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Total 72 documents matching your query.

21. Re: [Amps] plate choke (score: 1): Author: Tony King - W4ZT <amps@w4zt.com>; Date: Thu, 14 Apr 2005 10:15:28 -0400; I agree with Rich that fiberglass tube is by far the least costly material and is commonly available. It may come down to a matter of comparing the minimum order from your supplier with the cost of a; /archives//html/Amps/2005-04/msg00275.html (8,892 bytes)
22. Re: [Amps] plate choke (score: 1): Author: Richard Measures <r@somis.org>; Date: Thu, 14 Apr 2005 08:29:22 -0700; I epoxy the tube to a square of flat G-10 that I notch with an adjustable circle-cutter and a drill. ... and high prices with me. Rich Measures, 805.386.3734, AG6K, www.somis.org ____________________; /archives//html/Amps/2005-04/msg00277.html (9,888 bytes)
23. Re: [Amps] plate choke (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Thu, 14 Apr 2005 12:23:32 -0400; You can get solid rod in G-10 too. Also, one might look at Glastic which is the redish pink fiberglass material out now. They have it in sheet and rod. They also make standoffs with it. I'm not sure; /archives//html/Amps/2005-04/msg00278.html (10,963 bytes)
24. [Amps] Plate Choke (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Thu, 14 Apr 2005 13:08:01 -0400; I find that hams are really a cheap bunch. Anyone that calls $35 for a 1 foot piece of 1-1/2 PTFE, which is enough to make 2 plate chokes, must be on welfare, and if you're in that situation, you sho; /archives//html/Amps/2005-04/msg00282.html (7,470 bytes)
25. [Amps] Plate Choke (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Wed, 10 Aug 2005 06:43:36 +0100; All, I just finished sacrificing 12" of Teflon bar stock to the 2xGS35b project this evening. The result is a 320uH inductor in 2 sections. I will sweep the unit tomorrow at work and report back with; /archives//html/Amps/2005-08/msg00363.html (6,597 bytes)
26. [Amps] Plate Choke (score: 1): Author: "Bob Good" <k4bg@planters.net>; Date: Mon, 15 Aug 2005 15:41:50 -0400; Can someone help with specs on a UTC model PA-1C Plate Choke? Thanks /73, Bob K4BG _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/ma; /archives//html/Amps/2005-08/msg00534.html (6,548 bytes)
27. Re: [Amps] Plate Choke (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Thu, 25 Aug 2005 07:29:57 +0100; Progress on testing the choke: 2 series resonance dips in the 30MHz spectrum. 1st dip at 7.1MHz and second at 14.3MHz, clean above and below. Tested on grounded Al plate with coils normal (vertical); /archives//html/Amps/2005-08/msg00665.html (8,006 bytes)
28. Re: [Amps] plate choke (score: 1): Author: "Roy Koeppe" <royanjoy@ncn.net>; Date: Thu, 25 Aug 2005 06:52:32 -0500; If... "Reactance at 1.8MHz = 3099 Ohms" Then, With 3 kv on the plates, circulating current through the choke winding and through the by pass cap is 1 amp? You see, this is a useless parameter. Circul; /archives//html/Amps/2005-08/msg00666.html (6,886 bytes)
29. Re: [Amps] plate choke (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 25 Aug 2005 05:14:58 -0700; With a 3kV anode supply, The peak change in anode potential is c. 2700v-pk 0.707 x 2700v = c. 1900V-rms, so the circulating current through the HV-RFC is 1900v / 3099-ohms = 0.616A-rms Not quite sinc; /archives//html/Amps/2005-08/msg00667.html (8,167 bytes)
30. Re: [Amps] plate choke (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Thu, 25 Aug 2005 14:44:46 +0100; So, Are you telling me that at every operating frequency of the amp I have to design the plate choke so that it has a parallel resonance? That is impossible without adding some sort of tuning mechani; /archives//html/Amps/2005-08/msg00669.html (9,550 bytes)
