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41. Re: [Amps] Vegetable oil dummy load (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Tue, 28 Feb 2006 19:19:09 +0000; Gary, I believe that to make what you did sound a lot more technical, you should have left out the detail that could be understood by all and instead cited it as an example of Pointing Vector Synthes; /archives//html/Amps/2006-02/msg00674.html (8,582 bytes)
42. Re: [Amps] Trouble in pileups? (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Fri, 10 Mar 2006 11:05:02 +0000; Steve, Nice idea - must look up what electric is required to light up the heater! I've bought some stuff from Michael in the past, but his business model puzzles me. I would have thought that demand; /archives//html/Amps/2006-03/msg00240.html (8,036 bytes)
43. Re: [Amps] Trouble in pileups? (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Fri, 10 Mar 2006 13:32:57 +0000; Steve, Thanks for the gen. That's one of my 16A mains breakers allocated then! (Of course, I wouldn't even contemplate using such a valve as it's heater power exceeds the UK, +26 dBW power limit, whe; /archives//html/Amps/2006-03/msg00245.html (7,917 bytes)
44. [Amps] Love those rules that keep us on the straight and narrow! (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Thu, 27 Apr 2006 16:54:27 +0100; Will / Jim, 97.315 looks ill drafted to me. Think I might suggest that, in addition, one shoelace should be longer than the other when constructing your 'one amp per year'. Trouble is, I can't work o; /archives//html/Amps/2006-04/msg00406.html (10,248 bytes)
45. Re: [Amps] Looking for schematic to set MRF448 into Class AB (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Wed, 31 May 2006 10:34:02 +0100; Jochen, Here is my favourite KISS version: http://www.ifwtech.co.uk/g3sek/tr-bias/tr-bias1.htm Regards. Mark. -- At 08:55 31/05/2006, you wrote: ** Mark Hill - G4FPH E-mail: g4fph@mjha.co.uk Current; /archives//html/Amps/2006-05/msg00545.html (8,538 bytes)
46. Re: [Amps] Marconi / Racal (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Thu, 08 Jun 2006 12:00:20 +0100; Adrian, If you have seen a Racal TA1823 - circa 5 ft tall rack, HF, auto tune, with a 4CX1500B in, then I can help. Regards. Mark. ** Mark Hill - G4FPH E-mail: g4fph@mjha.co.uk Current web pages at:; /archives//html/Amps/2006-06/msg00215.html (8,148 bytes)
47. Re: [Amps] Ideal bandswitch brand for 3 kW out am? (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Fri, 30 Jun 2006 18:26:48 +0100; Larry, I took the spark gap out of the Henry 27 MHz plasma generator that I converted for 14 MHz mono band operation. Mechanically it was configured to support 'calibration' by means of winding the t; /archives//html/Amps/2006-06/msg00669.html (11,130 bytes)
48. Re: [Amps] 4CX10 000J / Racal MA1723 (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Mon, 03 Jul 2006 09:18:56 +0100; Peter, Do you know how clean the synthesiser is in the MA1723? I have often wondered, as its quite an old design, but never had the equipment to measure it. The old Racal TX I use from time to time o; /archives//html/Amps/2006-07/msg00075.html (11,740 bytes)
49. Re: [Amps] 4CX10 000J (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Mon, 03 Jul 2006 09:24:24 +0100; Craig, Surely, for purity and on SSB, a Yaesu FT-1000MP Mk-V with th PA set to class 'A' would not insult too much?! Is the Rockwell even better? Regards. Mark. ** Mark Hill - G4FPH E-mail: g4fph@mjh; /archives//html/Amps/2006-07/msg00076.html (10,913 bytes)
50. Re: [Amps] 4CX10,000J / Unwanted emissions (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Mon, 03 Jul 2006 13:26:52 +0100; Craig, As Tom and others quite rightly reminds us, unwanted outputs from TX come in a wide variety of forms. I remember, many years back, doing a 160 meter contest in which (to try to gain an edge) w; /archives//html/Amps/2006-07/msg00090.html (15,228 bytes)
51. Re: [Amps] Bandwidth tests (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Tue, 04 Jul 2006 11:41:29 +0100; Folks, How about we nominate someone to make a standard recording of one or more voices and we all use that in conjunction with our respective analogue or digital long persistence phosphors? I haven'; /archives//html/Amps/2006-07/msg00168.html (9,397 bytes)
52. Re: [Amps] RF Chokes (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Mon, 17 Jul 2006 11:01:55 +0100; Peter, Looking at the 1 kW PEP Racal TX I have here, the approach the designer(s) took was to have three (solenoid) chokes in series (and at 90 degrees to one another , if I recall the physical layou; /archives//html/Amps/2006-07/msg00487.html (11,781 bytes)
53. Re: [Amps] Hi Mu correction (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Wed, 19 Jul 2006 17:06:17 +0100; Folks, Just after I was first licensed, I built an HF amp. with a pair of zero-cost, QY4-400 (tetrode strapped as triode). I put a few Volt of positive DC on the cathode to get the ZSAC to what I tho; /archives//html/Amps/2006-07/msg00638.html (10,886 bytes)
54. [Amps] Valve data sheets - excellent site (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Wed, 19 Jul 2006 17:53:05 +0100; Folks, Wow! I never expected to find the original data sheets on those old valves I just referred to so readily. Check out: http://tubedata.tigahost.com/tubedata/sheetsT.html Many thanks, whovever yo; /archives//html/Amps/2006-07/msg00639.html (6,926 bytes)
55. [Amps] Crowbar that HV! (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Thu, 20 Jul 2006 17:24:20 +0100; Folks, Talking of protection. I'm contemplating building an crowbar for the HV supply in my 3CX3000A7 PA. The PSU filter capacitor is really too large (130 uF) and the amount of energy it holds when; /archives//html/Amps/2006-07/msg00680.html (7,616 bytes)
56. Re: [Amps] Crowbar that HV! (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Fri, 21 Jul 2006 12:09:29 +0100; Marv, Peter, Ian, Ken, Thanks for the replies. It seems as if the OE5 circuit is in active service and should do the job. I will start collecting parts - the thyristors at least. As to the triggering; /archives//html/Amps/2006-07/msg00725.html (11,309 bytes)
57. Re: [Amps] Checking for IMD (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Fri, 11 Aug 2006 18:41:09 +0100; Folks, I have been meaning to try such an idea out for a while as a Friday night (less than four hours build time!) project. I have a Racal 100mW drive source that I can set to CW and pad down to dri; /archives//html/Amps/2006-08/msg00408.html (11,961 bytes)
58. Re: [Amps] Checking for IMD (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Tue, 15 Aug 2006 15:33:04 +0100; Colin, Don't prompt me to start a business making 50 Ohm Morse keys! (Of course there would be at least two models in the range - one for 100 Watt and one for 1500 Watt - and the word 'miracle' or si; /archives//html/Amps/2006-08/msg00510.html (9,290 bytes)
59. Re: [Amps] rfi (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Tue, 01 May 2007 12:55:01 +0100; Folks, Two examples I learned of recently: The first, a fixed station, using his amplifier on 40 causes the electric shower switches itself on automatically. Second, a mobile running only 100W on 80/; /archives//html/Amps/2007-05/msg00009.html (8,191 bytes)
60. [Amps] Drake L7 meter broken (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Fri, 25 May 2007 09:46:10 +0100; Folks, Posting on behalf of a friend of mine who has just acquired a NIB (new in box) L7 amplifier. The amp has fired up OK with the exception of the plate current meter in which he says the 'ferrite; /archives//html/Amps/2007-05/msg00206.html (6,920 bytes)

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