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81. Re: [Amps] 32 Volt LDMOS being superceded by 50 V? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 12 Sep 2012 14:50:19 +0000; Pat, Are 32 V LDMOS amplifier transistors becoming scarce, or hard to find, as spares, due to the newer 50V LDMOS taking over new designs? I would say that definitely the trend is toward higher volta; /archives//html/Amps/2012-09/msg00237.html (10,510 bytes)
82. Re: [Amps] Sad News for Eimac Users (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 24 Sep 2012 21:33:05 +0000; John, Then I asked the Eimac distributor, Richardson Electronics, for a price and availability quote. Item Qty Part Number Br Unit Price Extension Delivery 1 1 3CX1200A7 EI 1,625.00 1,625.00 18 Weeks; /archives//html/Amps/2012-09/msg00280.html (11,244 bytes)
83. Re: [Amps] Sad News for Eimac Users (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 02 Oct 2012 15:52:58 +0000; Gene, I am puzzled as to why the solid-state devices seem to be more linear than tubes ("fire-FET's"?). As I understand it, FETs are square-law devices that generate mostly low-order and second-order; /archives//html/Amps/2012-10/msg00006.html (13,412 bytes)
84. Re: [Amps] The transformer rosetta stone (Gary Smith) (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 04 Nov 2012 15:17:04 +0000; Gary, While I don't know any of the specific transformers you mention, I will try to clear up your questions in a general way. I always thought the KVA came from V x I Yes, that's correct. The proble; /archives//html/Amps/2012-11/msg00048.html (13,360 bytes)
85. Re: [Amps] low Q output matching (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 11 Nov 2012 17:59:26 +0000; Carel, Hi, I was wondering what else, besides bad harmonic suppression, will happen when I design my (single band) output matching network (PI-L) with low Q (lowest Q needed to get the match done) ?; /archives//html/Amps/2012-11/msg00086.html (7,907 bytes)
86. Re: [Amps] low Q output matching (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 12 Nov 2012 18:20:33 +0000; Carel, I don't mind even 0 dB of harmonic suppression.... because that is easily solved afterwards with fixed valued C's/L's lowpass filter. If you have no harmonic suppression in the matching circui; /archives//html/Amps/2012-11/msg00089.html (11,669 bytes)
87. Re: [Amps] Microwave Oven Power Transformer (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 19 Nov 2012 18:13:49 +0000; I can very well understand the temptation to use MOTs, since they are so widely available for free, and let's face it, most of us are cheapskates! But please do understand what MOTs are: They are the; /archives//html/Amps/2012-11/msg00136.html (10,639 bytes)
88. Re: [Amps] Microwave Oven Power Transformer (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 28 Nov 2012 19:07:01 +0000; Hi Steve, Carl, and all, Normally, 10 or 15% reduction in volts is enough to bring the magnetising current down, Not really, with MOTs. It would still have an excessive magnetizing current! I just to; /archives//html/Amps/2012-11/msg00188.html (11,832 bytes)
89. Re: [Amps] Most power ever run on amateur radio :-) (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 20 Dec 2012 00:55:39 +0000; About two years ago I was contacted by an Italian ham, who wanted my advice about how to wind a three phase high voltage power transformer for his amp. He reported that he was running 45kW, and that; /archives//html/Amps/2012-12/msg00124.html (10,401 bytes)
90. Re: [Amps] MOVs (Vic K2VCO) (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 09 Jan 2013 18:57:39 +0000; Vic, I have a power supply that needs to work here in the US and in Israel, where power is supplied as one phase of 240V plus a safety ground. I am not sure if one of the 240V lines is grounded as we; /archives//html/Amps/2013-01/msg00064.html (9,733 bytes)
91. Re: [Amps] Peter Dahl transformers (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 16 Feb 2013 00:59:39 +0000; Hello, may I weigh in on this matter? Intelligent design is to remote a heavy duty transformer option as was done by Amp Supply. The built in transformer was fine for the casual op. I would say that; /archives//html/Amps/2013-02/msg00125.html (9,800 bytes)
92. Re: [Amps] Peter Dahl transformers (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 19 Feb 2013 21:57:05 +0000; Adrian, You may like RF Splatter from switching power supplies but I sure do not! No, my taste isn't that crazy. I also prefer as low a noise level as I can get. That's largely why I moved away from; /archives//html/Amps/2013-02/msg00148.html (13,524 bytes)
93. Re: [Amps] Peter Dahl transformers (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 21 Feb 2013 13:58:33 +0000; Peter, The downside to the switcher must be reliability. There are far more parts, so the MTBF must be less. Yes, this part is true, specially when comparing a switcher to a simple, non-regulated tra; /archives//html/Amps/2013-02/msg00167.html (12,007 bytes)
94. Re: [Amps] Peter Dahl transformers (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 22 Feb 2013 20:10:59 +0000; Bill, Manfred, in spite of the problems for the homebrewer, I'm still interested in switching power supplies for high power amps. It's true that doing the whole development work to build just one uni; /archives//html/Amps/2013-02/msg00194.html (14,740 bytes)
95. Re: [Amps] Peter Dahl transformers (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 23 Feb 2013 15:03:10 +0000; Mike, Why would you want to build a 50V 50A 2500W supply (other than for the challenge) when you can buy a HP supply on Ebay for $30-40... Very true. The main reason would probably the challenge, and; /archives//html/Amps/2013-02/msg00207.html (10,949 bytes)
96. Re: [Amps] Heatsinks for SSPAs - Newbie Questions and UK source (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 01 Mar 2013 17:49:20 +0000; Conrad, Just a quick answer, as I'm about to leave for a month-long trip and won't read the forum in that time: The max dissipation of the device is 500W so I suppose that means that I have to get ri; /archives//html/Amps/2013-03/msg00015.html (10,341 bytes)
97. Re: [Amps] Advice needed for SS amp (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 06 Jun 2013 18:02:55 +0000; Bill, it's great joy to see how much discussion your post has stirred up. I'm thinking of water cooling. It's probably the only way to go. I suggest that you spend some time learning how to calculate; /archives//html/Amps/2013-06/msg00127.html (16,998 bytes)
98. Re: [Amps] Advice needed for SS amp (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 07 Jun 2013 02:08:14 +0000; Larry, Jim, Any one want to check my math? I checked it, and Larry is right. A half gallon of water (1893 milliliters), which has a specific heat of roughly 4.19 joule per milliliter per kelvin (the; /archives//html/Amps/2013-06/msg00140.html (9,693 bytes)
99. Re: [Amps] Advice needed for SS amp (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 07 Jun 2013 15:49:24 +0000; Alan, I am at exactly the newbie stage Manfred advocates: building a 50W amplifier using a pair of one dollar switching FETs, in my case IRF640, and a cheap 48V laptop PSU. I have a prototype more or; /archives//html/Amps/2013-06/msg00159.html (14,501 bytes)
100. Re: [Amps] The Pin One Problem (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 08 Jun 2013 21:03:46 +0000; Hello everybody! An interesting thread, once more! I will contribute two examples of this problem, and how it has affected me. My main HF transceiver for the last 22 years has been a Kenwood TS-450.; /archives//html/Amps/2013-06/msg00190.html (17,645 bytes)

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