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121. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 20 May 98 00:30:50 -0500; So Rich, are you saying that textbooks are incorrect? As I thought more about this, I realized that purely reactive networks do indeed make one load look like another. For example, we make a 3500 Oh; /archives//html/Amps/1998-05/msg00371.html (10,025 bytes)
122. [AMPS] Re: (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 19 May 98 22:45:23 -0800; I don't see any such manoeuvre in my text books. Transforming 100 j+0 ohms to 100k j+0 ohms by a single reactance is seemingly a bit of a stretch. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcn; /archives//html/Amps/1998-05/msg00372.html (9,695 bytes)
123. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 20 May 98 11:16:04 -0500; Do you grasp the concept of series to parallel conversions? If transforming 100 Ohms to 100K Ohms is a stretch, then how do you explain how a pi-net transforms a 3.5 KOhm output impedance of a tube; /archives//html/Amps/1998-05/msg00389.html (8,907 bytes)
124. [AMPS] Re: (score: 1): Author: gdaught6@leland.Stanford.EDU (George T. Daughters); Date: Wed, 20 May 1998 09:03:49 +0008; hi all, it looks like a snap to me! i've got no resistance ("0"), a pure reactance (+j100 ohms). i want to go straight out the +imaginary axis from 100 ohms to 100k ohms. so, i add an inductor in ser; /archives//html/Amps/1998-05/msg00390.html (8,973 bytes)
125. [AMPS] Re: (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 20 May 1998 17:13:11 +0100; Either you have failed to understand my postings over the weekend, or you are deliberately misrepresenting them... or maybe both. The transformation will not work for pure resistance, and it is not c; /archives//html/Amps/1998-05/msg00395.html (8,857 bytes)
126. [AMPS] Re: (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 20 May 98 16:47:08 -0800; The 100 ohm R is paralleled by 75nH? Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administ; /archives//html/Amps/1998-05/msg00400.html (8,780 bytes)
127. [AMPS] Re: (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 29 May 1998 12:29:57 +0100; I dont know for sure, but suspect the most likely candidates are magnetic resonance imaging (MRI), or to give its its old name, nuclear magnetic resonance (NMR) - the latter being dropped, as the wor; /archives//html/Amps/1998-05/msg00634.html (9,398 bytes)
128. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Fri, 29 May 98 08:55:49 -0500; Of course I could be wrong too. NMR I thought was used more for material research while MRI was more for diagnosis of human patients. Picker is another MRI manufacturer. The strength of the amp depe; /archives//html/Amps/1998-05/msg00637.html (9,367 bytes)
129. [AMPS] Re: (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Fri, 29 May 1998 18:05:55 +0100; Its probably better to say MRI is a subset of NMR. NMR does cover spectscopy (probably what you mean by material reseach), but the term 'NMR' has been droped in hospitals - as least amongst clinicia; /archives//html/Amps/1998-05/msg00647.html (9,403 bytes)
130. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Fri, 29 May 98 14:46:58 -0500; You know, just after I sent the message about 2T being the highest, I was looking through some old notes. GE has 3T & 4T systems. Oops. I goofed. OK, I've dug old my old Spectrian data sheets. Spect; /archives//html/Amps/1998-05/msg00655.html (8,327 bytes)
131. [AMPS] Re: (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Sun, 31 May 1998 15:14:52 -0600; Significant clinical-imaging MRI systems manufacturers that I can think of off-hand include Siemens (Munich), Philips (Eindhoven/Best), GE Medical Systems (New Berlin/Waukesha, WI), Picker (Highland; /archives//html/Amps/1998-05/msg00664.html (10,785 bytes)
132. [AMPS] Re: (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Sun, 31 May 1998 14:57:43 -0600; Hi Guys, In NMR/MRI, the rf frequency (frequency of nuclear magnetic resonance) depends on the element to be imaged and, additionally, is a linear function of the magnet strength as described by the; /archives//html/Amps/1998-05/msg00665.html (10,406 bytes)
133. [AMPS] Re: (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Fri, 17 Apr 1998 17:25:47 EDT; That is a very interesting question John and I would expect to see a wide variety of replies. I have never operated a QRO RF oscillator but have picked up many for parts or conversion. These go from; /archives//html/Amps/1998-04/msg00139.html (9,333 bytes)
134. [AMPS] Re: (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Fri, 17 Apr 1998 17:40:59; I can't count how many oscillators I've built that initially were doubleor triple- your money (two or three frequencies of oscillation). -- Scott Townley Gilbert, AZ nx7u@primenet.com -- FAQ on WWW:; /archives//html/Amps/1998-04/msg00149.html (8,809 bytes)
135. [AMPS] Re: (score: 1): Author: measures@vc.net (Rich Measures); Date: Fri, 24 Apr 98 19:38:33 -0800; - The critical thing is the inductance of the suppressor resistor (Rs). If Rs has nearly the same inductance as Ls, the stagger-tuning/broadbanding effect is lost. My guess is that 15nH is about top; /archives//html/Amps/1998-04/msg00268.html (7,943 bytes)
136. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 29 Apr 98 18:45:27 -0500; And they are good points indeed! Yes, yes, yes...Absolutely! Back in my days of designing 16 tone linear amps, guys would make that mistake all the time (including me). It's amazing what adding some; /archives//html/Amps/1998-04/msg00334.html (8,953 bytes)
137. [AMPS] Re: (score: 1): Author: nx7u@primenet.com (Scott Townley); Date: Wed, 29 Apr 1998 17:14:21; FWIW, I recall reading in several different models of HP spectrum analyzer literature (op manuals and a whole series of app notes) that the optimum input level for maximum IMD dynamic range (i.e., in; /archives//html/Amps/1998-04/msg00336.html (8,194 bytes)
138. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 29 Apr 98 19:22:49 -0500; That seems about correct although...It's gotta be pretty low. 73, Jon KE9NA -- Jon Ogden KE9NA http://www.qsl.net/ke9na "A life lived in fear is a life half lived." -- FAQ on WWW: http://www.contest; /archives//html/Amps/1998-04/msg00337.html (7,221 bytes)
139. [AMPS] Re: (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Wed, 04 Mar 1998 11:03:39 EST; I have known Tom Bruckner over 15 years and have always had pleasant dealings with him. He is sometimes very hard to track down as he travels a lot purchasing tubes, etc. The web page should help a l; /archives//html/Amps/1998-03/msg00041.html (8,595 bytes)
140. [AMPS] Re: (score: 1): Author: wrt@eskimo.com (Bill Turner, W7TI); Date: Wed, 11 Mar 1998 00:23:23 GMT; _______________________________________________________________ They're not legal in the US, at least when run at full power. Commander advertises them "for export only". I wonder where they ARE lega; /archives//html/Amps/1998-03/msg00159.html (7,887 bytes)

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