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41. Re: [Amps] *** SPAM *** Re: Antenna traps (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 16 Dec 2005 15:58:31 +0100 (CET); Lets consider my original proposal, a parallel tuned circuit. Working Q is given by (let's assume an infinite component Q for the moment) XL/RL. That value of XL can therefore be made anything we wan; /archives//html/Amps/2005-12/msg00202.html (10,018 bytes)
42. Re: [Amps] Matching (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 17 Dec 2005 14:28:29 +0100 (CET); No - 'cos you're not wrong! 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-12/msg00220.html (6,958 bytes)
43. Re: [Amps] Designing the Cleanest Linear with RF Negative (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 18 Dec 2005 09:13:05 +0100 (CET); Karl-Arne's comments are very valid about receiver in band linearity. Designing an AGC stage that gives good linearity as the gain is reduced is not as easy as might be thought. Been there, done that; /archives//html/Amps/2005-12/msg00238.html (7,856 bytes)
44. Re: [Amps] Want to use a knob with a 3/8" opening on a 1/4" shaft. (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 24 Dec 2005 10:14:35 +0100 (CET); I can't remember who wanted the specail sleeve, but if you still haven't got one, drop me an email (g3rzp@g3rzp.wanadoo.co.uk) and I'll turn you out a couple over the holiday. You'll need to let me k; /archives//html/Amps/2005-12/msg00315.html (7,207 bytes)
45. Re: [Amps] 4-250a mounting (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 25 Dec 2005 21:27:11 +0100 (CET); As I understand it, the filament structure is the same as the 3-500Z. Not sure about filament to grid spacing, but I have had some go grid to filament short when hot, and that's with them mounted ver; /archives//html/Amps/2005-12/msg00330.html (7,185 bytes)
46. Re: [Amps] How about this furnace? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 2 Jan 2006 10:57:55 +0100 (CET); What puzzles me about this size amp in ham use is where you get the AC power from for it. If you ran it at full whack, you'd be needing to peak around 20kW from the mains, or around 100 amps from a s; /archives//html/Amps/2006-01/msg00047.html (8,593 bytes)
47. Re: [Amps] How about this furnace? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 2 Jan 2006 15:52:49 +0100 (CET); phases will result in 17 A per phase. I reckon from am a standard house mains inlet one can run a 30 kW amplifier and use the dishwasher, microwave and cook a decent stir fry wok at the same time.< c; /archives//html/Amps/2006-01/msg00067.html (10,882 bytes)
48. Re: [Amps] Parasitic suppressor resistor (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 2 Jan 2006 16:01:36 +0100 (CET); I've seen that size used for 30kW loads: it was in a special fitting, and had something like 300 gallons an hour of cooling water pumped over it. That's 5 gallons a minute - and these were imperial g; /archives//html/Amps/2006-01/msg00068.html (8,524 bytes)
49. Re: [Amps] Low-VHF-Q Parasitic Suppressor Retrofit Kits (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 3 Jan 2006 13:39:11 +0100 (CET); resistors in the 1.0-ohm bin,< Reminiscent of, but less serious than, the happening on the Boeing 747-400 where Boeing had mistakenly fitted a 25Amp 3 phase breaker on a circuit that should have had; /archives//html/Amps/2006-01/msg00128.html (7,499 bytes)
50. Re: [Amps] How about this furnace? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 3 Jan 2006 13:43:02 +0100 (CET); the world can a decent farm run on a single phase 230 mains?? < The farm buildings such as the dairy and pig unit have 3 phase: it's the farm dwelling houses that have single phase I doubt they'd all; /archives//html/Amps/2006-01/msg00129.html (8,562 bytes)
51. Re: [Amps] How about this furnace? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 3 Jan 2006 13:52:17 +0100 (CET); My electricity is currently 0.20 Euro for each kWH for the first 160kWH, then 0.1 Euro for each subsequent kWH. Add about 16% to turn that into US $. Maybe there are advantages to QRP................; /archives//html/Amps/2006-01/msg00130.html (8,497 bytes)
52. Re: [Amps] How about this furnace? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 3 Jan 2006 14:20:45 +0100 (CET); No, it's at least a way of life and for some, a religion! 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/list; /archives//html/Amps/2006-01/msg00133.html (8,407 bytes)
53. [Amps] neon indicators (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 3 Jan 2006 14:22:04 +0100 (CET); you mean monitoring the transformer primary.< And why? Using a SUITABLE set of series resistors and the neon gives a good warning if the bleeders have opened. The series resistors need to be a potent; /archives//html/Amps/2006-01/msg00134.html (7,307 bytes)
54. Re: [Amps] Is solid Cu 600VAC house wire, good for tank toroids? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 5 Jan 2006 10:45:51 +0100 (CET); Figure that you'll have the HV minus around 400 to 1000 volts (depending on tube etc) across the coil. PVC is pretty lossy, and nylon isn't any better. My feeling is that you're well on the way for s; /archives//html/Amps/2006-01/msg00172.html (8,027 bytes)
55. Re: [Amps] Measuring Q with an SWR analyzer (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 5 Jan 2006 10:52:54 +0100 (CET); Bill asks: Obviously, the higher the Q, the smaller the 2:1 SWR bandwidth, but is it possible to calculate it exactly?< Yes. The accuracy depends on the accuracy of the measurement of the 2:1 VSWR, a; /archives//html/Amps/2006-01/msg00173.html (7,922 bytes)
56. Re: [Amps] Is solid Cu 600VAC house wire, good for tank toroids? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 5 Jan 2006 10:55:49 +0100 (CET); Dick asked: Seen that used very succesfully - Racal did that - but it ended up being pretty thick insulation at 100 watts, so at 1500, it might not be possible. That's the very flexible silicon rubbe; /archives//html/Amps/2006-01/msg00175.html (7,622 bytes)
57. Re: [Amps] Is solid Cu 600VAC house wire, good for tank toroids? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 5 Jan 2006 11:33:13 +0100 (CET); This is very true, but a lot of CEOs (and other managers, for that matter) can't see it! 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://li; /archives//html/Amps/2006-01/msg00178.html (7,965 bytes)
58. Re: [Amps] Plate choke and bypassing (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 7 Jan 2006 16:23:59 +0100 (CET); Try figuring it this way: You have with 2500 dc around 4000v pk to pk, or about 1400 rms on the plate. If the choke reactance is say 2800 ohms, then there's 500mA of RF in the choke, and through the; /archives//html/Amps/2006-01/msg00245.html (8,592 bytes)
59. Re: [Amps] NEC-think. (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 7 Jan 2006 19:34:39 +0100 (CET); I wish these damn keyboards would learn to spell instead of relying on us humans! 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.co; /archives//html/Amps/2006-01/msg00248.html (7,800 bytes)
60. Re: [Amps] Burn-in for Eimac? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 16 Jan 2006 15:41:36 +0100 (CET); hurt before firing up a tube that's been in storage.< Are you sure that you don't need to sacrifice a virgin as well? 73 Peter G3RZP _______________________________________________ Amps mailing list; /archives//html/Amps/2006-01/msg00405.html (7,417 bytes)

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