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41. Re: [Amps] plate choke (score: 1): Author: "Jim Forsyth" <jim@forsyth.net>; Date: Thu, 25 Aug 2005 14:06:05 -0700; Oh yes it is, you have been using an approximate equation that ignored the effect of resistance. Jim, AF6O _______________________________________________ Amps mailing list Amps@contesting.com http:; /archives//html/Amps/2005-08/msg00680.html (7,898 bytes)
42. Re: [Amps] plate choke (score: 1): Author: "Roy Koeppe" <royanjoy@ncn.net>; Date: Thu, 25 Aug 2005 16:37:51 -0500; Oh, "R is not even included as part of the L-C freq. equation." Oh yes it is, you have been using an approximate equation that ignored the effect of resistance. Jim, AF6O Jim, If I had been using HTM; /archives//html/Amps/2005-08/msg00681.html (7,703 bytes)
43. Re: [Amps] plate choke (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 25 Aug 2005 16:15:38 -0700; At the risk of sticking my foot in my mouth again, R generally doesn't effect the resonant frequency of an RLC circuit appreciably provided that the Q is reasonably high. On the other hand, a plate c; /archives//html/Amps/2005-08/msg00682.html (8,662 bytes)
44. Re: [Amps] plate choke (score: 1): Author: "Jim Forsyth" <jim@forsyth.net>; Date: Thu, 25 Aug 2005 17:39:00 -0700; This mini thread is about a case where the resistance of the inductor WAS significant and possibly DID affect the resonant frequency appreciably. Jim, AF6O ___________________________________________; /archives//html/Amps/2005-08/msg00683.html (8,269 bytes)
45. Re: [Amps] plate choke (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 25 Aug 2005 19:15:26 -0700; Yes, I understand that, Jim, but I was having a hard time believing that you could get away with deQing a choke enough to shift the resonant frequency significantly without turning it into a firework; /archives//html/Amps/2005-08/msg00684.html (9,381 bytes)
46. Re: [Amps] plate choke (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Fri, 26 Aug 2005 05:33:25 +0100; So, many of the plate chokes I have seen described in home brew amplifiers and those in use in Ameritron, Henry, Alpha and QRO are single layer wound solenoids, many like the one I built. These do no; /archives//html/Amps/2005-08/msg00685.html (10,381 bytes)
47. Re: [Amps] plate choke (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 25 Aug 2005 22:48:00 -0700; Well before today, Tomm, I would have thought the same, but after looking at Orr's Handbook, I am beginning to think otherwise. For instance Orr describes an "HF Radio Frequency Choke for Power Ampli; /archives//html/Amps/2005-08/msg00686.html (10,941 bytes)
48. Re: [Amps] Plate Choke (score: 1): Author: zl1aih@ihug.co.nz; Date: Fri, 26 Aug 2005 17:52:31 +1200; Alex said - ". Another forgotten solution is to place the feed choke at the 50 ohms end of the pi network. With 50 ohms in parallel the Q is lowered so much as to become insignificant and the frequen; /archives//html/Amps/2005-08/msg00687.html (8,318 bytes)
49. Re: [Amps] plate choke (score: 1): Author: "Alex Eban" <alexeban@bezeqint.net>; Date: Fri, 26 Aug 2005 09:48:43 +0200; The main problem stems from the 160 meters operation! For the higher bands, chokes are usually in the range of 68 to 100 microhenries. These are easily wound in a solenoid manner and if you space win; /archives//html/Amps/2005-08/msg00688.html (9,240 bytes)
50. Re: [Amps] Plate Choke (score: 1): Author: "Alex Eban" <alexeban@bezeqint.net>; Date: Fri, 26 Aug 2005 09:55:13 +0200; ...like I said, there's always the solution of changing over to a parallel tuned plate circuit with link coupling: a little more work in setting it up initially but much less of a headache in the lon; /archives//html/Amps/2005-08/msg00689.html (8,109 bytes)
51. Re: [Amps] plate choke (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 26 Aug 2005 03:41:18 -0700; A single-layer choke of up to c. 60uH will exhibit no resonances below approximately 35MHz, however, larger chokes will. Choke fires are definitely not an old wives' tale. To avoid burning one's hair; /archives//html/Amps/2005-08/msg00690.html (11,784 bytes)
52. Re: [Amps] plate choke (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 26 Aug 2005 04:00:21 -0700; I tested this idea by winding two chokes, One had a continuous single-layer, and one had various gaps as per the Handbook. The inductances were about the same and, to my surprise, so were the resonan; /archives//html/Amps/2005-08/msg00691.html (10,303 bytes)
53. Re: [Amps] plate choke (score: 1): Author: GGLL <nagato@arnet.com.ar>; Date: Fri, 26 Aug 2005 10:25:57 -0300; Alex Eban escribió: Alex, like the one shown in this site: http://sp5gjn.za.pl Best regards Guillermo - LU8EYW. _______________________________________________ Amps mailing list Amps@contestin; /archives//html/Amps/2005-08/msg00692.html (8,164 bytes)
54. Re: [Amps] plate choke (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 26 Aug 2005 11:14:59 -0400; When those soldenoid chokes were designed, first they figured for enough impedance at the lowest frequency. That decided the amount of inductance. Next, a trial choke was wound. Then, they used a gri; /archives//html/Amps/2005-08/msg00693.html (12,927 bytes)
55. Re: [Amps] plate choke (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 26 Aug 2005 11:18:46 -0400; ** REPLY SEPARATOR ** Not in the normal ham bands I doubt it. I have seen them though, well lets say in other places close. However a choke for that frequency needed to be used. It was around 22 uH s; /archives//html/Amps/2005-08/msg00694.html (13,665 bytes)
56. Re: [Amps] plate choke (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 26 Aug 2005 11:28:22 -0400; Exactly! I always thought those coils were still way too close together to do any good. The gaps are only around 1/4-1/2" apart. The theory I'd say is correct, but the design was wrong. That can be p; /archives//html/Amps/2005-08/msg00695.html (12,334 bytes)
57. Re: [Amps] plate choke (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Fri, 26 Aug 2005 10:45:31 -0500; The measurements will only be valid if you make them with the choke in place in the amp. (((73))) Phil, K5PC _______________________________________________ Amps mailing list Amps@contesting.com htt; /archives//html/Amps/2005-08/msg00696.html (9,107 bytes)
58. Re: [Amps] plate choke (score: 1): Author: Colin Lamb <k7fm@teleport.com>; Date: Fri, 26 Aug 2005 08:48:26 -0700 (GMT-07:00); When I see such lines as: It is not an old wives tale, that a poorly made choke will fail and to avoid burning your hair, park your resonances with care I see something poetic just behind the grid di; /archives//html/Amps/2005-08/msg00697.html (12,168 bytes)
59. Re: [Amps] plate choke (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Fri, 26 Aug 2005 10:51:04 -0500; Harris uses ferrite rods in their chokes, ending up with a 1.8-30 mhz unit in a small package, with no resonances. This method was written up years ago in one of the ham mags., but I forget which. (; /archives//html/Amps/2005-08/msg00698.html (9,450 bytes)
60. Re: [Amps] plate choke (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 26 Aug 2005 11:54:14 -0400; Colin, Are you sayin, "he's a poet and didn't know it"? LOL Will ** REPLY SEPARATOR ** On 8/26/05 at 8:48 AM Colin Lamb wrote: _______________________________________________ Amps mailing list Amps@c; /archives//html/Amps/2005-08/msg00699.html (12,684 bytes)

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