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Total 11 documents matching your query.

1. [AMPS] Finding the Q of a Coil (score: 1): Author: ko4nrbs@yahoo.com (Bill Smith); Date: Sat, 6 Oct 2001 20:43:05 -0700 (PDT); Hung up trying to calculate the Q of a coil I want to build. It will be 2 inches in diameter with 26 turns of #10 wire. The length is 5.3 inches. 4.9 Turns per inch. HAMCALC computes this at 11uh of; /archives//html/Amps/2001-10/msg00130.html (8,136 bytes)
2. [AMPS] Finding the Q of a Coil (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Sun, 7 Oct 2001 09:36:57 +0100; I'd say you're not going wrong. Calculating a resistance number to predict the Q can be done, but the few times I've tried it, the result hasn't matched all that well with the measured Q. Work out th; /archives//html/Amps/2001-10/msg00134.html (8,848 bytes)
3. [AMPS] Finding the Q of a Coil (score: 1): Author: 2@vc.net (2); Date: Sun, 7 Oct 2001 01:51:13 -0700; // One needs to calculate, or preferably measure, the RF-R of the wire at 29MHz. However, with #10 Cu, it should handle c. 7Arms with ok efficiency at 29MHz. With XL=2k-ohms, this is much RF-V. chee; /archives//html/Amps/2001-10/msg00136.html (8,443 bytes)
4. [AMPS] Finding the Q of a Coil (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 7 Oct 2001 08:32:56 +0100; VE3ERP (Mr HAMCALC) has produced a new version that does just what you need. The theory is described the current QEX (Sept/Oct). The download address is www.arrl.org/qexfiles/ and the file is Murphy0; /archives//html/Amps/2001-10/msg00137.html (8,800 bytes)
5. [AMPS] Finding the Q of a Coil (score: 1): Author: phil@vaxxine.com (Phil (VA3UX)); Date: Sun, 07 Oct 2001 08:50:48 -0400; Accurate calculation of RF resistance definitely is the tough part. There is more than one set of formulas from different sources for calculating this and the results don't agree. If I were forced to; /archives//html/Amps/2001-10/msg00139.html (8,805 bytes)
6. [AMPS] Finding the Q of a Coil (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sun, 7 Oct 2001 19:45:08 +0200; You are nearly right, Q is the reactance divided by the equivalent resistance, that's the sum of ohmic losses plus the RF losses. Generally speaking anyway, what counts is often the circuit Q rather; /archives//html/Amps/2001-10/msg00143.html (9,610 bytes)
7. [AMPS] Finding the Q of a Coil (score: 1): Author: 2@vc.net (2); Date: Sun, 7 Oct 2001 11:10:11 -0700; Amen, Phil. Better yet borrow a Q-meter. Simpler still, run full suds, shut down, and apply the thumb test. cheers - R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures. end -- FAQ on WWW: ht; /archives//html/Amps/2001-10/msg00145.html (8,311 bytes)
8. [AMPS] Finding the Q of a Coil (score: 1): Author: 2@vc.net (2); Date: Sun, 7 Oct 2001 11:22:31 -0700; // Good points, Mauri. - R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: a; /archives//html/Amps/2001-10/msg00147.html (8,290 bytes)
9. [AMPS] Finding the Q of a Coil (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 7 Oct 2001 16:43:13 +0100; I should have mentioned, it's all based on info from Terman. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: http; /archives//html/Amps/2001-10/msg00152.html (8,875 bytes)
10. [AMPS] Finding the Q of a Coil (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 8 Oct 2001 04:52:00 -0400; This is one of the cases I have found where you had just better measure the component. It seems is difficult if not virtually impossible to get close to actual component Q using formulas. Many thing; /archives//html/Amps/2001-10/msg00163.html (9,842 bytes)
11. [AMPS] Finding the Q of a Coil (score: 1): Author: 2@vc.net (2); Date: Mon, 8 Oct 2001 06:38:43 -0700; // I have seen too many VHF antennas where the calculated gain was different than the measured gain. It is no wonder that *QST* does not allow antenna manufacturers to make gain claims. In CB rags,; /archives//html/Amps/2001-10/msg00174.html (9,214 bytes)

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