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341. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Mon, 24 Jul 2006 08:54:41 -0400; Maybe he meant Angstroms. 10 atmospheres would be almost 150psi. 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm; /archives//html/Amps/2006-07/msg01009.html (9,601 bytes)
342. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Mon, 24 Jul 2006 17:05:50 -0400; I have a 2000T that I hope to use some day. It is the largest vacuum Glass tube I have seen. It will be interesting to see how much gas is in it or not in it. 73 Bill wa4lav _________________________; /archives//html/Amps/2006-07/msg01031.html (15,280 bytes)
343. Re: [Amps] Arc distance and plasma (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 28 Jul 2006 11:00:29 -0400; I had just gotten some odd tubes on ebay (4x-500) which were basically 4x500 tubes with a 4-400 base. I figured that they were bad but thought I'd just try them on my tube tester anyway. I lit up the; /archives//html/Amps/2006-07/msg01237.html (8,259 bytes)
344. Re: [Amps] Question on an amp. (score: 1): Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>; Date: Mon, 31 Jul 2006 23:51:39 -0400; That is why you may consider a grid-driven AB1 tetrode for the final or maybe for the driver, so that you can get lots of gain in one stage or two if you insist that the output be grounded grid. 73 B; /archives//html/Amps/2006-07/msg01454.html (7,343 bytes)
345. Re: [Amps] Checking for IMD (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 11 Aug 2006 10:59:17 -0400; An oscillator, good mixer and a sound card running FFT should work. You want to mix the RF down to around 10 kHz ( center of the sound card frequency range) and observe sidebands around it. You can u; /archives//html/Amps/2006-08/msg00397.html (9,514 bytes)
346. Re: [Amps] Checking for IMD (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 11 Aug 2006 17:38:47 -0400; I always have a problem when it comes to trying to make perfect measurements when in reality it is the entire system that counts. That is to say if you exciter is good enough to put on the air and yo; /archives//html/Amps/2006-08/msg00418.html (10,890 bytes)
347. Re: [Amps] Checking for IMD (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 15 Aug 2006 08:53:57 -0400; Now we are back to my first suggestion. Use a good mixer and local oscillator to feed a sound card. If you don't need more than 20kHz bandwidth you don't need the quadrature oscillator and mixers whi; /archives//html/Amps/2006-08/msg00503.html (11,163 bytes)
348. Re: [Amps] Anodizing aluminum, painting etc. (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 17 Aug 2006 12:57:28 -0400; I have found one odd exception as far as heat sinks go. What you state is very true. Just take a look inside most inexpensive UPSs for PC computers. They usually don't have finned heat sinks but just; /archives//html/Amps/2006-08/msg00530.html (9,765 bytes)
349. [Amps] GL-6942 data (score: 1): Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>; Date: Thu, 17 Aug 2006 23:11:36 -0400; I hope someone on the list has a data sheet for this tube. The GL-6942 looks like an interesting tube. I need the data sheet so that I can test it. Thanks 73 Bill wa4lav _____________________________; /archives//html/Amps/2006-08/msg00537.html (6,293 bytes)
350. Re: [Amps] panasonic inverter TSPA (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 25 Aug 2006 08:24:54 -0400; I picked one up at Wal-Mart for $70 a year ago or so and suspected at first that the box was empty. After removing the oven I realized that the oven was about the weight as the box, glass platter and; /archives//html/Amps/2006-08/msg00651.html (7,348 bytes)
351. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 12 Oct 2006 11:57:13 -0400; Why would an amplifier need a microprocessor unless it had auto-tuning. And just by switching to manual tuning you get around the problem. _______________________________________________ Amps mailing; /archives//html/Amps/2006-10/msg00089.html (9,116 bytes)
352. Re: [Amps] 11 Meter lockout (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 13 Oct 2006 09:27:02 -0400; How about filling me in on how such a lockout works. Have you ever tried to count frequency of a voice SSB signal or a two tone one? Not easily done. Also, for a lockout to be effective and not easil; /archives//html/Amps/2006-10/msg00108.html (8,108 bytes)
353. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 13 Oct 2006 10:20:21 -0400; Not that anyone on the list would really care, but running two tubes at legal limit should reduce the IMD products (Splatter) if they were biased correctly. Lower efficiency but cleaner signal. Natur; /archives//html/Amps/2006-10/msg00109.html (9,338 bytes)
354. Re: [Amps] PEP power.. (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Mon, 16 Oct 2006 16:24:41 -0400; Every couple of years I have to drag out the following example to illustrate what RMS means and send it to AMPS. It think it is a good example and goes to show that you can't just arbitrarily call av; /archives//html/Amps/2006-10/msg00184.html (12,221 bytes)
355. Re: [Amps] Mega Amplifier? (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Sun, 05 Nov 2006 16:23:37 -0500; I had one some years ago rated 200 watts from 1MHz to 200 MHz using twelve 8122's. The power supply was quite heavy since it was intended for continuous use at about 25 percent efficiency. Looks like; /archives//html/Amps/2006-11/msg00077.html (7,887 bytes)
356. Re: [Amps] class "A" RF amp question (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 08 Nov 2006 14:54:38 -0500; Plate modulating a grounded grid amplifier is a bit difficult and if you don't modulate the driver you can fry the grid on the negative modulation peaks. When the plate voltage is near zero all the d; /archives//html/Amps/2006-11/msg00124.html (8,177 bytes)
357. Re: [Amps] AM On a linear (score: 1): Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>; Date: Wed, 08 Nov 2006 21:16:47 -0500; All of you are overlooking the fact that during the negative swing of the modulator when the plate voltage is near zero just about all the power will actually go to the grid. The same reason why you; /archives//html/Amps/2006-11/msg00134.html (7,749 bytes)
358. Re: [Amps] AM On a linear (score: 1): Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>; Date: Wed, 08 Nov 2006 21:58:02 -0500; I think you are referring to grid driven class C. But there the power supplied the grid is limited by the driver and none in going to the output. When grounded grid and normal B+ is applied most of t; /archives//html/Amps/2006-11/msg00136.html (9,251 bytes)
359. [Amps] Plasma Generator (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 10 Nov 2006 17:03:27 -0500; Just picked up a RF Power Products ICP-15 plasma generator with auto tuning etc. This is a 1600 watt CW 40.68 MHz (3x 13.560) RF generator. Does anyone have any information on this solid state device; /archives//html/Amps/2006-11/msg00143.html (6,713 bytes)
360. [Amps] Fwd: Plasma Generator (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 10 Nov 2006 17:42:42 -0500; Correction, RF PLASMA Products It appears to have inside the generator two amplifiers, power combiner and lowpass filter along with big dc power supply. Nice digital control panel as well. 73 Bill wa; /archives//html/Amps/2006-11/msg00144.html (6,889 bytes)

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