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41. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 30 Jun 2006 05:21:51 -0400; Almost never would be a more accurate way of saying it. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-06/msg00656.html (9,163 bytes)
42. Re: [Amps] Ideal bandswitch brand for 3 kW out am? (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 30 Jun 2006 10:17:21 -0400; Measured voltages breakdown of sample switches: Centralab JV-9000 series single pole contact to rotor 8.5kV contact to contact 6 kV rotor to shaft 7.5kV Progressively shorting Centralab: contact to r; /archives//html/Amps/2006-06/msg00660.html (8,872 bytes)
43. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 30 Jun 2006 11:11:45 -0400; When we can't possibly know every circumstance in the world, never couldn't apply. Besides, VHF starts at 30 MHz. An oscillation at 30MHz in a tank resonant near ten meters could be a problem since; /archives//html/Amps/2006-06/msg00666.html (9,469 bytes)
44. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 30 Jun 2006 17:48:47 -0400; Yes, but not for that reason in HF amplifiers. You'll find, if you carefully investigate component breakdown, voltage flashover point depends heavily on the shape of the conductors at different pote; /archives//html/Amps/2006-06/msg00674.html (9,395 bytes)
45. Re: [Amps] Serious transformer problem (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 1 Jul 2006 06:45:29 -0400; Boris, I can understand your frustration. It sounds like everything is identical and nothing obvious is wrong. It is not likely to be residual magnetisim since the soft iron (magnetically soft) used; /archives//html/Amps/2006-07/msg00003.html (8,565 bytes)
46. Re: [Amps] Serious transformer problem (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 1 Jul 2006 09:02:14 -0400; The Internet is like Alice's resturant. We can find almost anything we want on the Internet. A portion of it will be accurate, much will not. Especially when it is something designed to sell a certa; /archives//html/Amps/2006-07/msg00009.html (11,753 bytes)
47. Re: [Amps] Deja vu all over again (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 1 Jul 2006 09:09:24 -0400; Look at the power transformer thread. Based on 1935 technology we might still consider a Faraday shield an effective noise suppression system. Things are a much different today then they were back w; /archives//html/Amps/2006-07/msg00010.html (7,358 bytes)
48. [Amps] Parasitcs (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 1 Jul 2006 10:06:46 -0400; By itself, that isn't an accurate statement. I would say it differently. Parasitics are more common in amplifiers that have long thin leads, especially in the tubes to the grid connections. If we ex; /archives//html/Amps/2006-07/msg00014.html (11,539 bytes)
49. Re: [Amps] Mains Isolation Transformer (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 1 Jul 2006 15:09:53 -0400; Hi Dave, If it does, than something is wrong with the antenna to feedline transition, the feedline, or the feedline to station transition, or the equipment itself. There should be no power mains conn; /archives//html/Amps/2006-07/msg00022.html (10,430 bytes)
50. Re: [Amps] again (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 06:30:48 -0400; The conjugate match theorem tells us nothing about what goes on inside the source, never has...never will. The rules or limits of the theorem even state that. Anyone who thinks a match to the source; /archives//html/Amps/2006-07/msg00082.html (7,985 bytes)
51. Re: [Amps] 4CX10 000J (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 06:55:43 -0400; Most amateur transceivers are in the -30dB PEP range for low odd-order IM products. Even without ALC operation they aren't very good. With ALC they can be worse, but the duration of ALC "spits" is v; /archives//html/Amps/2006-07/msg00084.html (9,630 bytes)
52. Re: [Amps] how to estimate the Q of a tank circuit (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 07:00:52 -0400; What are you asking? About component Q or network operating Q? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-07/msg00085.html (7,449 bytes)
53. Re: [Amps] GS35B Amp 15 m Situation (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 07:19:08 -0400; That's a big tip-off of what is happening. That effect is almost always caused by the electrical length of cables and networks and what they appear like to a sensor or detector someplace upstream to; /archives//html/Amps/2006-07/msg00086.html (9,590 bytes)
54. Re: [Amps] again (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 08:22:40 -0400; Mike, Looking back at the posts it *seems to me* you are thinking the design of the tank sets the load Z at the tube. That's what I think is going on, so I'll answer that way. It really doesn't matt; /archives//html/Amps/2006-07/msg00089.html (11,777 bytes)
55. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 08:32:03 -0400; I think based on the work by SM5BSZ i think a good standard to aim for in ham transmitters would be the FCC's Part 80 maritime IMD mask standard. It requires 3rd order products to be down 30 db as re; /archives//html/Amps/2006-07/msg00091.html (9,688 bytes)
56. [Amps] Efficiency (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 14:42:31 -0400; I can only guess. Most likely the professor either never read the conjugate match theorem, didn't understand it, or thinks that anything that the only thing that every limits energy is a dissipative; /archives//html/Amps/2006-07/msg00123.html (9,921 bytes)
57. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 17:01:29 -0400; That's certainly true with very high S/N ratios on clear frequencies, assuming the people have normal hearing and speech. I can prove the best S/N ratio and readability when signal levels have less; /archives//html/Amps/2006-07/msg00132.html (10,582 bytes)
58. [Amps] Bandwidth tests (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 17:24:04 -0400; That's not true at all! Steady white noise is NOT a good test of dynamics of bias or ALC systems. As a matter of fact, it is the poorest test available for determining bandwidth problems related to; /archives//html/Amps/2006-07/msg00133.html (10,596 bytes)
59. Re: [Amps] Bandwidth tests (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 19:15:25 -0400; Joe, In order for ALC problems to be measured, you have to let the ALC actually do something meaningful. Any test that holds the ALC steady, such as a white noise or two-tone test, will not test ALC; /archives//html/Amps/2006-07/msg00152.html (11,752 bytes)
60. Re: [Amps] Bandwidth tests (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 3 Jul 2006 22:48:24 -0400; Look at how the various meters move on voice or CW. Look at how the same meters move on a white noise source, or on a two-tone test. When they dance around similar amounts and rates, the test will h; /archives//html/Amps/2006-07/msg00162.html (9,874 bytes)

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