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81. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 7 Nov 2005 18:50:34 +0100; Have also seen this used in the Granger 172-2 MF/HF 5 kW amplifier. Two 100 ohm Globar resistors were placed near the anode cooler of the P-290A, with one end grounded and the other end "floating". T; /archives//html/Amps/2005-11/msg00097.html (10,684 bytes)
82. Re: [Amps] hit a wall on bi-directional couplers (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 20 Nov 2005 10:15:23 +0100; Transformer coupled broad-band directional couplers are notoriously difficult to construct. The reasons for this are that you have conflicting goals in the transformers, one is that a high secondary; /archives//html/Amps/2005-11/msg00365.html (13,844 bytes)
83. Re: [Amps] Ouch - 23 Ohms ? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 11 Dec 2005 19:08:31 +0100; The only way I know about to find out the design impedance of a directional coupler if you can't "reverse engineer" it, is to terminate the main line with a variable resistance, connect a test signal; /archives//html/Amps/2005-12/msg00120.html (11,775 bytes)
84. Re: [Amps] Designing the Cleanest Linear with RF Negative Feedback (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 17 Dec 2005 12:11:15 +0100; In theory, you can measure transmitter IMD at the receiver output, but in the real world this also results in influences of the receiver in-band IMD characteristics. Only few HF receivers are specifi; /archives//html/Amps/2005-12/msg00219.html (18,369 bytes)
85. Re: [Amps] Designing the Cleanest Linear with RF Negative Feedback (score: 1): Author: Karl-Arne Markstrm <sm0aom@telia.com>; Date: Sat, 17 Dec 2005 16:40:43 +0100; In principle I agree, and it works as advertised when you pick off the "IF" at a sufficiently early point in the receiver so the IMD performance of the stages before the audio output does not enter t; /archives//html/Amps/2005-12/msg00225.html (18,051 bytes)
86. Re: [Amps] Designing the Cleanest Linear with RF Negative Feedback (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 17 Dec 2005 18:06:06 +0100; Neither the 4CX250 nor the 4CX10000 have any DC grid returns, which would lead to unstable DC operating points to say the least... To me this looks like drawing errors, maybe in combination with sche; /archives//html/Amps/2005-12/msg00229.html (12,643 bytes)
87. Re: [Amps] Designing the Cleanest Linear with RF Negative Feedback (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 19 Dec 2005 19:16:52 +0100; Feed-forward correction is a very powerful, but somewhat involved distorsion reduction technique. For more information, and some worked examples, see chapter 13 "Ultra-low distorsion power amplifiers; /archives//html/Amps/2005-12/msg00264.html (13,195 bytes)
88. Re: [Amps] Calibrate a panel meter? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 28 Dec 2005 20:32:10 +0100; Usually panel meters in this range starts life as 5 mA FS movements, and then an internal shunt resistor provides the final FS value. It has been reported that the permanent magnets in d'Arsonval met; /archives//html/Amps/2005-12/msg00361.html (9,523 bytes)
89. Re: [Amps] Calibrate a panel meter? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 28 Dec 2005 21:40:44 +0100; They will read high in a non-ferrous panel, as the magnetic shunt around the poles of the stationary parts of the movement magnetic circuit provided by the steel panel will be absent. 73/ Karl-Arne S; /archives//html/Amps/2005-12/msg00364.html (9,731 bytes)
90. Re: [Amps] Drake L-4B fan - too small and too slow? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 31 Dec 2005 14:34:04 +0100; Some Amperex 3-500Z were manufactured with graphite anodes (European designation YD1130). In the Philips/Mullard databooks there was a general caution against running tubes with graphite anodes so ha; /archives//html/Amps/2005-12/msg00396.html (11,588 bytes)
91. Re: [Amps] How about this furnace? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 2 Jan 2006 18:08:50 +0100; This has been the subject of a discussion on the amps reflector about 2 years ago. To recap; In Sweden at least, almost all distribution to domestic housing is 3-phase 400V. In newly built areas (196; /archives//html/Amps/2006-01/msg00080.html (12,343 bytes)
92. Re: [Amps] Corona (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 3 Jan 2006 11:41:59 +0100; It appears to very difficult to create corona from reasonably low-Q antenna structures at sea-level. The highest Q antenna I have encountered at work, a folded dipole for 5541 kHz made out of 6 mm di; /archives//html/Amps/2006-01/msg00125.html (14,287 bytes)
93. Re: [Amps] Measuring Q with an SWR analyzer (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Thu, 5 Jan 2006 11:48:32 +0100; This can be made with simple formula, and by considering a few approximations as valid. First, the Q must be "reasonable", this means that Q will have to be at least 5 - 6, second the frequency excur; /archives//html/Amps/2006-01/msg00179.html (10,719 bytes)
94. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 9 Jan 2006 18:11:22 +0100; The primary reason why negative feedback reduces IMD is that it reduces the curvature of the transfer functions of the active devices. By feeding a portion of the output back to the amplifier input i; /archives//html/Amps/2006-01/msg00279.html (11,875 bytes)
95. Re: [Amps] Components Causing Distortion in Amplifiers (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 10 Jan 2006 08:00:45 +0100; "Amperex 8179, which may be similar to the 4-400" The 8179 or QB5/2000 is actually more of an European 4-1000A. It has comparable plate voltage and plate dissipation ratings, and is specified for lin; /archives//html/Amps/2006-01/msg00312.html (12,424 bytes)
96. Re: [Amps] Burn-in for Eimac? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 17 Jan 2006 12:25:32 +0100; If I understand the physics correctly, the zirconium getter simply dissolves and binds the gas molecules in its own molecule structure. An interesting treatment of getters in general can be found in; /archives//html/Amps/2006-01/msg00422.html (10,473 bytes)
97. Re: [Amps] Burn-in for Eimac? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 17 Jan 2006 21:22:16 +0100; I now more throughly understand that "gettering" involves the very complicated discipline of "surface physics" which appears to be some kind of "twilight zone" between chemistry and physics. The word; /archives//html/Amps/2006-01/msg00432.html (11,985 bytes)
98. Re: [Amps] Tuned Input (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 22 Jan 2006 12:19:45 +0100; The reason why the type of input tuned circuit in a GG amplifier becomes critical is that the input and output circuits are effectively connected in series. This means that the plate current pulses a; /archives//html/Amps/2006-01/msg00501.html (18,137 bytes)
99. [Amps] Tuned input (score: 1): Author: <sm0aom@telia.com>; Date: Tue, 24 Jan 2006 09:16:54 +0100 (MET); The reason for short-circuiting the harmonic currents in the cathode circuits is that they would cause voltage drops over the cathode circuit if not bypassed. As the cathode and plate circuits effect; /archives//html/Amps/2006-01/msg00576.html (8,527 bytes)
100. Re: [Amps] Tuned input (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 24 Jan 2006 18:08:45 +0100; As the tube input impedance in GG is non-linear, the input circuit also helps in reducing phase distorsion caused by non-linear loading of the driver stage. This is elaborated in some detail in chapt; /archives//html/Amps/2006-01/msg00580.html (11,961 bytes)

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