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41. [AMPS] AL1500 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 5 Dec 2001 22:34:24 +0000; That's not very specific... and what exactly do you mean by an "interrupt transistor"? So you do have difficulty in naming even one specific circuit, then? -- 73 from Ian G3SEK Editor, 'The VHF/UHF D; /archives//html/Amps/2001-12/msg00125.html (10,107 bytes)
42. [AMPS] Re: 6m amp blocking caps (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 5 Dec 2001 22:54:09 +0000; They do not develop a new parallel resonance due to being connected together. And later: Certainly - these are all *series* resonances with their self-inductance (plus the inductance of the wire you; /archives//html/Amps/2001-12/msg00138.html (10,210 bytes)
43. [AMPS] AL1500 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 6 Dec 2001 12:47:50 +0000; Thanks for providing some concrete information, Paul. So the way it's normally meant to operate is that grid current flows down through R3, and when the voltage drop exceeds about 0.6V it turns on Q2; /archives//html/Amps/2001-12/msg00141.html (12,154 bytes)
44. [AMPS] AL1500 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 6 Dec 2001 13:18:07 +0000; [...] Sorry - "R3" should be R20, everywhere. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: http://www.conte; /archives//html/Amps/2001-12/msg00142.html (9,754 bytes)
45. [AMPS] Re: 6m amp blocking caps (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 6 Dec 2001 16:42:34 +0000; If anyone other than Rich feels that I have not explained clearly enough in pervious postings why this is *not* a parallel resonance, I will try again. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Bo; /archives//html/Amps/2001-12/msg00150.html (9,264 bytes)
46. [AMPS] Re: 6m amp blocking caps (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 7 Dec 2001 07:28:06 +0000; I already did: connect a 50 ohm resistor in parallel, and sweep the SWR analyzer for the lowest SWR. Details are in the MFJ analyzer manuals, which are downloadable. -- 73 from Ian G3SEK Editor, 'The; /archives//html/Amps/2001-12/msg00165.html (8,656 bytes)
47. [AMPS] AL1500 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 7 Dec 2001 11:06:06 +0000; Paul Christensen wrote (regarding the Alpha PA-77): After downloading the PA-77 manual and schematic (from the excellent "Boat Anchor Manuals" site, http://bama.sbc.edu) it seems that the circuit is; /archives//html/Amps/2001-12/msg00166.html (11,068 bytes)
48. [AMPS] AL1500 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 7 Dec 2001 12:03:28 +0000; The break time of a fuse depends crucially on the size of the overload. Remember that a fuse operates in a very simple way, by heating up a piece of very thin wire until it melts. For the fastest bre; /archives//html/Amps/2001-12/msg00167.html (11,678 bytes)
49. [AMPS] Transformer Current ratings (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 15 Dec 2001 15:00:07 +0000; Only indirectly. Weight is a rough indication of core cross-section, which is important but still only one factor in the transformer's overall performance. The rule of thumb was "Size of a six-pack =; /archives//html/Amps/2001-12/msg00234.html (12,015 bytes)
50. [AMPS] Transformer Current ratings (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 15 Dec 2001 18:09:44 +0000; Me too! -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@c; /archives//html/Amps/2001-12/msg00239.html (9,067 bytes)
51. [AMPS] PSU program (score: 1): Author: G3SEK@ifwtech.com (Ian White); Date: Sat, 15 Dec 2001 18:10:44 +0000; My, that was quick! Fortunately, yes :-) Information on highlighting and changing components is actually in the Help file... somewhere. To keep the same type of component but change its parameter val; /archives//html/Amps/2001-12/msg00240.html (11,728 bytes)
52. [AMPS] Transformer Current ratings (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 17 Dec 2001 13:28:07 +0000; The *effective* secondary resistance - including the contribution from the primary - is the value that should be used in calculations. If the primary resistance is too low to measure accurately (whic; /archives//html/Amps/2001-12/msg00295.html (9,607 bytes)
53. [AMPS] Inductors (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 18 Dec 2001 08:25:29 +0000; It works fine in 50MHz amplifiers, with no noticeable heating in the shorted turn if it is made from continuous copper (eg a slice from a seamless tube, or a disk with a hole punched out). The shorte; /archives//html/Amps/2001-12/msg00321.html (8,782 bytes)
54. FW: [AMPS] Bypassing Screen of 4cx800a for 50 MHz (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 20 Dec 2001 19:37:42 +0000; That's how you find out that the Varistor wasn't substantial enough. The choice between a Varistor and a spark-gap protector isn't always so clear-cut. The Varistor can start to conduct and provide p; /archives//html/Amps/2001-12/msg00400.html (11,757 bytes)
55. [AMPS] another myth on EMF (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 5 Nov 2001 21:16:37 +0000; The methodology is to stick a pin in the map and draw a circle round it. Then you count the number of cancers inside that circle and compare with the national average. If you draw a circle big enough; /archives//html/Amps/2001-11/msg00059.html (10,547 bytes)
56. [AMPS] Constant Voltage (Sola) Transformer wanted (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 13 Nov 2001 17:05:21 +0000; Tom's right - the CVT would probably need to be several times more massive than the B+ transformer. This looks like a case for either a regulated B+ supply which can compensate for changes in both ma; /archives//html/Amps/2001-11/msg00235.html (9,032 bytes)
57. [AMPS] Coil Forms (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 14 Nov 2001 07:43:51 +0000; There was once an article in Ham Radio which described how to make B&W-like coil stock using two or four flat strips of fibreglass, glued on with epoxy. It should give better high-temperature perform; /archives//html/Amps/2001-11/msg00244.html (10,965 bytes)
58. [AMPS] Gi7B Tube Amps (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 15 Nov 2001 22:26:28 +0000; One big slotted nut, leaving a round flat surface and a threaded post. The original anode cooler is sand-cast, with a relatively small number of fins, so it really isn't very effective and transferri; /archives//html/Amps/2001-11/msg00271.html (9,648 bytes)
59. [AMPS] Gi7B Tube Amps (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 16 Nov 2001 08:02:41 +0000; Pure water is essentially non-conductive, so you only need reasonably long inlet and outlet leads using plastic tubing. On entry and exit to the RF deck, these coolant leads pass through grounded met; /archives//html/Amps/2001-11/msg00280.html (9,756 bytes)
60. [AMPS] Gi7B Tube Amps (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 16 Nov 2001 13:02:00 +0000; I was thinking about what's needed for low seal temperatures and long life. Peter's experience only shows that his tube survives... but these Russian tubes have very wide production variations. If th; /archives//html/Amps/2001-11/msg00283.html (10,097 bytes)

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