31. Re: [Amps] plate choke (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 25 Aug 2005 09:52:55 -0400; Tom, All you have to do is make sure it's not resonant on one of the operating bands. If it is, you can park that frequency somewhere else by adding or subtracting a few turns of wire. To check its r; /archives//html/Amps/2005-08/msg00670.html (10,779 bytes)
32. Re: [Amps] plate choke (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 25 Aug 2005 11:42:53 -0400; Tom, I should have added earlier that if the choke will work at the lowest frequency, it will on every other higher frequency, providing it isn't resonant at one of them. In other words, you design t; /archives//html/Amps/2005-08/msg00671.html (12,800 bytes)
33. Re: [Amps] plate choke (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 25 Aug 2005 11:55:35 -0400; See Below, ** REPLY SEPARATOR ** Most of the time in engineering, one tries to at least double the working value if possible. So one that would handle 1-1.2 amperes would be what to use. I've seen th; /archives//html/Amps/2005-08/msg00672.html (9,855 bytes)
34. Re: [Amps] plate choke (score: 1): Author: "Roy Koeppe" <royanjoy@ncn.net>; Date: Thu, 25 Aug 2005 11:49:59 -0500; Said, "...Circulating current is limited by parallel resonances in the winding, At 1.8MHz, with a typical Ham amplifier - I don't think so..." Follows is published data pertaining to Ohmite plate cho; /archives//html/Amps/2005-08/msg00673.html (7,853 bytes)
35. Re: [Amps] plate choke (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 25 Aug 2005 13:15:42 -0400; Roy, You have to watch about using Ohmites information. The reason being is their chokes aren't wound with copper wire, but are with resistance wire. That has a big thing to do with self resonance, o; /archives//html/Amps/2005-08/msg00674.html (9,727 bytes)
36. Re: [Amps] plate choke (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 25 Aug 2005 10:20:36 -0700; It suspect that they are talking about the Rp component as it relates to the ohmic losses (read self-heating) of the choke. For Xp = 3000 ohms, Rp would be well in excess of 200,000 ohms even for a m; /archives//html/Amps/2005-08/msg00675.html (8,884 bytes)
37. Re: [Amps] plate choke (score: 1): Author: "Roy Koeppe" <royanjoy@ncn.net>; Date: Thu, 25 Aug 2005 14:00:58 -0500; Hmmm, "It suspect that they are talking about the Rp component as it relates to the ohmic losses (read self-heating) of the choke. For Xp = 3000 ohms, Rp would be well in excess of 200,000 ohms even; /archives//html/Amps/2005-08/msg00676.html (9,150 bytes)
38. Re: [Amps] plate choke (score: 1): Author: "Alex Eban" <alexeban@bezeqint.net>; Date: Thu, 25 Aug 2005 21:15:40 +0200; Hi , guys. A quick look in the Will Orr's radio bible shows that in a 160 meters amplifier the RF choke is about millihenry! (23rd edition, page 17-5). This is the reason commercial amplifiers use ch; /archives//html/Amps/2005-08/msg00677.html (9,457 bytes)
39. Re: [Amps] plate choke (score: 1): Author: "Alex Eban" <alexeban@bezeqint.net>; Date: Thu, 25 Aug 2005 21:21:53 +0200; Soory everyone! I should have stated that the choke in Will Orr's book had a value of 4 (four) millihenry! Alex 4Z5KS _______________________________________________ Amps mailing list Amps@contesting; /archives//html/Amps/2005-08/msg00678.html (8,359 bytes)
40. Re: [Amps] plate choke (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 25 Aug 2005 12:44:18 -0700; It would appear that you are correct, Roy. I just looked at Bill Orr's info on plate choke design (Radio Handbook 23rd edition, page 12-6). While I knew that series resonant points needed to be avoid; /archives//html/Amps/2005-08/msg00679.html (9,336 bytes)

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