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41. Re: [Amps] fan experts (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 29 Jan 2006 16:04:49 +0000; I like the Rotron Spinnaker. DC power, so speed control is easy, it's small, reasonably quiet, reasonably priced ($50ish), bags of back pressure and capable of cooling a 8877. Steve _________________; /archives//html/Amps/2006-01/msg00684.html (8,418 bytes)
42. Re: [Amps] What blower? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 29 Jan 2006 23:03:31 +0000; A lot of the IR thermometers have a fixed emissivity setting which is wrong for glass (and maybe shiny metal). The simple fix is a patch of correction fluid like Tippex or Snopaque (?), which has pre; /archives//html/Amps/2006-01/msg00708.html (8,683 bytes)
43. Re: [Amps] cathode to ground in tetrode amp (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 30 Jan 2006 17:58:45 +0000; Might it make sense if it was 30R not 30k? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-01/msg00725.html (8,027 bytes)
44. Re: [Amps] cathode to ground in tetrode amp (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 31 Jan 2006 07:34:15 +0000; Assume that the resistor is a typo and it's meant to be 30R, not 30k - a reasonable value to give some rf nfb. The choke across it allows the dc and rf conditions to be controlled separately, without; /archives//html/Amps/2006-01/msg00756.html (9,347 bytes)
45. Re: [Amps] 3-500 / 4-400 cooling (09/10/2005) (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 31 Jan 2006 15:34:31 +0000; The 8874 data sheet specifically mentions that "the internal construction.. ..is such that heat transfer to the tube base is minimised...". Free convection is sufficient cooling. The '250 is rather d; /archives//html/Amps/2006-01/msg00768.html (9,024 bytes)
46. Re: [Amps] transformer talk (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 09 Feb 2006 14:39:50 +0000; Allowances for much higher peak current with capacitor input - the high peaks result in higher rms current, which is the value you need to use when looking at the heating effects. Many people use (sq; /archives//html/Amps/2006-02/msg00201.html (7,111 bytes)
47. Re: [Amps] transformer talk (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 09 Feb 2006 16:10:42 +0000; Steve's had one too many crispy fried transformers :-) I've also been burned (both metaphorically and literally) by attractive looking big transformers which turn out to have been designed for use wi; /archives//html/Amps/2006-02/msg00205.html (8,599 bytes)
48. Re: [Amps] transformer talk (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 09 Feb 2006 16:39:27 +0000; rms applies to any waveform - if the voltage/current are sinusoidal, then the 1.414 or .7071 factors apply. Where the waveform is a series of short peaks, then there isn't a simple numerical factor t; /archives//html/Amps/2006-02/msg00206.html (7,587 bytes)
49. Re: [Amps] transformer talk (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 10 Feb 2006 07:35:25 +0000; I agree these are the ranges of figures that 'drop out' most often - but I'd caution against automatically assuming that they cover every instance. In the last case, if you have 1.9 instead of an ass; /archives//html/Amps/2006-02/msg00215.html (8,182 bytes)
50. Re: [Amps] 87A vs. IC-PW1 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 22 Feb 2006 19:26:32 +0000; Apart from slightly raised losses in the feeder (minimal in most cases) and ATU, I think all the output power does get radiated. Steve _______________________________________________ Amps mailing lis; /archives//html/Amps/2006-02/msg00391.html (8,174 bytes)
51. Re: [Amps] QSK (okay, not QSK...) (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 24 Feb 2006 07:40:25 +0000; Going back to a question posed at the outset about relay life... The reflector is not full of people saying that QSK trashes their relays. On the other hand, my mental arithmetic (far from reliable t; /archives//html/Amps/2006-02/msg00486.html (8,383 bytes)
52. Re: [Amps] DIN stands for....? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 25 Feb 2006 08:12:59 +0000; I agree entirely, but please don't lump all Europeans together - I blame the French. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contestin; /archives//html/Amps/2006-02/msg00546.html (8,631 bytes)
53. Re: [Amps] DIN stands for....? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 25 Feb 2006 10:54:14 +0000; Even if they are, it doesn't make them innocent :-) They were behind one of the worst connectors to have been inflicted on us, and I bet they were behind pushing the EU to make it a legal requirement; /archives//html/Amps/2006-02/msg00549.html (8,572 bytes)
54. Re: [Amps] [BULK] - DIN stands for....? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 26 Feb 2006 08:00:07 +0000; As someone commented earlier, if you hunt for the right supplier, there are DIN plugs out there that don't suffer the problems everyone's listed. You can buy versions with solid metal bodies and pin; /archives//html/Amps/2006-02/msg00578.html (9,659 bytes)
55. Re: [Amps] RE : DIN stands for....? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 27 Feb 2006 15:34:23 +0000; There are two variants of 8 pin - the common one in the UK has 7 pins following something approaching a circular pattern. I had to go to a Kenwood dealer to get one for my TS830 - the 7 pins are in a; /archives//html/Amps/2006-02/msg00609.html (9,734 bytes)
56. Re: [Amps] Panel lettering, scales, dials, etc (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 27 Feb 2006 20:21:38 +0000; I've made some really nice equipment labels in anodised ally using a product called Gedakop. Use anything you like to make the text/lines etc. and print onto transparency, then it's a simple photo pr; /archives//html/Amps/2006-02/msg00635.html (7,851 bytes)
57. Re: [Amps] figuring tube output impedance (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 27 Feb 2006 20:24:23 +0000; A pedantic comment, highlighted in Conrad's reply. The output impedance of the tube isn't of major importance here. It's the load impedance presented to it that matters. The two are not the same. Ste; /archives//html/Amps/2006-02/msg00636.html (8,056 bytes)
58. Re: [Amps] confused reading amidon ferrite specs? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 08 Mar 2006 07:47:44 +0000; I'd echo Will's suggestion: http://www.communication-concepts.com/application_notes.htm and work through AR 305/313/347 for starters. I wouldn't want to discourage anyone from experimenting, but tran; /archives//html/Amps/2006-03/msg00185.html (8,827 bytes)
59. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 10 Mar 2006 10:12:04 +0000; I'm intruiged by this, and I'm wondering if I'm misunderstanding something. As I understand it, the tube doesn't oscillate in isolation - it's a combination of several factors, including the impedanc; /archives//html/Amps/2006-03/msg00238.html (8,094 bytes)
60. [Amps] Trouble in pileups? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 10 Mar 2006 10:34:30 +0000; ebay item 5825883410 - 8 of them available! Can you hear me now? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin; /archives//html/Amps/2006-03/msg00239.html (6,071 bytes)

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