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1. Topband: Homebrew capacitors (score: 1): Author: nekvter@hushmail.com; Date: Thu, 26 Sep 2013 12:58:42 -0400; I'm working on a project that will require 16 variable high-voltage transmitting capacitors with a maximum value of 200pF. I think it's worth reminding ourselves that a coaxial capacitor can be made; /archives//html/Topband/2013-09/msg00361.html (7,421 bytes)
2. Re: Topband: Homebrew capacitors (score: 1): Author: Jim GM <jim.gmforum@gmail.com>; Date: Sun, 29 Sep 2013 18:42:00 -0500; Could have saved more money with a Piece of RF-9913 or RG8 coax cable about 25pF per foot plenty voltage rating. Only thing can some one please help me on this, do I connect the center conductor on o; /archives//html/Topband/2013-09/msg00364.html (6,840 bytes)
3. Re: Topband: Homebrew capacitors (score: 1): Author: Bill Cromwell <wrcromwell@gmail.com>; Date: Sun, 29 Sep 2013 20:19:14 -0400; Hi Jim, When I used it I connected the center conductor at one end and the braid at the other end. The bit that I used for the small coupling capacitance was not very long. Even the short length I us; /archives//html/Topband/2013-09/msg00365.html (8,090 bytes)
4. Re: Topband: Homebrew capacitors (score: 1): Author: Richard Karlquist <richard@karlquist.com>; Date: Sun, 29 Sep 2013 19:12:12 -0700; Only thing can some one please help me on this, do I connect the center conductor on one end of the cable and use the shield on the other end? Or just use the center conductor and shield on one end,; /archives//html/Topband/2013-09/msg00366.html (7,863 bytes)
5. Re: Topband: Homebrew capacitors (score: 1): Author: Richard Karlquist <richard@karlquist.com>; Date: Mon, 30 Sep 2013 18:37:33 -0700; On 2013-09-30 17:57, ZR wrote: In the late 60's I made a coaxial capacitor from a length of RG-17 to supply most of the C for a 40M Bobtail. A little too big to fold and the losses were not even wort; /archives//html/Topband/2013-09/msg00368.html (7,664 bytes)
6. Topband: Homebrew capacitors (score: 1): Author: nekvter@hushmail.com; Date: Mon, 30 Sep 2013 13:41:15 -0400; cable about 25pF per foot plenty voltage rating. Per my original post, "I'm working on a project that will require 16 variable high-voltage transmitting capacitors with a maximum value of 200pF." I; /archives//html/Topband/2013-10/msg00004.html (8,773 bytes)
7. Re: Topband: Homebrew capacitors (score: 1): Author: "ZR" <zr@jeremy.mv.com>; Date: Mon, 30 Sep 2013 20:57:08 -0400; In the late 60's I made a coaxial capacitor from a length of RG-17 to supply most of the C for a 40M Bobtail. A little too big to fold and the losses were not even worth thinking about. On 160 with a; /archives//html/Topband/2013-10/msg00005.html (8,658 bytes)
8. Re: Topband: Homebrew capacitors (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 1 Oct 2013 12:10:06 -0400; This post is worth reading and saving for homebrewers. Not nearly enough of us understand capacitors this well. KK1L noted that there must be either an overlap or a gap in the sleeve that wraps the i; /archives//html/Topband/2013-10/msg00006.html (9,137 bytes)
9. Re: Topband: Homebrew capacitors (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 1 Oct 2013 12:25:06 -0500; Good points, as usual, Tom. Corona --besides greatly reducing the breakdown voltage-- can also generate ozone, which can gradually break down some dielectric materials. When I worked at Owens-Illinoi; /archives//html/Topband/2013-10/msg00007.html (8,085 bytes)
10. Re: Topband: Homebrew capacitors (score: 1): Author: Jim GM <jim.gmforum@gmail.com>; Date: Fri, 4 Oct 2013 09:42:52 -0500; You could use Teflon tap, it is used on plumbing pipe threads to prevent leaks. Some one once told me that 1mill thicknes was good for 1K volts. -- Jim K9TF _________________ Topband Reflector; /archives//html/Topband/2013-10/msg00031.html (6,970 bytes)
11. Re: Topband: Homebrew capacitors (score: 1): Author: Jim GM <jim.gmforum@gmail.com>; Date: Fri, 4 Oct 2013 10:13:53 -0500; You can use Coax seal in a tube thats used to fill in the gap between coax connectors to keep the moisture, which has teflon. Put that on first then wrap with teflon tap to close up your gaps. To wea; /archives//html/Topband/2013-10/msg00032.html (8,078 bytes)

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