### KM1H used cu tubing for his .25 wave strip lines in his 144 mhz tube amp.
The cu tubing has since turned green. Amp was built
a long time ago. Zero effect on BW or PO or gain. Amp was built > 25 yrs
ago. As long as the terminations at each end are good, you wont have any
issues.
Its when you have bad connections from corrosion or oxidization that u start
having problems
Jim VE7RF
From: dfaklis@frontiernet.net
Sent: Friday, October 14, 2016 7:30 AM
To: towertalk@contesting.com ; rxdesign@ssvecnet.com ; jim.thom@telus.net
Subject: RF resistance of copper oxides
Here's some additional reading on this topic. We typically decide to neglect
the effect, but it is non-zero.
http://g3ynh.info/zdocs/comps/part_1.html
http://rudys.typepad.com/ant/files/antenna_wire_conductor.pdf
http://k6mhe.com/n7ws/Plating.pdf
73, Dean, NW2K
---------------
...that the tarnish would be more like insulation and the current would simply
flow through the copper below (low resistance path) ...
...Dull and tarnished has zero effect...The rf current simply travels beneath
the tarnish.
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