Subject: [TowerTalk] Corroded copper conductivity?
From: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Tue, 28 Aug 2007 09:58:12 -0400
List-post: <mailto:towertalk@contesting.com>
Has anyone measured corroded copper inductor Q vs. shiny new copper at
HF frequencies?
Specifically, I wonder if there'd be any practical benefit to
polishing and coating a 3/4" copper pipe transmitting magnetic loop
with coil varnish?
The capacitor is a Jennings vacuum variable and the silver-plated cap
clamps have been soldered to the loop using solid silver plated copper
strap, so I don't have a particularly lossy capacitor arrangement.
I also know that shiny new copper vs. shiny new silver wouldn't make
much difference. What I don't know is the conductivity penalty of
corroded copper.
The loop is just a fun experiment since I had the capacitor burning a
hole in my junkbox but I'm interested in seeing how well I can get it
to work vs. my larger antennas.
73,
Dan
Not exactly what you are looking for, but might be of interest.
http://g7rau.demon.co.uk/sm5bsz/antennas/sa/losses413.htm
--
Gerald Boutin, VE1DT
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