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21. Re: [Amps] grid resonance (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Thu, 03 Aug 2006 07:01:43 -0700; ORIGINAL MESSAGE: -- REPLY SEPARATOR -- In an earlier post you said "Series resonances, which mean the grid is most effective, will show up on a GDO." Your post above says the opposite. Did you mis-s; /archives//html/Amps/2006-08/msg00089.html (9,118 bytes)
22. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 3 Aug 2006 17:31:32 -0400; -- REPLY SEPARATOR -- In an earlier post you said "Series resonances, which mean the grid is most effective, will show up on a GDO.">> That's correct, because it is not a lunmped two compoennt netwo; /archives//html/Amps/2006-08/msg00109.html (9,096 bytes)
23. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 3 Aug 2006 19:29:32 -0400; I've got a problem with a measurement. I wanted to compare a GDO reading with a network analyzer S12 reading, but I'm having some difficulties getting a reading on my old Heath meter. I can't get any; /archives//html/Amps/2006-08/msg00113.html (8,589 bytes)
24. Re: [Amps] grid resonance (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 03 Aug 2006 13:09:09 -0400; Chirs, Below is a link to a PDF by Tektronix titled "XYZs of Signal Sources" It may be of some help. They ask for your life history almost before you can download it, but you can give it erroneous in; /archives//html/Amps/2006-08/msg00124.html (10,429 bytes)
25. Re: [Amps] grid resonance (score: 1): Author: R L Measures <r@somis.org>; Date: Thu, 3 Aug 2006 07:15:17 -0700; Couple a dipmeter to the grid's grounding conductor, the same way one measures the resonant frequency of a 1/4 wave vertical antenna.** Below the resonance freq. of the grid, it is difficult to make; /archives//html/Amps/2006-08/msg00125.html (9,141 bytes)
26. Re: [Amps] grid resonance (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 4 Aug 2006 10:23:21 +0200 (CEST); g stage oscillate because the grid acts as a shield between the input and the output< If the grid resonance is high enough ( for example, a tube with a grid collett, and a grid 'cage' construction so; /archives//html/Amps/2006-08/msg00135.html (8,507 bytes)
27. Re: [Amps] grid resonance (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Fri, 04 Aug 2006 13:08:36 -0700; ORIGINAL MESSAGE: -- REPLY SEPARATOR -- Yes, I am. What you apparently do not understand is how a GDO works. The dip is created by the parallel resonant circuit absorbing power from the GDO's oscilla; /archives//html/Amps/2006-08/msg00150.html (10,119 bytes)
28. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 4 Aug 2006 21:43:49 -0400; A series circuit can not do this and thus can not be measured by a GDO. You can rewire the series resonant circuit in any number of ways to make it into a parallel equivalent, but then you no longer; /archives//html/Amps/2006-08/msg00155.html (9,450 bytes)
29. Re: [Amps] grid resonance (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 4 Aug 2006 20:52:08 -0700; Series resonance does not show up on a dipmeter, only parallel resonance. ... R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@conte; /archives//html/Amps/2006-08/msg00166.html (8,812 bytes)
30. Re: [Amps] grid resonance (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Fri, 04 Aug 2006 21:39:59 -0700; The bottom of the coil is connected to the chassis through the low impedance of the feed system. The vertical radiator has capacitance to the chassis (of course it has inductance, too). Sounds parall; /archives//html/Amps/2006-08/msg00167.html (9,658 bytes)
31. Re: [Amps] grid resonance (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 5 Aug 2006 08:06:39 +0100; In straight-through VHF/UHF amplifiers that have the grid ring grounded through a finger-stock collet, the 8877 is stable up to at least 432MHz. With a tuned circuit at both input and output, those a; /archives//html/Amps/2006-08/msg00172.html (9,615 bytes)
32. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 5 Aug 2006 05:43:48 -0400; So the loading coil is like a trap, and the coax sees an open circuit? The idea a GDO can sort "good resonances" that make low impedances from "bad resonances" that make high impedances seems pretty; /archives//html/Amps/2006-08/msg00176.html (10,241 bytes)
33. Re: [Amps] grid resonance (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 5 Aug 2006 11:19:14 +0100; Has anybody published a detailed analysis of how a GDO works? Bill gave a good description yesterday, but I mean something that goes deeper and includes some verifiable math. 'Coefficient of mutual i; /archives//html/Amps/2006-08/msg00178.html (10,678 bytes)
34. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 5 Aug 2006 08:13:06 -0400; I want to learn how to sort good parallel resonances from bad series-resonances and measure Q with mine! All mine seems to do is measure resonance, and it does not always do well at that. 73 Tom ___; /archives//html/Amps/2006-08/msg00179.html (9,825 bytes)
35. Re: [Amps] grid resonance (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 5 Aug 2006 14:23:26 +0200 (CEST); Actually, the GDO won't measure a parallel resonant circuit! Just consider what happens. We'll put a coil in parallel with a capacitor, and couple (magnetically) the GDO to the coil. The magnetic fie; /archives//html/Amps/2006-08/msg00180.html (8,884 bytes)
36. Re: [Amps] grid resonance (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Sat, 5 Aug 2006 07:10:28 -0700; For those interested, see http://www.aade.com/lcm2binst/coilcraft%20L%20measurement.pdf My Millen manual mentions that a grid dip meter can be used to determine Q. As I recall, that is done by determ; /archives//html/Amps/2006-08/msg00183.html (9,257 bytes)
37. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 5 Aug 2006 10:16:30 -0400; Careful Peter! The next thing you will be telling us is the GDO won't measure Q or impedances, and then some might realize what a nice house of cards can be built by misusing or misunderstanding bas; /archives//html/Amps/2006-08/msg00184.html (8,264 bytes)
38. Re: [Amps] grid resonance (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Sat, 05 Aug 2006 08:49:20 -0700; No. The vertical part has a capacitve reactance and a resistance, part of which is radiation resistance. The whole system has a lower Q than a lumped-constant parallel tuned circuit. The impedance se; /archives//html/Amps/2006-08/msg00186.html (10,819 bytes)
39. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 5 Aug 2006 13:40:50 -0400; The sharpness of the dip only gives an indication of the load impedance seen at the grid or gate. Distance, turns ratio between the oscillator coil and the DUT, and many other things determine dip d; /archives//html/Amps/2006-08/msg00192.html (10,489 bytes)
40. Re: [Amps] grid resonance (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 5 Aug 2006 13:52:07 -0400; "The Hewlett Packard HP4191A is emerging as the new standard for inductance measurements of RF coils. The HP4191A has an accuracy that can be better than 1%" I guess I won't be trading my 4191A in f; /archives//html/Amps/2006-08/msg00194.html (8,658 bytes)

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