In article ,
Richard Clark wrote:

then the wire will work harden and break

Copper?

That's my experience, and a few minutes of Google-searching the Web
comes up with numerous references stating that copper does suffer from
work hardening after cold-deformation. The extent depends on the
purity of the copper and on what other metals it has been alloyed
with. [Lead is apparently one of the few metals not subject to work
hardening.]

This process can be reversed by annealing, but that's a bit tricky to
do if the copper is already part of a coaxial cable :-)

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

On Sun, 28 Mar 2004 18:55:40 -0000, (Dave Platt)
wrote:

copper does suffer from
work hardening after cold-deformation.

For an HT application?

The extent depends on the
purity of the copper

Generally 99.95% or better for simple wire. Copper pipe is another
matter, but for an HT application?

and on what other metals it has been alloyed
with. [Lead is apparently one of the few metals not subject to work
hardening.]

And the lead amalgam (with tin) is the MOST likely to be found - for
an HT application.

Work hardening would require a severe kink, about the same radius of
the wire. The insulation is going to limit that bend to easily ten
times that, and typical practice to 100's of times that. And as for
repetitive (the work part of the hardening) stress, maybe for an
automatic door opener, but for an HT application? The topic
application is for jumper connections where the SMA connector is far
more likely to fail.

C'mon, now guys, let's worry about what is likely to break, not about
everything that might fail. May as well take out an
asteroid-collision policy.

73's
Richard Clark, KB7QHC

On Sun, 28 Mar 2004 19:33:36 GMT, Richard Clark
wrote:

C'mon, now guys, let's worry about what is likely to break, not about
everything that might fail. May as well take out an
asteroid-collision policy.

True.

But a couple of weeks ago, March 18th, an asteroid about 100 feet in
diameter missed the Earth by 26,500 miles.

Better pay up the premiums on that policy.

Happy trails,
Gary (net.yogi.bear)
------------------------------------------------
at the 51st percentile of ursine intelligence

Gary D. Schwartz, Needham, MA, USA
Please reply to: garyDOTschwartzATpoboxDOTcom

On Sun, 28 Mar 2004 18:55:40 -0000, (Dave Platt)
wrote:

In article ,
Richard Clark wrote:

then the wire will work harden and break

Copper?

That's my experience, and a few minutes of Google-searching the Web
comes up with numerous references stating that copper does suffer from
work hardening after cold-deformation. The extent depends on the
purity of the copper and on what other metals it has been alloyed
with. [Lead is apparently one of the few metals not subject to work
hardening.]

This process can be reversed by annealing, but that's a bit tricky to
do if the copper is already part of a coaxial cable :-)

With some experience working with drawing wire (and I don't mean
artistically) I can confirm that most metals, copper and silver
included, tend to work harden. OFHC copper is better than most copper
alloys.

Gold is one of the few that does not, which is why certain types of
jewelry and leaf can only be made with reasonably pure gold.

Annealing at the right temperature for the particular metal of alloy
will make it malleable again, but those temperatures are not
compatible with plastic or rubber insulations.

Happy trails,
Gary (net.yogi.bear)
------------------------------------------------
at the 51st percentile of ursine intelligence

Gary D. Schwartz, Needham, MA, USA
Please reply to: garyDOTschwartzATpoboxDOTcom

(Dave Platt) wrote in message ...
In article ,
Richard Clark wrote:

then the wire will work harden and break

Copper?

That's my experience, and a few minutes of Google-searching the Web
comes up with numerous references stating that copper does suffer from
work hardening after cold-deformation. The extent depends on the
purity of the copper and on what other metals it has been alloyed
with. [Lead is apparently one of the few metals not subject to work
hardening.]

This process can be reversed by annealing, but that's a bit tricky to
do if the copper is already part of a coaxial cable :-)

.. . . no sweat, just run a 2M kilowatt thru the 174 and I guarantee
the center conductor will get "annealed" . .

In article ,
Brian Kelly wrote:

This process can be reversed by annealing, but that's a bit tricky to
do if the copper is already part of a coaxial cable :-)

. . . no sweat, just run a 2M kilowatt thru the 174 and I guarantee
the center conductor will get "annealed" . .

Yeah, but once the annealing has been completed, I doubt that the
cable will still have a 50-ohm characteristic impedance ;-)

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!