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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+grid\s+resonance\s*$/: 90 ]

Total 90 documents matching your query.

41. Re: [Amps] grid resonance (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 6 Aug 2006 08:37:08 +0200 (CEST)
As I recall, that is done by determining the width of the dip and calculating what frequency points are at some reference level. < If you know what dip corresponds to the 3dB points, I can see that.
/archives//html/Amps/2006-08/msg00199.html (9,214 bytes)

42. Re: [Amps] grid resonance (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 6 Aug 2006 08:39:34 +0200 (CEST)
L to C ratio is very large. < Is that a general statement or one just applying to the mobile whip example? Sorry, Tom, but I don't understand: can you elucidate, please? 73 Peter G3RZP ______________
/archives//html/Amps/2006-08/msg00200.html (8,154 bytes)

43. Re: [Amps] grid resonance (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Sun, 6 Aug 2006 10:58:49 -0400
It's a general statement. A series resonant circuit doesn't change modes until the stray capacitance effectively shunting the inductor from end-to-end is equal to inductance. A short mobile antenna
/archives//html/Amps/2006-08/msg00208.html (8,460 bytes)

44. Re: [Amps] grid resonance (score: 1)
Author: Bill Turner <dezrat@copper.net>
Date: Sun, 06 Aug 2006 09:50:51 -0700
ORIGINAL MESSAGE: -- REPLY SEPARATOR -- When you include the car body, it is a parallel resonant circuit, not series. The whip is electromagnetically coupled to the car body and that makes it paralle
/archives//html/Amps/2006-08/msg00213.html (10,460 bytes)

45. Re: [Amps] grid resonance (score: 1)
Author: Bill Turner <dezrat@copper.net>
Date: Sun, 06 Aug 2006 09:57:16 -0700
ORIGINAL MESSAGE: -- REPLY SEPARATOR -- I can't believe you would say such a thing, Peter. Perhaps I missed the smiley face? :-) You are confusing the current within a component with the current with
/archives//html/Amps/2006-08/msg00214.html (8,996 bytes)

46. Re: [Amps] grid resonance (score: 1)
Author: R L Measures <r@somis.org>
Date: Sun, 6 Aug 2006 05:52:12 -0700
Who said a dipmeter measures anything but frequency? R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.co
/archives//html/Amps/2006-08/msg00216.html (10,329 bytes)

47. Re: [Amps] grid resonance (score: 1)
Author: R L Measures <r@somis.org>
Date: Sun, 6 Aug 2006 06:03:34 -0700
Which is why a 1/4 wave whip has to be shorted to dip it with a dipmeter. However, with a Trio-Kenwood dipmeter, one has the option of unshorting the whip, using the C coupling adapter and measuring
/archives//html/Amps/2006-08/msg00217.html (11,489 bytes)

48. Re: [Amps] grid resonance (score: 1)
Author: R L Measures <r@somis.org>
Date: Sun, 6 Aug 2006 06:13:04 -0700
My Trio-Kenwood dipmeter reads grid dips. For example, when it is grounded, a 3-500Z grid dips c. 88MHz . - note - With all three grid pins of a 3-500Z grounded, there is an additional dip between gr
/archives//html/Amps/2006-08/msg00218.html (10,288 bytes)

49. Re: [Amps] grid resonance (score: 1)
Author: R L Measures <r@somis.org>
Date: Sun, 6 Aug 2006 06:25:26 -0700
An L and C are in Series when one end of one is connected to one end of the other. When the remaining ends are joined, they are in Parallel. R L MEASURES, AG6K. 805-386-3734 r@somis.org _____________
/archives//html/Amps/2006-08/msg00219.html (9,657 bytes)

50. Re: [Amps] grid resonance (score: 1)
Author: "Jim Tonne" <tonne@comcast.net>
Date: Sun, 6 Aug 2006 14:18:03 -0400
Nice explanation. Hadn't looked things that way. Thanks! - JimT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp
/archives//html/Amps/2006-08/msg00222.html (9,363 bytes)

