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21. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 27 Jun 2006 14:22:53 -0400; Single tone carrier level has absolutely nothing to do with operation in a different set of conditions such as two-tone modulation at a different anode voltage, bias, and power level. You are readin; /archives//html/Amps/2006-06/msg00518.html (10,384 bytes)
22. Re: [Amps] reading a tube datasheet (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 27 Jun 2006 16:23:46 -0400; No one said that that I know of. Although I haven't been reading all the posts, at least I certainly didn't say that! What I said was someone wasn't reading the datasheet correctly and applying the; /archives//html/Amps/2006-06/msg00519.html (12,209 bytes)
23. Re: [Amps] RM ITALY HLA-150V (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 27 Jun 2006 20:41:47 -0400; Do they have output filters? Do they have a good bias system that is stable with drive level changes? Are they CB amplifiers? 73 Tom _______________________________________________ Amps mailing list; /archives//html/Amps/2006-06/msg00534.html (7,340 bytes)
24. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 27 Jun 2006 23:08:26 -0400; Not true. Even a curved line does not necessarily produce IM3 or IM5. (harmful IM3 is 2 * F1 - F2, or 2*F2-F1, IM5 is 3*F1-2*F2, 3*F2-2*F1 and so on through all odd-order products). There were two po; /archives//html/Amps/2006-06/msg00540.html (12,708 bytes)
25. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 06:23:36 -0400; Unfortunately Rich even if **you** don't believe what nearly every good electrical engineer in the world knows to be a fact, including all the people at Eimac who design tubes, it does not change an; /archives//html/Amps/2006-06/msg00544.html (10,120 bytes)
26. Re: [Amps] Really silly question (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 11:28:25 -0400; . Peter, Non-inductive is a VERY relative term. The little gold color non-inductive resistors are really quite inductive at radio frequencies. The way most of them are made internally is with two con; /archives//html/Amps/2006-06/msg00572.html (8,401 bytes)
27. [Amps] VHF arcing (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 11:32:17 -0400; For actual measurements of what REALLY happens look at: http://www.w8ji.com/demonstation.htm and http://www.w8ji.com/SB221/sb-221.htm It's very easy to prove with actual measurements anyone with mod; /archives//html/Amps/2006-06/msg00573.html (8,748 bytes)
28. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 11:45:31 -0400; 73, Tom W8JI -- > guess the question is Why does Amerritron say you can drive the tube with up to I don't remember how it would do at 130 watts drive. My ~20 year old AL1200 measures about -33dB PEP; /archives//html/Amps/2006-06/msg00574.html (9,067 bytes)
29. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 11:46:24 -0400; No, that's totally false. 73 Tom _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-06/msg00575.html (8,379 bytes)
30. Re: [Amps] Parasitic Resistors (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 11:53:52 -0400; It depends on the resistor, but I would not use them. In many cases they are too inductive. Most parasitics in tubes like the 3-500Z actually occur up around 180-200MHz. The exact frequency varies w; /archives//html/Amps/2006-06/msg00576.html (8,050 bytes)
31. Re: [Amps] Parasitic Resistors (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 11:58:19 -0400; Metal compositions for light duty. Ohmite type OX and OY Carbon compositions like glo-bars for those big illegal amps. ....... if one is needed at all. 73 Tom _______________________________________; /archives//html/Amps/2006-06/msg00577.html (7,651 bytes)
32. [Amps] VHF suppression systems (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 13:50:33 -0400; Suppressing a tube that oscillates on 180-200MHz without hurting the resistor on 50MHz can be a problem. I can think of three ways to do it: 1.) For a single band 50MHz amplifier, you might try a pa; /archives//html/Amps/2006-06/msg00592.html (9,544 bytes)
33. Re: [Amps] HLA-150 information page (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 15:42:11 -0400; Hi Ken, I hope you don't take offense at this, but.......some comments about your review: 1.) That amp is not a switching mode amplifier, and not being switch mode it can't possibly have 80% efficie; /archives//html/Amps/2006-06/msg00598.html (9,362 bytes)
34. Re: [Amps] HLA-150 information page (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 15:48:41 -0400; I did a check on some bands a few months ago and results were terrible. See: http://www.w8ji.com/rm-11306.htm I think it is becoming a worry. Anything being sold or promoted should be tested for IM; /archives//html/Amps/2006-06/msg00599.html (7,253 bytes)
35. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 16:09:21 -0400; It can be proven beyond a doubt if it is possible to get a VHF arc in any amplifier. It only takes a little logical thinking, and a little test equipment to measure voltage levels through the system; /archives//html/Amps/2006-06/msg00602.html (10,070 bytes)
36. Re: [Amps] HLA-150? Nevermind. (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 17:08:31 -0400; Ken, Why not send the amp down here? I'll run some spectrum tests on it and we'll see how it is and ship it back UPS within two days. It just can't be between July 12th through 18th because we are c; /archives//html/Amps/2006-06/msg00604.html (7,918 bytes)
37. [Amps] Mirage (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 28 Jun 2006 20:32:06 -0400; The one of the last things I did was redesign the Mirage 160 watt amp. The old Mirage amps were a disaster. They had .01uF disk caps from collector to ground to attempt to stabilize them, and ratty; /archives//html/Amps/2006-06/msg00609.html (9,206 bytes)
38. [Amps] Bandswicth failure (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 29 Jun 2006 05:35:13 -0400; Rich replied: Another technical misstatement. The SB-220 switch is from the same Centralab family used in the lower voltage Ameritron amps, Dentron amps, and many other places. Like any switch, it ha; /archives//html/Amps/2006-06/msg00619.html (9,650 bytes)
39. Re: [Amps] IM distortion and such (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 29 Jun 2006 12:00:33 -0400; I'm not sure how other companies do it, but looking at various operating conditions was standard practice for Heath and early Ameritron. I guess the answer is how many time-consuming homework assign; /archives//html/Amps/2006-06/msg00633.html (10,138 bytes)
40. Re: [Amps] Ideal bandswitch brand for 3 kW out am? (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 30 Jun 2006 05:20:10 -0400; We couldn't possibly know the ideal bandswitch anyway based only on mode, frequency, and power. There isn't enough information. 73 Tom _______________________________________________ Amps mailing lis; /archives//html/Amps/2006-06/msg00655.html (7,728 bytes)

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