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81. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 3 Sep 2006 23:53:09 +0100; That wasn't the point I was making at all! An L, Pi, Pi-L, T or similar network can be analysed, explained and designed in complete detail without ever using the concept of "resonance", so for these; /archives//html/Amps/2006-09/msg00061.html (9,394 bytes)
82. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: R L Measures <r@somis.org>; Date: Sun, 3 Sep 2006 04:59:35 -0700; Not according to a dipmeter. For example, when a lo-pass configuration Pi-network with a Q of 10 is tuned up, a dipmeter shows that it is resonant about 7% lower in frequency. If an L-network was res; /archives//html/Amps/2006-09/msg00062.html (9,381 bytes)
83. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: R L Measures <r@somis.org>; Date: Sun, 3 Sep 2006 11:03:20 -0700; XL = XC isn't rigorous enough on your side of the pond? R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists; /archives//html/Amps/2006-09/msg00063.html (9,186 bytes)
84. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 04 Sep 2006 08:21:57 +0100; Fourier's ideas don't explain it? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-09/msg00064.html (11,084 bytes)
85. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 4 Sep 2006 11:26:31 +0200 (CEST); It isn't on your side either, unless you're willing to accept an approximation that falls over completely for low Q in anything other than series circuits. If you use the definition that resonance is; /archives//html/Amps/2006-09/msg00065.html (8,701 bytes)
86. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Mike Sawyer" <w3slk@uplink.net>; Date: Mon, 4 Sep 2006 08:46:20 -0400; Peter, Show me concrete evidence that the voltage and current are not in phase when XL=XC. Basic AC theory demonstrates that resonance is the point where all that's left is Z=R, where R is the DC res; /archives//html/Amps/2006-09/msg00066.html (9,442 bytes)
87. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 4 Sep 2006 15:22:05 +0200 (CEST); Show me concrete evidence that the voltage and current are not in phase when XL=XC. Basic AC theory demonstrates that resonance is the point where all that's left is Z=R, where R is the DC resistance; /archives//html/Amps/2006-09/msg00067.html (10,965 bytes)
88. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Mike Sawyer" <w3slk@uplink.net>; Date: Mon, 4 Sep 2006 09:51:43 -0400; Whoa Nellie! The way reactances are taught here are: XL) XL=2*p*f*L where as p= 3.14 (for all practical purposes), f= frequency, and L= inductance in henries. Then XL is the reactive component in ohm; /archives//html/Amps/2006-09/msg00068.html (8,892 bytes)
89. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Jim Forsyth" <jim@forsyth.net>; Date: Mon, 4 Sep 2006 07:39:29 -0700; The problem is your courses only taught a superficial view of the subject based upon approximations. Peter is describing exact circuit analysis results and he is correct. Jim, AF6O __________________; /archives//html/Amps/2006-09/msg00069.html (9,145 bytes)
90. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Mon, 04 Sep 2006 10:40:26 -0400; Those are the same formulae used to determine the Pi tank circuit. One also has to remember that though Rload is static, Ranode is dynamic. Best, Will _______________________________________________; /archives//html/Amps/2006-09/msg00070.html (9,770 bytes)
91. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Jim Forsyth" <jim@forsyth.net>; Date: Mon, 4 Sep 2006 08:13:34 -0700; Yes, it's not only possible it is the norm, as has been discussed here endlessly over the years. Only in the case of a series RLC (and a few special cases of parallel circuits) will Xl and Xc be nume; /archives//html/Amps/2006-09/msg00071.html (8,858 bytes)
92. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Jim Forsyth" <jim@forsyth.net>; Date: Mon, 4 Sep 2006 09:17:36 -0700; It's OK that you don't have an understanding of the principles of physics as applied to electrical engineering and circuit analysis. Just know that there are limitations to the approximate methods y; /archives//html/Amps/2006-09/msg00072.html (8,839 bytes)
93. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Karl-Arne Markstrm <sm0aom@telia.com>; Date: Mon, 4 Sep 2006 19:25:31 +0200; Peter is certainly right. I vividly remember a "dreaded" University professor that still required the late 70's electronics engineering student to account in detail for the six cases of "resonance" t; /archives//html/Amps/2006-09/msg00073.html (14,431 bytes)
94. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Jim Forsyth" <jim@forsyth.net>; Date: Mon, 4 Sep 2006 07:31:29 -0700; An easy answer to your question is a parallel circuit consisting of a series R and L in one branch and a series R and C in the other branch. This circuit has two resistances but your formula only pro; /archives//html/Amps/2006-09/msg00074.html (9,633 bytes)
95. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Mon, 4 Sep 2006 12:34:52 -0500; You don't even need a dipmeter. Most class B amps with a Pi network tank circuit do not produce maximum power output at the tune/load setting where a dip in the anode current occurs. In fact, I have; /archives//html/Amps/2006-09/msg00075.html (10,154 bytes)
96. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Martin AA6E <aa6e@ewing.homedns.org>; Date: Mon, 04 Sep 2006 13:40:40 -0400; Karl-Arne, Radio amateurs come in all levels of technical knowledge. The rule is that no matter how much you know, there's somebody who knows more than you do about any subject! Thanks for presenting; /archives//html/Amps/2006-09/msg00076.html (15,218 bytes)
97. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Mon, 4 Sep 2006 11:10:04 -0700; Rich, Unless the effective parallel R across each component is zero, this can't happen. Draw the phasor diagram. If even the Xc and Xl vectors have the same magnitude, the load resistance and the eq; /archives//html/Amps/2006-09/msg00077.html (10,374 bytes)
98. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Mon, 4 Sep 2006 13:54:16 -0700; Sorry, I meant to say "effective parallel R across each component is infinite". I was thinking conductance and forgot to invert. 73, Mike W4EF......................................... ______________; /archives//html/Amps/2006-09/msg00078.html (10,284 bytes)
99. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Mon, 4 Sep 2006 14:03:35 -0700; Even a resonant circuit with finite loaded Q will store energy and cause a dip. There is no need to invoke an infinite Q resonance to have a dip. 73, Mike W4EF........................................; /archives//html/Amps/2006-09/msg00079.html (10,481 bytes)
100. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 4 Sep 2006 19:12:52 -0400; 1.) Every circuit has R in the L and in the C branch. The inductor is especially problematic for component Q limitations 2.) Resonance has several equally correct or commonly used definitions 3.) Re; /archives//html/Amps/2006-09/msg00083.html (8,475 bytes)

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