the end of the cable.


3. Now place the small o-ring on the 6th groove as shown.




4. Now count 4 ridges towards the end of the cable from the o-ring and with the pipe cutter cut off the end of the copper shield. Make the cut on the ridge and in the centre of it. Do this carefully. Either continue through the inner insulation with pipe cutter to cut it, or better method is to remove the pipe cutter and use the box cutter to cut through the inner insulation to the inner conductor. Press down with the box cutter rather than slice, and be careful not to cut the copper coating on the inner conductor.    


5. Remove the end of the shield  that has been cut.



6. Now cut the inner so that it is 10mm long. Use proper cable cutters which make a clean straight cut on the end.


7.  Remove any burrs from the inner cut, as it needs to fit inside the connector smoothly. Remove the o-ring if necessary to keep it safe from damage.  



8. This is what the connector looks like disassembled. But the two pieces on the left stay together. Do not separate out the inner from the outer piece.



9. This is what the inner of the connector looks like.

The inner conductor of the cable is a press fit into the centre part.



10. Now replace the small o-ring and grease it.



11. Now push the nut on to the cable with the inner piece still inside it and push it on to the cable far enough  so that the inner piece engages in the first groove from the end. Do not push it back further as these parts are difficult to remove once fitted on the cable. Then using the screwdriver flare out the copper shield against the fingers on the inner piece. Use the inner of the cable to get some purchase on the screwdriver initially using it as a lever. This flaring arrangement is what holds the cable firmly in the body of the connector and must be done carefully.



12. Now continue to flatten the copper shield against the fingers of the inner piece so that is is smoothed around it.

This is important so that the connector fits together properly.

The flared part of the shield will bind against the flared piece inside the barrel of the connector.



13. Expect a couple of splits to appear because you have stretched the copper. Make sure it is tidy and that bits won't flake  off. If you are extra careful you can usually flare it without splitting it.  



14. Now put the big o-ring on the nut, fit the main body and tighten with the spanners. Try to hold the connector from moving with the spanner on the right then tighten with spanner on the left moving the nut only and not the body of the connector, reason being that the inner of the cable is fitted to the main body in a press fit inner, and the copper shield flared outer is in compression against the flaring part in the main body and you don't want either of them to rotate. The connection needs to be dead tight. Retighten several times.



15. Now sleeve the connector and cable with the heatshrink and seal it using the heatgun. Check that the inner is not shorted to the shield using a multimeter and that both ends of the cable where two connectors are fitted have continuity between the pins. Easy !


These mini tube cutters are fairly nifty when it comes to making clean cuts. Worth their weight compared to a hacksaw and file.




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