Connectors for 3/4" Aluminum hard line.


Image Copyright Roger Halstead 2003

 

This Idea came from Bill (N8FUZ) and this particular pair of connectors were made by Bill.

 
The construction of the connectors is quite simple.

You start with a standard 3/4" compression coupling and it is cut in half as shown to the right. I don't have a complete compression coupling, or one cut in half, on hand, but you should get the idea.

Standard  BRASS, "barrel connectors" (Female to Female) are used to create a female UHF connector. This allows connecting a standard PL259 directly.

Clean the threads off one end of the barrel connector.  Starting at the end of the compression fitting where it was cut in half, drill a hole that is a tight fit for the barrel connector.  Even a press fit, or interference fit is fine. Insert the barrel connector until the face of the end with the threads removed is flush with the inside of the compression fitting as shown at left.

The joint between the compression fitting and the barrel connector is then soldered..

To prepare the 3/4" hard line, carefully cut the shield back far enough so that when the dielectric is removed the center connector will go into the barrel connector about 3/8" to 1/2" when the shield is inserted all the way into the compression end of the fitting..  In other words, make it a good fit.  The center connector is not soldered. 

A little "Pentrox", or dielectric grease on the shield where it contacts the brass might be a good idea

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