51. Re: [Amps] grid resonance (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Sun, 6 Aug 2006 14:51:23 -0400
When you include the car body, it is a parallel resonant circuit, not series. The whip is electromagnetically coupled to the car body and that makes it parallel resonant. >> What does that mean? Anyt
/archives//html/Amps/2006-08/msg00224.html (11,255 bytes)

52. Re: [Amps] grid resonance (score: 1)
Author: Vic K2VCO <vic@rakefet.com>
Date: Sun, 06 Aug 2006 13:34:50 -0700
Let's say I take a coil and connect a capacitor across it. If I couple RF into the coil from my GDO, I think you'll agree that it's a parallel circuit. Now if you open the circuit and insert, say, an
/archives//html/Amps/2006-08/msg00229.html (10,833 bytes)

53. Re: [Amps] grid resonance (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Sun, 6 Aug 2006 17:14:40 -0400
It the antenna's capacitance is indeed exclusively across the loading coil, we are in big trouble. We have lost all common mode currents and radiation resistance is zero. 73 Tom ____________________
/archives//html/Amps/2006-08/msg00232.html (9,877 bytes)

54. Re: [Amps] grid resonance (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 6 Aug 2006 23:40:39 +0200 (CEST)
of the other. When the remaining ends are joined, they are in Parallel.< Depends where the energy is injected. If it's across the circuit, then they're parallel. If it's induced into the coil, it has
/archives//html/Amps/2006-08/msg00233.html (8,423 bytes)

55. Re: [Amps] grid resonance (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Sun, 6 Aug 2006 23:48:28 +0200 (CEST)
RF into the coil from my GDO, I think you'll agree that it's a parallel circuit.< No. The current induced in the coil is in series with the coil. So the whole thing is a series resonant circuit. Or K
/archives//html/Amps/2006-08/msg00234.html (8,009 bytes)

56. Re: [Amps] grid resonance (score: 1)
Author: Steve Thompson <g8gsq@eltac.co.uk>
Date: Sun, 06 Aug 2006 23:33:02 +0100
In a finite universe I figure there's always going to be some capacitance and/or inductance and/or resistance between the 'open' ends of a series L and C, so everything is a parallel circuit. The iss
/archives//html/Amps/2006-08/msg00235.html (8,072 bytes)

57. Re: [Amps] grid resonance (score: 1)
Author: "Will Matney" <craxd1@verizon.net>
Date: Sun, 06 Aug 2006 14:24:59 -0400
Jim, According to the manual on my Heathkit HD-1250 GDO, that same parallel circuit is the basis you use to measure inductance and capacitance with a dip meter. You use the LC parallel circuit and th
/archives//html/Amps/2006-08/msg00241.html (10,556 bytes)

58. Re: [Amps] grid resonance (score: 1)
Author: "Will Matney" <craxd1@verizon.net>
Date: Sun, 06 Aug 2006 19:04:28 -0400
Peter and Vic, According to the HD-1250 Heath GDO manual, for measuring an unknown inductor I quote; (1) Connect a low value capacitor across the unknown inductor; for example 100 pF. (2) Use the dip
/archives//html/Amps/2006-08/msg00242.html (9,270 bytes)

59. Re: [Amps] grid resonance (score: 1)
Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Date: Mon, 7 Aug 2006 09:55:07 +0200 (CEST)
capacitance and/or inductance and/or resistance between the 'open' ends of a series L and C, so everything is a parallel circuit. The issue is whether it's significant.< All that does is complicate t
/archives//html/Amps/2006-08/msg00243.html (8,936 bytes)

60. Re: [Amps] grid resonance (score: 1)
Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>
Date: Mon, 7 Aug 2006 10:09:32 +0100
Surely the important thing is whether there is a CIRCUIT, in the strict literal sense of that word - a closed loop around which current can circ-u-late. Without a closed loop, no current can flow fro
/archives//html/Amps/2006-08/msg00244.html (10,414 bytes)

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