When I was experimenting on 440 MHz I made several 1/4 wave matching
sections out of 1/2 inch copper pipe. PL259s on the ends with hose
clamps on the connectors. By varying the inner conductor it was pretty
simply to construct the impedance needed.

The reason for the need was that when you stuff a military surplus
cavity to raise the frequency you also booger up (technical term) the
impedance of the system. An appropriate quarter wave section would go
a long ways toward matching 50 ohm line to antenna.

It would take a lot of motivation to construct your own hardline.

On Tue, 12 Sep 2006 07:46:18 -0700, Bill Turner
wrote:

Hardline is good stuff, right? Does anyone make their own out of
copper water pipe?

Seems doable, but have never heard of anyone doing it.

This is what happens when I have too much time on my hands. :-)
John Ferrell W8CCW