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41. [Amps] TenTec+Nichrome (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Sat Mar 29 07:58:41 2003; There is a hairpin strip inductor instead of a coil, but there's no mention of the material anywhere in the web pages or the manual. Yes, very well thought out. -- 73 from Ian G3SEK 'In Practice' co; /archives//html/Amps/2003-03/msg00918.html (8,115 bytes)
42. [Amps] AL-80A troubleshooting (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Feb 4 04:37:53 2003; One of you is talking about electromotive force, the normal meaning of "EMF". The other is talking about an electromagnetic field, usually abbreviated "EM field". -- 73 from Ian G3SEK 'In Practice' c; /archives//html/Amps/2003-02/msg00056.html (8,058 bytes)
43. [Amps] Re: Voodoo "EMF' forces from grid current pulses (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Feb 4 10:42:52 2003; Fine - so where *did* the force come from that bent it? Eric has just shown that the EM force between two parallel wires is about 1/1000 of an ounce for the conditions he assumed (two 1in wires separ; /archives//html/Amps/2003-02/msg00065.html (10,480 bytes)
44. [Amps] Russian tubes GS35b et al. (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Feb 4 11:47:19 2003; It seems to be mostly that the published curves don't extend into the areas you need to draw useful load lines, or to prepare a data file for KD9JQ's analysis program. You can make quite good estimat; /archives//html/Amps/2003-02/msg00071.html (9,027 bytes)
45. [Amps] Question on Ameritron amp wattmeter circuit (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Fri Feb 7 04:30:48 2003; Bruene, who invented the circuit, described it in QST in April 1959 but for some reason the description has never found a permanent place in the handbooks. About a year ago I summarized Bruene's orig; /archives//html/Amps/2003-02/msg00134.html (8,477 bytes)
46. [Amps] Russian tubes GS35b et al. (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Fri Feb 7 04:30:52 2003; Sorry for the delay in replying to this... Mostly; but see below. The ARRL Handbook gives a formula that seems to work rather better: RL = Vp/(K*Ip) where K is a variable that replaces the "2" to acc; /archives//html/Amps/2003-02/msg00135.html (13,636 bytes)
47. [Amps] Question on Ameritron amp wattmeter circuit (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Fri Feb 7 07:06:34 2003; Sorry, that link should have been: www.ifwtech.co.uk/g3sek/in-prac/best-of.htm#bruene (One day I'll learn never to post a link without testing it...) -- 73 from Ian G3SEK 'In Practice' columnist for; /archives//html/Amps/2003-02/msg00139.html (7,692 bytes)
48. [Amps] Re: Voodoo "EMF' forces from grid current pulses (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Fri Feb 7 08:47:01 2003; Exactly 15A - good guess! However, a significantly larger current would be needed to fuse #28 wire with the single short pulse we're talking about here. You may have answered your own question - elec; /archives//html/Amps/2003-02/msg00146.html (9,877 bytes)
49. [Amps] Voodoo Magnetic Fields (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Sat Feb 8 03:04:11 2003; That is clear from Eric's calculation. If you can describe the scenario, you can predict the force. Please may we see a calculation? -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB) Edi; /archives//html/Amps/2003-02/msg00165.html (8,548 bytes)
50. [Amps] Voodoo Magnetic Fields (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Sat Feb 8 03:04:14 2003; From the evidence of the scissors, the cables were in a very large stray field, so you could expect the force to be greater. Ye cannae escape the laws o' physics! -- 73 from Ian G3SEK 'In Practice' c; /archives//html/Amps/2003-02/msg00166.html (9,171 bytes)
51. [Amps] Capacitance Amount Formula (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Mon Feb 10 10:16:51 2003; Jeff's solution is the one given in Horowitz & Hill, 'The Art of Electronics' and probably many other practically-oriented college texts. It is a good first cut at the problem, and applies quite well; /archives//html/Amps/2003-02/msg00221.html (10,176 bytes)
52. [Amps] Voodoo Magnetic Fields (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Feb 11 06:23:02 2003; Since you persistently refuse to understand how a getter works, or to accept that arcs can happen in tubes that appear perfectly good, you're unlikely to find much evidence to change your mind. -- 73; /archives//html/Amps/2003-02/msg00243.html (9,149 bytes)
53. [Amps] Voodoo Magnetic Fields (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Feb 11 13:42:13 2003; We keep going around this argument in cycles of a few months; and every time you act as if nobody had ever explained all this before. I am only explaining it this time for the sake of any new arrival; /archives//html/Amps/2003-02/msg00258.html (14,599 bytes)
54. [Amps] Voodoo Magnetic Fields (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Wed Feb 12 18:07:37 2003; 'Handbook of Materials and Techniques for Vacuum devices' by Walter H Kohl (AIP Press / Van Nostrand Reinhold, 1967, ISBN 1-56396-387-6) will tell you more than you ever wanted to know. It includes a; /archives//html/Amps/2003-02/msg00306.html (10,612 bytes)
55. [Amps] Voodoo Magnetic Fields (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Wed Feb 12 18:07:42 2003; I got the old phys chem textbooks out of the attic and calculated that the mean speed of a typical light gas atom originating at a temperature of about 500C is of the order of 1000 m/s. That means th; /archives//html/Amps/2003-02/msg00307.html (10,198 bytes)
56. [Amps] Series Capacitor Strings in HV Supplies (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Thu Feb 27 08:01:15 2003; There are lots of electrolytic strings out there with "equalizing" resistors that are too high to be effective, yet the electrolytics don't seem worried about it. That does rather tend to prove your; /archives//html/Amps/2003-02/msg00492.html (7,551 bytes)
57. [Amps] RE: Problems with Heath SB-220 (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Thu Jan 23 04:12:55 2003; Agreed... but so far we have been focusing on switching capacity. The other issue is the effect on T/R timing and RF arcing in the amp's antenna relay. The open-frame relays on most older amps are to; /archives//html/Amps/2003-01/msg00187.html (9,609 bytes)
58. [Amps] Reducing Ameritron AL-800H blower noise? (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Sun Jan 26 17:46:20 2003; [...] How do you know that? If there is a difference due to frequency, what is the physical reason for it? -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB) Editor, 'The VHF/UHF DX Book'; /archives//html/Amps/2003-01/msg00230.html (8,004 bytes)
59. [Amps] Reducing Ameritron AL-800H blower noise? (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Mon Jan 27 05:35:40 2003; Thank you for the direct quote from EIMAC. From time to time it seems a good idea to separate what EIMAC said from your own opinions about what that implies. Also EIMAC notably do *not* say anything; /archives//html/Amps/2003-01/msg00236.html (10,647 bytes)
60. [Amps] Reducing Ameritron AL-800H blower noise? (score: 170): Author: G3SEK at ifwtech.co.uk (Ian White, G3SEK); Date: Tue Jan 28 16:12:19 2003; I tried to send this message yesterday... See below... Sorry, but none of that theory ties-in with what VHF/UHF amplifier users know about the same tubes. The grid "monopole" is heavily capacitively; /archives//html/Amps/2003-01/msg00271.html (14,033 bytes)

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