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161. Re: [Amps] Electrical Distribution Methods (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 15 Oct 2013 18:45:10 +0000; Don, Lots of pictures, and full description of the system, done while I was building it, are here: http://ludens.cl/paradise/turbine/turbine.html Manfred == Visit my hobby homepage! http://ludens.cl; /archives//html/Amps/2013-10/msg00282.html (8,254 bytes)
162. Re: [Amps] 200-ohm tank and "un-un" in HF amp design? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 20 Oct 2013 17:44:32 +0000; Jim, Assuming adequate core/wire sizing and airflow, can anyone think of a solid reason *not* to design a legal-limit HF amp output tank for 200 ohms, then use a 4:1 "un-un" transformer to step it do; /archives//html/Amps/2013-10/msg00358.html (9,434 bytes)
163. Re: [Amps] 200-ohm tank and "un-un" in HF amp design? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 21 Oct 2013 13:36:18 +0000; Hello, it should be remembered that the values of loading capacitance, tuning capacitance and the inductance of the tank coil not only depend on impedances and frequency, but also on Q. The designer; /archives//html/Amps/2013-10/msg00377.html (12,974 bytes)
164. Re: [Amps] Measuring IMD (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 02 Nov 2013 19:17:54 +0000; Hello all, my approach to IMD measuring is this: We need basically two things: A dual tone drive source, and some sort of spectrum analyzer. I will comment them separately. The old style of dual tone; /archives//html/Amps/2013-11/msg00019.html (12,848 bytes)
165. Re: [Amps] Measuring IMD (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 03 Nov 2013 17:43:30 +0000; I don't think that this system using two diode detectors into a scope would be a good replacement for actual IMD measurement. My reasons: Even if both diode detectors have the same response curve, th; /archives//html/Amps/2013-11/msg00035.html (8,635 bytes)
166. Re: [Amps] Remote monitoring of SSPA (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 13 Nov 2013 15:06:33 +0000; Conrad, I have been asked to look into the possibility of remote monitoring an SSPA at a distance of a little over 50m. My feelings are that ethernet is the way to go. That would be overkill, but may; /archives//html/Amps/2013-11/msg00278.html (9,535 bytes)
167. Re: [Amps] PARALLEL CAPS IN OUTPUT (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 06 Dec 2013 17:23:54 +0000; Hi all, If one is to believe Philip H. Smith in 'Electronic Applications of the Smith Chart', McGraw-Hill 1969, page 6, Fig 1.3, the maximum voltage appearing on a lossless transmission line with an; /archives//html/Amps/2013-12/msg00051.html (12,825 bytes)
168. Re: [Amps] E-core transformer (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 06 Dec 2013 17:52:53 +0000; Larry, unable to follow Peter's suggestion, due to a pronounced and pretty long standing lack of virgins available for sacrifice to the gods of recycled electromagnetics, I still resort to plain old; /archives//html/Amps/2013-12/msg00052.html (9,593 bytes)
169. Re: [Amps] SSPA & Heatsink Compounds (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 11 Dec 2013 19:32:20 +0000; Paul, I'm getting around to my 2 meter kilowatt SSPA. My question is which of the multitude of heatsink compounds do you recommend? I have read some of the comparisons mostly dealing with CPU cooling; /archives//html/Amps/2013-12/msg00082.html (9,495 bytes)
170. Re: [Amps] SSPA & Heatsink Compounds (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 12 Dec 2013 14:43:10 +0000; Don, and all, while it's very true that a THIN layer of thermal compound is desirable, it's ESSENTIAL for the layer to be continuous, that is, to avoid having air pockets there. And the techniques to; /archives//html/Amps/2013-12/msg00097.html (10,233 bytes)
171. Re: [Amps] SSPA & Heatsink Compounds (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 16 Dec 2013 20:24:14 +0000; Steve, and all, One word of caution with Manfred's technique - be very careful if applying clamping pressure onto a transistor with a ceramic cap. Yes, that's right! I had plastic parts in mind, like; /archives//html/Amps/2013-12/msg00123.html (9,883 bytes)
172. Re: [Amps] Fake and Counterfeit Chinese Transistors 2SC3133 (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 31 Dec 2013 17:39:56 +0000; Jim, I just got scammed on some fake and counterfeit 2SC3133 transistors on EBay. They have the emitter and collector pins REVERSED! Blew up some additional stuff in the Icom 751A that I'm repairing.; /archives//html/Amps/2013-12/msg00239.html (9,427 bytes)
173. Re: [Amps] Solid state amp (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 01 Jan 2014 14:33:57 +0000; Hi Tom, replying to your message from last year: I am working on a solid state amp project. After a few false starts, and damaged parts, I am trying a new approach and not pushing the parts anywhere; /archives//html/Amps/2014-01/msg00000.html (11,374 bytes)
174. Re: [Amps] Freescale (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 04 Jan 2014 00:26:42 +0000; Alek, With valves, you can have them rebuilt. Ain't seen anybody that can get the smoke back into transistors. Then we definitely have to meet some day! When I was young, had better eyes, and was as; /archives//html/Amps/2014-01/msg00023.html (8,299 bytes)
175. Re: [Amps] Another eBay Goodie (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 24 Jan 2014 19:48:10 +0000; Hi, I could waste all day complaining about illegal CB Amps to e-Pay. The proliferation of them is amazing. But, if I complain frequently, their mechanical response would probably be to ban all Amps.; /archives//html/Amps/2014-01/msg00244.html (9,947 bytes)
176. Re: [Amps] MOVs (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 26 Jan 2014 20:48:23 +0000; John, you beat me to post that comment: Professionally, I use more Transorbs (from companies like OnSemi and Microsemi). They are superior to back to back zeners for transient spike clamping. I also; /archives//html/Amps/2014-01/msg00250.html (8,137 bytes)
177. Re: [Amps] Non-linear linear (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 31 Jan 2014 18:57:58 +0000; Paul, your problem sounds, looks, smells, tastes and feels like a self-oscillation happening only when the bandswitch is in the 15/17m positions. So I guess it actually IS a self-oscillation! ;-) Sha; /archives//html/Amps/2014-01/msg00349.html (9,302 bytes)
178. Re: [Amps] Solid state relays..again (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 12 Feb 2014 17:56:05 +0000; Hello, Once in a while that thing turns on with a WHummpppp and a low frequency ringing that just trails off. Let's see if I can explain this in a way everyone can understand. When a power transforme; /archives//html/Amps/2014-02/msg00102.html (15,396 bytes)
179. Re: [Amps] Solid state relays..again (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 14 Feb 2014 01:08:09 +0000; Brian, The little black varistor thingies work quite nicely for eliminating that "THUMMMPP!" in small to medium-size equipment. I don't think they would, really. They don't have enough resistance to; /archives//html/Amps/2014-02/msg00115.html (10,749 bytes)
180. Re: [Amps] Working on my Darwin award (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 24 Feb 2014 19:49:51 +0000; Well, folks, you all know that to win a Darwin Award you have to kill yourself in a sufficiently stupid way, BEFORE leaving any descendants that perpetuate your faulty genes. So, you all know what yo; /archives//html/Amps/2014-02/msg00248.html (9,648 bytes)

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