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1. [TowerTalk] RG-58 capacitor (score: 1): Author: Tom Osborne <w7why1@gmail.com>; Date: Sun, 25 Jun 2017 15:52:37 -0700; Hi All This might seem like a silly question, but is it possible to make a 150pf capacitor out of RG-58? Thanks and I need one for an EFHW I am building. 73 Tom W7WHY ________________________________; /archives//html/Towertalk/2017-06/msg00325.html (6,411 bytes)
2. Re: [TowerTalk] RG-58 capacitor (score: 1): Author: "David Robbins" <k1ttt@verizon.net>; Date: Sun, 25 Jun 2017 19:20:44 -0500; Yes, rg58 should be about 40pf/ft. just beware, if the length becomes a significant fraction of a wavelength then you have to calculate the impedance based on the length and velocity factor. David Ro; /archives//html/Towertalk/2017-06/msg00326.html (8,006 bytes)
3. Re: [TowerTalk] RG-58 capacitor (score: 1): Author: Tom Osborne <w7why1@gmail.com>; Date: Sun, 25 Jun 2017 17:55:45 -0700; Well - talk about a brain fart - I was thinking that the capacitance was in mFd, not pF. Seesh! Easy to figure out thenI know the right nomenclature Tom W7WHY ________________________________________; /archives//html/Towertalk/2017-06/msg00328.html (8,341 bytes)
4. Re: [TowerTalk] RG-58 capacitor (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Sun, 25 Jun 2017 21:18:11 -0700; This might seem like a silly question, but is it possible to make a 150pf capacitor out of RG-58? Thanks and I need one for an EFHW I am building. Sure.. 25 pF/ft, so 6 ft. __________________________; /archives//html/Towertalk/2017-06/msg00332.html (7,562 bytes)
5. Re: [TowerTalk] RG-58 capacitor (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Sun, 25 Jun 2017 21:19:32 -0700; My table said 25 pF/ft. RG-8/rg-213 is 13pF/ft So, moral of the story is, check for the brand of your coax, and use the appropriate length. _______________________________________________ __________; /archives//html/Towertalk/2017-06/msg00333.html (8,042 bytes)
6. Re: [TowerTalk] RG-58 capacitor (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 25 Jun 2017 21:44:05 -0700; And be even more specific -- although RG-numbers originally defined many specifications for cables, that has not been true for many decades. For example, there are hundreds of cables CALLED RG8, all; /archives//html/Towertalk/2017-06/msg00334.html (9,168 bytes)
7. Re: [TowerTalk] RG-58 capacitor (score: 1): Author: "David Robbins" <k1ttt@verizon.net>; Date: Mon, 26 Jun 2017 06:40:40 -0500; Yeah, capacitance varies. The 40pf/ft was the first one I saw in my belden book, other variations were listed at 28 or 30pf/ft. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1tt; /archives//html/Towertalk/2017-06/msg00336.html (9,053 bytes)
8. Re: [TowerTalk] RG-58 capacitor (score: 1): Author: Bryan Swadener via TowerTalk <towertalk@contesting.com>; Date: Mon, 26 Jun 2017 12:05:40 +0000 (UTC); When I homebrewed a trap dipole, I used stubs of RG8-ish coax as capacitors. I trimmed the stubs using a pair of wire cutters. However, when I hit it with power, the cut end of the stubs arced. I lea; /archives//html/Towertalk/2017-06/msg00338.html (8,629 bytes)
9. Re: [TowerTalk] RG-58 capacitor (score: 1): Author: Patrick Greenlee <patrick_g@windstream.net>; Date: Mon, 26 Jun 2017 07:27:19 -0500; The capacitance per ft and simple arithmetic will get you a DC capacitance value that is reliable but add in frequency of the applied voltage and inductance rears its head. As per others, you get a s; /archives//html/Towertalk/2017-06/msg00343.html (9,150 bytes)
10. Re: [TowerTalk] RG-58 capacitor (score: 1): Author: Mike Fahmie via TowerTalk <towertalk@contesting.com>; Date: Mon, 26 Jun 2017 16:11:06 +0000 (UTC); Seems that if you need a value that would require a length that might begin to look like a transmission line stub, you could cut it into shorter sections and parallel them.-Mike-WA6ZTY From: David Ro; /archives//html/Towertalk/2017-06/msg00356.html (10,221 bytes)
11. Re: [TowerTalk] RG-58 capacitor (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Mon, 26 Jun 2017 14:39:01 -0700; This might seem like a silly question, but is it possible to make a 150pf capacitor out of RG-58? Thanks and I need one for an EFHW I am building. 73 Tom W7WHY Possible? Yes. Advisable? Not so much.; /archives//html/Towertalk/2017-06/msg00370.html (8,698 bytes)

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