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181. Re: [TowerTalk] Loading Coils (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Fri, 1 Aug 2025 14:52:50 -0700
If you have access to a 3D printer this might be an inexpensive alternative: https://youtu.be/qAgF9Mzr8XM or https://youtu.be/S6spyk1GRoo Personally, I'd go with the version that has a slight taper. 
/archives//html/Towertalk/2025-08/msg00005.html (7,819 bytes)

182. Re: [TowerTalk] Loading Coils (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Fri, 1 Aug 2025 15:19:10 -0700
Yes ... that. Nickle has about 4 times worse electrical conductivity compared to copper, and the skin depth at 30 MHz is about 20 times thinner (about 12 microns for copper versus about 0.65 for nick
/archives//html/Towertalk/2025-08/msg00006.html (9,380 bytes)

183. Re: [TowerTalk] Loading Coils (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sat, 2 Aug 2025 14:08:47 -0700
I believe that is likely to be a more efficient approach than using an inductor.  It is possible to make air wound inductors with pretty high Q and not much loss, but the approach you used spreads th
/archives//html/Towertalk/2025-08/msg00015.html (11,803 bytes)

184. Re: [TowerTalk] Loading Coils (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sat, 2 Aug 2025 16:06:18 -0700
Yeah, amplifier coils are a different animal than antenna loading coils.  Lots different circuit impedance and lots different current levels. Still, his point is valid if you use a tank coil for a co
/archives//html/Towertalk/2025-08/msg00016.html (9,786 bytes)

185. Re: [TowerTalk] Loading Coils (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sat, 2 Aug 2025 18:06:26 -0700
Jeff, you apparently didn't even bother to check out the guy's website.  Here is a direct quote from it: "These coils are suited for amateur and commercial applications, including but not limited to
/archives//html/Towertalk/2025-08/msg00018.html (12,512 bytes)

186. Re: [TowerTalk] Loading Coils (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sun, 3 Aug 2025 00:08:09 -0700
ChatGPT mostly agrees with you, except that it says that nickel with a high phosphorus content is almost impossible to solder to even when using an aggressive acid flux. Dave   AB7E I remember lookin
/archives//html/Towertalk/2025-08/msg00020.html (11,396 bytes)

187. [TowerTalk] Loading Coils (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sun, 3 Aug 2025 11:33:34 -0700
The guy who makes the nickel plated QCoils has his email address on his website, so I just sent him an email asking him what the plating actually is.  Hopefully he answers. Dave  AB7E _______________
/archives//html/Towertalk/2025-08/msg00026.html (7,903 bytes)

188. [TowerTalk] QCoils Answered (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sun, 3 Aug 2025 13:11:37 -0700
I guess that's why we call ourselves amateurs ... Dave  AB7E _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contestin
/archives//html/Towertalk/2025-08/msg00028.html (7,608 bytes)

189. Re: [TowerTalk] QCoils Answered (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Sun, 3 Aug 2025 13:51:27 -0700
Well, it wasn't a waste from my point of view and I appreciate your search.  I learned stuff I didn't know before. Take care, Dave  AB7E Thanks for straightening us out! 73, Mike W4EF...............
/archives//html/Towertalk/2025-08/msg00030.html (8,817 bytes)

190. Re: [TowerTalk] Loading Coils (score: 1)
Author: David Gilbert <ab7echo@gmail.com>
Date: Mon, 4 Aug 2025 10:50:25 -0700
I remember that as well.  Well over $100 for even a moderately sized coil.  That's why I came up with the do-it-yourself 3D printed concept that I posted here a few days ago.  I can make exactly the
/archives//html/Towertalk/2025-08/msg00044.html (11,028 bytes)

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