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181. Re: [Amps] Working on my Darwin award (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 26 Feb 2014 20:01:08 +0000; On a different note, I worked with Mass Spectrometers for a while. I don't know the rating of those BIG electromagnets, but if it tried to take a wrench away, you just let have it. It'd crush your ha; /archives//html/Amps/2014-02/msg00261.html (10,777 bytes)
182. Re: [Amps] transformer winding (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 17 Mar 2014 20:41:46 +0000; Hi Paul, I need to have a secondary of between 900 to 1050 to produce between 1200 to 1400 VDC anywhere between 0.25 to 0.4 amps should be sufficient for the 3cx100A5 it will be powering. That should; /archives//html/Amps/2014-03/msg00084.html (14,212 bytes)
183. Re: [Amps] QEX May/June 2014 amplifier article (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 17 May 2014 19:12:42 +0000; Alan, May I timidly ask if anyone here can fathom the purpose of the article on page 14 of the current ARRL QEX magazine? Unfortunately I cannot, because for well over a year the magazines from ARRL; /archives//html/Amps/2014-05/msg00102.html (9,893 bytes)
184. Re: [Amps] Soft start (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 01 Jun 2014 22:02:47 +0000; Jim, Ken, Support the Chinese or support the US. I just had a look at both sales. It's interesting to note that the US seller charges more money for the bare board, than the Chinese seller does for t; /archives//html/Amps/2014-06/msg00001.html (8,317 bytes)
185. Re: [Amps] RG6 Power Handling (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 19 Jun 2014 16:22:29 +0000; Hi all, what 50 coax cable would be recommended for the internal wiring of a compact 160-10m legal limit amplifier? I'm looking for a cable thinner than RG-8, much more flexible, non-foam (to avoid d; /archives//html/Amps/2014-06/msg00054.html (8,054 bytes)
186. Re: [Amps] RG6 Power Handling (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 20 Jun 2014 18:49:15 +0000; Hi all, thanks for your suggestions! I checked the data of the cables suggested, and among them I like the RG-400 best. RG-142 would be usable too, but the added flexibility of RG-400 seems better su; /archives//html/Amps/2014-06/msg00064.html (8,526 bytes)
187. Re: [Amps] Buck-Boost Transformer Selection (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 25 Jun 2014 21:11:41 +0000; Dick, Max Volts 264 Max Amps 62.5 1.5KVA The current rating does not make sense. How can I sort this out ?? As Carl said: Move the decimal point in the current rating. It's very common to see Chinese; /archives//html/Amps/2014-06/msg00089.html (9,197 bytes)
188. Re: [Amps] Buck-Boost Transformer Selection (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 26 Jun 2014 16:43:44 +0000; Jim, Dick, For example, let's say your actual line voltage is 250V and the amplifier draws 14 Amps, which correspnds to a power rating for the amplifier of 3.5KVA. (That, by the way, is the peak powe; /archives//html/Amps/2014-06/msg00103.html (11,055 bytes)
189. Re: [Amps] 50V FET output transformer (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 23 Jul 2014 17:42:51 +0000; Dan, Has anyone built an output transformer for a 50V LDMOS FET (Freescale device) that could lend some help with this? I have some experience with such transformers. Not specifically with the Freesc; /archives//html/Amps/2014-07/msg00100.html (8,198 bytes)
190. Re: [Amps] SB-200 input. (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 25 Jul 2014 16:53:42 +0000; Hi all, adding to Carl's comment: Tuned inputs provide the flywheel effect that makes the tubes easier to drive and improves IMD 5-10dB. That's indeed to biggest reason to use a tuned input. The impe; /archives//html/Amps/2014-07/msg00112.html (13,328 bytes)
191. Re: [Amps] Experience with Heart Pacemakers? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 03 Aug 2014 17:33:11 +0000; Hi all, I think it should be pointed out that even if you use perfectly shielded coax cable, perfect connectors perfectly assembled, and a perfect ground connection to all your equipment, you can sti; /archives//html/Amps/2014-08/msg00019.html (15,687 bytes)
192. Re: [Amps] HV Diodes (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 11 Oct 2014 16:35:39 +0000; Dear all, I wonder why the diode selection is so totally overblown here. Let's assume a pretty big amplifer, solid legal limit, CCS, which is more than any ham needs. The power supply might deliver 3; /archives//html/Amps/2014-10/msg00049.html (12,494 bytes)
193. Re: [Amps] HV Diodes (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 14 Oct 2014 19:18:24 +0000; Carl, Are you suggesting that the 1N4007 is obsolete? I just checked, and it's still in full production by several companies, such as Diodes Inc, Fairchild, ON Semiconductors, Vishay, and a few more.; /archives//html/Amps/2014-10/msg00058.html (36,201 bytes)
194. Re: [Amps] HV Diodes (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 15 Oct 2014 02:05:26 +0000; Hardy, I believe the 1N4007 is actually manufactured as a PIN diode vs the PN configuration of the others in the same family. Yes, the 1N4007 is a PIN diode, as far as I can tell. What I'm not sure i; /archives//html/Amps/2014-10/msg00062.html (9,094 bytes)
195. Re: [Amps] HV Diodes (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 16 Oct 2014 19:47:58 +0000; Carl, Do the Alpha 8410, 9500, 8406, and the 89 belong into the real world of tube type ham amps? I would say, they do. And they don't use the 1N5408 but instead use a potted bridge rectifier, rated; /archives//html/Amps/2014-10/msg00082.html (10,237 bytes)
196. Re: [Amps] HV Diodes (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 16 Oct 2014 20:55:21 +0000; Steve, The Alpha bridge modules discussed below are these: http://www.deantechnology.com/pdf/pdf24.pdf Yes. It's P/N 2HVFWB5KB and uses glass passivated rectifier cells which are not 1N4007s, but rat; /archives//html/Amps/2014-10/msg00087.html (10,828 bytes)
197. Re: [Amps] HV Diodes (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 16 Oct 2014 21:43:47 +0000; Carl, If you knew as much about amp history as you may not know about other ham items you would know that Alpha has used potted diode blocks since the 1970's. Indeed I'm not a specialist in historica; /archives//html/Amps/2014-10/msg00094.html (10,136 bytes)
198. Re: [Amps] HV Diodes (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 16 Oct 2014 22:28:57 +0000; Paul, Regarding Alpha, the 77Sx (dual 8877) uses a quad set of Semtech SCH5000 modules rated at only 5KV/0.5A. The current rating is increased to 1A with forced-air cooling. I?m sure these have faile; /archives//html/Amps/2014-10/msg00095.html (11,927 bytes)
199. [Amps] Solid State Amps (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 17 Oct 2014 18:24:13 +0000; Dear all, Dan touched the subject of solid state amps, and Louis was quick to state that most hams would prefer a good tube amp. If you ask me, the performance/cost ratio will dictate what hams final; /archives//html/Amps/2014-10/msg00125.html (15,127 bytes)
200. Re: [Amps] Solid State Amps (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 18 Oct 2014 15:49:47 +0000; Lee, For that exact reason I hesitate to design amplifiers around specific transistors for which there are no equivalents, like the ARF1500 or the IXZ210N50L. If the company making them decides to st; /archives//html/Amps/2014-10/msg00164.html (22,661 bytes)

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