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Total 14 documents matching your query.

1. [Amps] Plate choke magic? (score: 1): Author: Tomm Aldridge <KD7QAE@ARRL.NET>; Date: Fri, 28 Jan 2005 23:42:10 +0000; Why are plate chokes seemingly black magic? Don't you just want a good decoupling of the PS from the Plate; i.e. lots of impedance from DC to Light and no resonances? How I get that should not be an; /archives//html/Amps/2005-01/msg00547.html (6,700 bytes)
2. RE: [Amps] Plate choke magic? (score: 1): Author: "John Coleman" <wa5bxo@pctechref.com>; Date: Fri, 28 Jan 2005 19:57:49 -0600; A Plate RF choke always has some resonances. The idea is to keep the resonances in low Q by having low capacitance between windings, hence the occasional spacing. "High-Q" resonance at a harmonic of; /archives//html/Amps/2005-01/msg00552.html (8,939 bytes)
3. Re: [Amps] Plate choke magic? (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Fri, 28 Jan 2005 22:07:33 -0500; Tom, Actually, a ferrite core can be used if it's of the correct type of material. The material is determined by the frequency that the coil will operate at. There a couple of ferrite and iron powder; /archives//html/Amps/2005-01/msg00554.html (9,404 bytes)
4. Re: [Amps] Plate choke magic? (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sat, 29 Jan 2005 08:07:50 -0000; It might, although I think you're looking for low loss not high loss in the core material. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con; /archives//html/Amps/2005-01/msg00555.html (7,988 bytes)
5. Re: [Amps] Plate choke magic? (score: 1): Author: Tomm Aldridge <KD7QAE@ARRL.NET>; Date: Sat, 29 Jan 2005 08:22:15 +0000; Thanks Will, that makes perfect and practical sense. Plate choke valuse for 1.8 through 30MHz amplifiers need to be high enough to present a large reactance at 1.8MHz with large defined as >> greater; /archives//html/Amps/2005-01/msg00556.html (11,081 bytes)
6. Re: [Amps] Plate choke magic? (score: 1): Author: Tomm Aldridge <KD7QAE@ARRL.NET>; Date: Sat, 29 Jan 2005 08:49:52 +0000; More on the plate choke question. I just took a t200-3 core with pretty high RF losses (good) and an Al of 42.5 nH/T^2 and wound 154 turns on it to get about 1mH. Because it is a multi layer construc; /archives//html/Amps/2005-01/msg00560.html (11,962 bytes)
7. Re: [Amps] Plate choke magic? (score: 1): Author: Tomm Aldridge <KD7QAE@ARRL.NET>; Date: Sat, 29 Jan 2005 08:56:28 +0000; This guy is my god now, mainly because he agrees with me on Plate Chokes: http://www.qsl.net/kk5dr/ampbuilders.htm check out his treatise on plate chokes. Tomm Aldridge wrote: More on the plate choke; /archives//html/Amps/2005-01/msg00561.html (12,403 bytes)
8. Re: [Amps] Plate choke magic? (score: 1): Author: R.Measures <r@somis.org>; Date: Sat, 29 Jan 2005 02:48:15 -0800; "A full-wave bridge rectifier configuration is the only way to go on a quality amp" - - For RTTY-broadcasting, yes. However, since the duty-cycle for SSB is only c. 30%, a high-quality SSB linear amp; /archives//html/Amps/2005-01/msg00564.html (13,709 bytes)
9. Re: [Amps] Plate choke magic? (score: 1): Author: R.Measures <r@somis.org>; Date: Sat, 29 Jan 2005 03:01:02 -0800; On Jan 29, 2005, at 12:22 AM, Tomm Aldridge wrote: Thanks Will, that makes perfect and practical sense. Plate choke valuse for 1.8 through 30MHz amplifiers need to be high enough to present a large r; /archives//html/Amps/2005-01/msg00565.html (12,038 bytes)
10. Re: [Amps] Plate choke magic? (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Sat, 29 Jan 2005 11:56:36 -0500; On Sat, 29 Jan 2005 11:55:13 -0500, Will Matney <craxd1@ezwv.com> wrote: On Sat, 29 Jan 2005 03:01:02 -0800, R.Measures <r@somis.org> wrote: On Jan 29, 2005, at 12:22 AM, Tomm Aldridge wrote: Thanks; /archives//html/Amps/2005-01/msg00574.html (14,675 bytes)
11. Re: [Amps] Plate choke magic? (score: 1): Author: Robert Wood <rwood90@direcway.com>; Date: Sat, 29 Jan 2005 11:37:29 -0600; to the group: any comments on choke such as the RFC-3 offered by RF Parts with 225 uH 1.5A & 4 kV rating ?? any bands to avoid with this one or close by ?? 73 W5AJ More on the plate choke question. I; /archives//html/Amps/2005-01/msg00580.html (13,748 bytes)
12. Re: [Amps] Plate choke magic? (score: 1): Author: "wc6w@juno.com" <wc6w@juno.com>; Date: Sat, 29 Jan 2005 23:48:35 GMT; amps@contesting.com Hi Todd, No magic involved. A compromise was reached long ago that most ham amplifiers have employed ever since. By allowing the plate choke to carry some reactive current at its; /archives//html/Amps/2005-01/msg00590.html (9,397 bytes)
13. Re: [Amps] Plate choke magic? (score: 1): Author: Tomm Aldridge <KD7QAE@ARRL.NET>; Date: Sun, 30 Jan 2005 02:14:08 +0000; Marv, Thanks for the references, I will read them. To be clear, I was not proposing ferrite toroids but powdered iron toroids as they can support DC due to their distributed gaps. Tomm wc6w@juno.com; /archives//html/Amps/2005-01/msg00595.html (10,462 bytes)
14. Re: [Amps] Plate choke magic? (score: 1): Author: "wc6w@juno.com" <wc6w@juno.com>; Date: Mon, 31 Jan 2005 18:17:27 GMT; Hi Tomm, A powdered iron part will still need quite a few turns. For instance: 70 turns on a T-200A-2 will provide 100uH. This should be a rough equivalent to the commonly used value. Try it? Check f; /archives//html/Amps/2005-01/msg00648.html (11,485 bytes)

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