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61. [AMPS] Conjugate match (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 3 Sep 1997 15:02:52 +0100; I still need convincing. Let's take a class A transistor to start with. Assume that the collector volts can swing from 12 down to 1 and up to 23 because of the transformer. That's 22 volts peak to pe; /archives//html/Amps/1997-09/msg00042.html (10,256 bytes)
62. [AMPS] silver plating (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 3 Sep 1997 15:13:45 +0100; Tom, Do you not think that the variation is well within the limits of measurement error - thus really proving your point that you can't tell the difference? 73 Peter G3RZP -- FAQ on WWW: http://www.c; /archives//html/Amps/1997-09/msg00043.html (8,167 bytes)
63. No subject (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 3 Sep 1997 16:49:31 +0100; Rich, bit Ah, but 'Recognized' by whom? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Probl; /archives//html/Amps/1997-09/msg00050.html (7,220 bytes)
64. [AMPS] conjugate match (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 3 Sep 1997 17:01:35 +0100; Yes - IF the power is available. But at the conjugate match, the power may well not be available or, in other words, the source impedance changes. Like the lab PSU that has a 0.1 ohm output impedanc; /archives//html/Amps/1997-09/msg00051.html (8,699 bytes)
65. [AMPS] 8875 (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 4 Sep 1997 08:57:19 +0100; Tom, Obviously parasitics, boiling gold (as opposed to boiling oil) AND gas!! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative reque; /archives//html/Amps/1997-09/msg00074.html (6,742 bytes)
66. No subject (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 4 Sep 1997 09:03:19 +0100; Tom asks In the same way as ra is for a pentode - from delta Vc over delta Ic. I gather that's the way Spice does it as well. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submi; /archives//html/Amps/1997-09/msg00075.html (7,247 bytes)
67. [AMPS] conjugate match (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 4 Sep 1997 09:07:25 +0100; ARRL aren't the only ones who prefer 'optimum load impedance' - so do Motorola! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative req; /archives//html/Amps/1997-09/msg00076.html (7,828 bytes)
68. [AMPS] silver plate (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 4 Sep 1997 14:09:13 +0100; Tom, Tom, do you live in an urban, suburban or rural area? This does make an enormous difference to the corrosion, and to the form it takes. G3SEK should be able (after all, his Ph.D was in chemistry; /archives//html/Amps/1997-09/msg00082.html (7,440 bytes)
69. [AMPS] RE:conjugate match (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 4 Sep 1997 14:17:59 +0100; Tom Ic. Usual problem - we're using the same term and understanding it as meaning different things. As Humpty - Dumpty said 'When I use a word, it means what I want it to mean'. There's an awful lot; /archives//html/Amps/1997-09/msg00083.html (7,121 bytes)
70. [AMPS] Non inductive resistors (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 8 Sep 1997 09:28:31 +0100; This is the 'Ayrton - Perry' method of winding, one of the uses for which was producing very low inductance RF resistors for signal generator attenuators by people like General Radio and Marconi Inst; /archives//html/Amps/1997-09/msg00156.html (8,836 bytes)
71. [AMPS] RE;Two questions (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 8 Sep 1997 10:48:11 +0100; DC Filaments If you run grounded cathode, passive grid with tetrodes, I don't see a problem with a cheap switcher for the fils - provided it goes into constant current, not foldback, as Rich says. It; /archives//html/Amps/1997-09/msg00157.html (8,592 bytes)
72. [AMPS] Re:Two questions (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 8 Sep 1997 11:44:16 +0100; I notice George's first question is still unanswered. Let's define terms - we've got into enough trouble on this reflector by having words mean different things to different people. mu (amplification; /archives//html/Amps/1997-09/msg00158.html (9,034 bytes)
73. [AMPS] RE:two questions (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 8 Sep 1997 15:18:09 +0100; Sorry Rich, I attributed the comment to the wrong guy, but it doesn't detract from its technical correctness and virtue. Sure - provided you proportioned everything so that the exciter can't radical; /archives//html/Amps/1997-09/msg00164.html (9,828 bytes)
74. [AMPS] RE: Two Questions. (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 9 Sep 1997 09:32:08 +0100; No, it isn't. Let Ra = plate (anode) resistance VHF-Rp = Rp = the impedance of the parasitic suppressor at the frequency in question Rl be the impedance of the tank circuit at the frequency in quest; /archives//html/Amps/1997-09/msg00183.html (8,934 bytes)
75. [AMPS] parasitic suppressors (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 9 Sep 1997 15:12:59 +0100; Looking at the N7WS figures, the thing that strikes me is the way the shunt resistance is increasing on the nichrome resisitors with frequency. If you model it as a perfect inductor with a constant s; /archives//html/Amps/1997-09/msg00192.html (7,844 bytes)
76. [AMPS] Buying a new one (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 9 Sep 1997 16:31:23 +0100; Leon, Haven't you considered building? You don't have to be Marconi, and it is possible to get a 1Kw amp down to 10 cents a watt - making the electricity bill a bigger factor than amp cost! 73 Peter; /archives//html/Amps/1997-09/msg00196.html (7,010 bytes)
77. [AMPS] suppressors (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 10 Sep 1997 10:27:12 +0100; Rich, in Any two terminal network can be described at any frequency except zero in terms of either its impedance in terms of R series and X series, or R parallel and X parallel. The choice between th; /archives//html/Amps/1997-09/msg00220.html (8,117 bytes)
78. [AMPS] suppressors (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 12 Sep 1997 10:39:15 +0100; For some time, I was mistakenly thinking that the nichrome suppressor had no shunt resistors fitted, and thus I didn't understand why it was desirable to have a steadily increasing Q with frequency.; /archives//html/Amps/1997-09/msg00262.html (7,870 bytes)
79. [AMPS] graphite anodes (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 12 Sep 1997 12:02:33 +0100; Tom, you say Looking at the 'history' in the books, they seem to have been making this point about graphite anodes for at least 60 years, so it seems a bit strange that Amperex are not putting the ef; /archives//html/Amps/1997-09/msg00267.html (7,219 bytes)
80. [AMPS] Dihydrogen monoxide (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 12 Sep 1997 15:22:13 +0100; Carl, This dangerous chemical can be easily neutralised in an organic, eco-friendly method. Take some barley grain, roast it until a light brown, grind it and boil in the dihydrogen monoxide oxide fo; /archives//html/Amps/1997-09/msg00268.html (7,720 bytes)

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