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Total 8 documents matching your query.

1. Topband: How to determine impedance (score: 1): Author: Martin <dm4im@t-online.de>; Date: Wed, 24 Jan 2018 12:27:42 +0100; Topbanders, for the construction of the beverage ( a 2 wire reversible beverage, that is) from my post a few days ago i wanted to know how to measure or determine the impedance of the open wire. I st; /archives//html/Topband/2018-01/msg00259.html (7,639 bytes)
2. Re: Topband: How to determine impedance (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Thu, 25 Jan 2018 15:16:14 -0600; Hello Martin, I have other equations here: www.w0btu.com/bev_ant_impedance-math.html Other charts, matching transformer ratios, etc. are on www.w0btu.com/Beverage_antennas.html 73, Mike www.w0btu.com; /archives//html/Topband/2018-01/msg00260.html (9,030 bytes)
3. Re: Topband: How to determine impedance (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Thu, 25 Jan 2018 17:42:31 -0800; With both ends open, measure capacitance C of DUT, divide it by it's length ( C' = C/m) . Shorten one end, measure inductance of DUT, divide it by length ( L' = L/m) . Now calculate Z= 1000 * squarer; /archives//html/Topband/2018-01/msg00261.html (9,058 bytes)
4. Re: Topband: How to determine impedance (score: 1): Author: Martin <dm4im@t-online.de>; Date: Fri, 26 Jan 2018 12:27:47 +0100; Am 26.01.2018 um 02:42 schrieb Richard (Rick) Karlquist: You don't need to divide by length. You are darn right. I just verified it. I found Zo=sqrt(L/C) on a forum and thought this can't be right be; /archives//html/Topband/2018-01/msg00262.html (9,402 bytes)
5. Re: Topband: How to determine impedance (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Fri, 26 Jan 2018 07:59:57 -0800; Another line Z measurement technique is with a scope and reasonably fast risetime (few nsec) pulse generator. Terminate about a 20' length of line with a variable non-inductive pot or carbon comp res; /archives//html/Topband/2018-01/msg00264.html (11,174 bytes)
6. Re: Topband: How to determine impedance (score: 1): Author: "John Kaufmann" <john.kaufmann@verizon.net>; Date: Fri, 26 Jan 2018 12:34:22 -0500; Here's another method that's based on the engineering textbook transmission line equation and use of an impedance analyzer to make an impedance measurement. You can look up the transmission line equa; /archives//html/Topband/2018-01/msg00266.html (11,333 bytes)
7. Re: Topband: How to determine impedance (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Mon, 29 Jan 2018 09:13:15 -0800; What I used for data transmission line Z finding was a pulse gen, scope and variable resistor (non inductive). A fast risetime pulse reflects very clearly on the scope at the source. When the termina; /archives//html/Topband/2018-01/msg00274.html (11,971 bytes)
8. Re: Topband: How to determine impedance (score: 1): Author: Martin <dm4im@t-online.de>; Date: Wed, 31 Jan 2018 14:35:34 +0100; Topbanders, thanks for all the valuable input. So far i can say the beverage was of great help in the past 160m contest although it still is not optimized. At DL0WH, we didn't work much, we rather te; /archives//html/Topband/2018-01/msg00301.html (8,298 bytes)

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