Nickel is also difficult to solder to.73,Gary K9GS
-------- Original message --------From: "jim.thom jim.thom@telus.net"
<jim.thom@telus.net> Date: 8/2/25 2:53 PM (GMT-06:00) To:
towertalk@contesting.com Subject: [TowerTalk] Loading Coils Date: Fri, 1 Aug
2025 15:19:10 -0700From: David Gilbert <ab7echo@gmail.com>To:
towertalk@contesting.comSubject: Re: [TowerTalk] Loading CoilsNickel has about
4 times worse electrical conductivity compared tocopper, and the skin depth at
30 MHz is about 20 times thinner (about 12microns for copper versus about 0.65
for nickel).? ChatGPT tells me thatstandard nickel plating is roughly 5 to 10
microns thick , and that evenlow cost nickel plating is typically 1 to 2
microns thick.The math agrees with you.I wonder if anyone has made measured
comparison of his coils versus asimilar copper one.Dave? ?AB7E## nickel
plated, He's joking right ? Years ago, I replaced the silverplated copper
tubing coil in a hb amp with an IDENTICAL aluminum tubingtank coil. Talk
about HOT.Nickel ? You may as well douse it with lighter fluid, and toss in
thezippo.Measure the Q of the nickel plated coil vs the copper coil, or
silverplated copper coil......and you will be in for a rude awakening.Nickel is
worse than phosphor bronze. I just ran a typ 160m coil throughK6STI's ' coil'
software....and using copper the Q was 1222. Withphosphor bronze, it dropped
to 464.....and nickel plated is even worse ! (aluminum was a Q of 857 using
3003-0 alloy).No doubt he wanted nickel so it was weather resistant.I wind my
own copper tubing coils....then silver plate em.Jim
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