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1. Topband: Re: Coax capacitor losses (score: 1): Author: John Kaufmann <john.kaufmann@verizon.net>; Date: Fri, 17 Dec 2004 10:42:15 -0500; Let me update my earlier post about losses in coax lines, where I cautioned people about using them as reactance elements (capacitors or inductors). If you are familiar with the Smith Chart, you can; /archives//html/Topband/2004-12/msg00235.html (8,425 bytes)
2. Re: Topband: Re: Coax capacitor losses (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Fri, 17 Dec 2004 11:48:38 -0800 (PST); You also need to know how much of the loss is due to dielectric loss tangent vs conductor resistance. For a matched 50 ohm line at 1.8 MHz, the dielectric loss is negligible. However, it may be signi; /archives//html/Topband/2004-12/msg00242.html (7,713 bytes)
3. RE: Topband: Re: Coax capacitor losses (score: 1): Author: "John Kaufmann" <jkaufmann@alum.mit.edu>; Date: Fri, 17 Dec 2004 22:09:39 -0500; When I refer to "loss resistance" in my earlier post, I am really referring to an equivalent loss resistance that accounts for power dissipation from all physical mechanisms. It models as a resistanc; /archives//html/Topband/2004-12/msg00246.html (8,787 bytes)
4. RE: Topband: Re: Coax capacitor losses (score: 1): Author: "Richard (Rick) Karlquist (N6RK)" <richard@karlquist.com>; Date: Fri, 17 Dec 2004 20:40:09 -0800; You cannot calculate "loss resistance" using only a Smith chart, and the dB/ft loss specs. Instead of just dB/ft, you need to know conductor resistance per foot and dielectric conductance per foot. R; /archives//html/Topband/2004-12/msg00247.html (8,096 bytes)
5. RE: Topband: Re: Coax capacitor losses (score: 1): Author: "Carel, pc5m" <pc5m@xs4all.nl>; Date: Sat, 18 Dec 2004 15:55:12 +0100; Is not a rule of thumb to use: Just use the dB/m loss on the frequency of interest the actual length of the coaxial stub ? Example RG8, @1Mhz loss 0.5 dB/100ft (@10MHz: 1.5 dB) Length stub = 20 ft, w; /archives//html/Topband/2004-12/msg00248.html (9,972 bytes)
6. RE: Topband: Re: Coax capacitor losses (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 18 Dec 2004 10:30:10 -0600; On Fri, 17 Dec 2004 20:40:09 -0800, Richard (Rick) Karlquist (N6RK) wrote: But you had better use a Smith chart for at least part of the design work. Based on its length and the frequency at which it; /archives//html/Topband/2004-12/msg00250.html (8,423 bytes)
7. Re: Topband: Re: Coax capacitor losses (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 20 Dec 2004 00:58:00 -0500; actual length of the You cannot accurately use dB loss from wire tables when the transmission line is very short in terms of wavelength and especially when the line is used as a capacitor. First, th; /archives//html/Topband/2004-12/msg00260.html (8,467 bytes)
8. Re: Topband: Re: Coax capacitor losses (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 20 Dec 2004 01:03:59 -0500; I agree! Loss is not equally proportioned between conductor and dielectric losses. The line is also very short with virtually infinite SWR. You have to know the voltages, currents, dielectric loss p; /archives//html/Topband/2004-12/msg00261.html (8,455 bytes)
9. RE: Topband: Re: Coax capacitor losses (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Mon, 20 Dec 2004 07:54:13 -0600; Whenever I have needed a capacitor in a hurry, such as on a DXpedition or during a contest I have used coaxial cable. If the amount of capacitance is very high, say, a few hundred pF, then I use a nu; /archives//html/Topband/2004-12/msg00268.html (8,639 bytes)
10. Topband: Re: Coax capacitor losses (score: 1): Author: "Peter Wardenier" <Peter.Wardenier@asml.com>; Date: Wed, 22 Dec 2004 14:29:29 +0100; I think the truth is somewhere in the middle, depending on your personal taste. First, let's repeat some of the math on lossy transmission lines, or better, have a look at http://www.sm.luth.se/~urb; /archives//html/Topband/2004-12/msg00277.html (9,701 bytes)
11. Topband: Re: Coax capacitor losses (score: 1): Author: "Peter Wardenier" <Peter.Wardenier@asml.com>; Date: Thu, 30 Dec 2004 10:59:18 +0100; Summary: - coax stubs make quite acceptable capacitors @ 1.8 MHz - the remaining -call it theoretical- discussion: are the added losses just 'low', (see my previous post), or are they completely negl; /archives//html/Topband/2004-12/msg00345.html (10,866 bytes)
12. Re: Topband: Re: Coax capacitor losses (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 30 Dec 2004 10:08:54 -0500; independent of the coax only; up to some 10m @ directly influenced by the coax simulators erroneously for the stub length approaching zero! version (applet) by W9CF, http://fermi.la.asu.edu/w9cf/tra; /archives//html/Topband/2004-12/msg00350.html (10,855 bytes)

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