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181. Re: [Amps] Threads - was idiocy - perhaps it still is (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Tue, 14 Mar 2006 09:39:02 -0800; Q: Why don't the British manufacture computers? A: They can't figure out how to make them leak oil. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ______________________________________________; /archives//html/Amps/2006-03/msg00371.html (7,592 bytes)
182. Re: [Amps] CHASSIS (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Thu, 16 Mar 2006 09:28:04 -0800; This is probably obvious to everyone, but just in case, keep in mind that all controls, switches, connectors, pilot lamps, etc. that are externally accessible on an amplifier or power supply built in; /archives//html/Amps/2006-03/msg00468.html (8,599 bytes)
183. Re: [Amps] Trichloroethene (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Fri, 17 Mar 2006 10:39:35 -0800; There's something called "Stoddard Solvent". It's the same as Varsol and is a mixture of petroleum products. I think it's quite similar to the "mineral spirits" used to thin paint. It's considered a; /archives//html/Amps/2006-03/msg00509.html (8,710 bytes)
184. Re: [Amps] series-connecting a split-stator variable cap (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Mon, 20 Mar 2006 07:56:38 -0800; One advantage of this is that there will be no current flow through the wipers connecting the rotor to the frame. I presume that, especially if it's an old capacitor and the wipers aren't in top cond; /archives//html/Amps/2006-03/msg00566.html (8,748 bytes)
185. Re: [Amps] Help Please: Power Amplifiers @ 100MHz (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Fri, 24 Mar 2006 11:10:48 -0800; The inductance and RF resistance of such capacitors is probably enormous at 100 MHz. You can't ignore the properties of real devices when simulating! -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2; /archives//html/Amps/2006-03/msg00645.html (6,983 bytes)
186. Re: [Amps] tube C + stray C (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Sat, 25 Mar 2006 14:59:55 -0800; Sure. The chassis has plenty of area, and the plate's not that far from it. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Amps mailing list Amps; /archives//html/Amps/2006-03/msg00668.html (7,189 bytes)
187. Re: [Amps] rf choke on output (score: 1): Author: Vic Rosenthal <vic@rakefet.com>; Date: Mon, 27 Mar 2006 08:48:42 -0800; A Z-50 is 7 uh. This would be suitable for a VHF amplifier, as it would have a reactance of about 80 ohms at 1.8 MHz. Many amplifiers have pie-wound 1 or 2 mh chokes in this position; however, since; /archives//html/Amps/2006-03/msg00690.html (7,138 bytes)
188. Re: [Amps] "I gotta tell this" (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 29 Mar 2006 12:55:21 -0800; If one of the features that you consider a must-have is the ability to change bands in less than a second, then the picture changes. An autotune tube amplifier is much more complicated and expensive; /archives//html/Amps/2006-03/msg00757.html (8,637 bytes)
189. Re: [Amps] SS vs. Tubes (was "I gotta tell this") (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Thu, 30 Mar 2006 08:48:40 -0800; Everything that you say is true, but given that one wants near-instant band-change, it's much less expensive to match your antennas to less than 2:1 and go solid state (no built-in tuner needed) than; /archives//html/Amps/2006-03/msg00781.html (8,632 bytes)
190. Re: [Amps] rolling your own (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Tue, 04 Apr 2006 10:17:31 -0700; I would use tubing, but anyway: Get a cylinder (piece of wood bannister material works well) of slightly less than the desired coil I.D. Drill a hole through one end. Stick one end of the wire partwa; /archives//html/Amps/2006-04/msg00050.html (8,040 bytes)
191. Re: [Amps] New Elecraft Amps (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Tue, 25 Apr 2006 15:50:14 -0700; I know how you feel, but when you figure out how to make a full QSK, automatic bandswitching and tuning amplifier for 160-6 meters out of surplus 813s -- even though it won't weigh 36 pounds -- let m; /archives//html/Amps/2006-04/msg00378.html (7,143 bytes)
192. Re: [Amps] Astron RS20A primary resistance (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Mon, 08 May 2006 08:11:18 -0700; I have a 240V Astron RS70 and the transformer has a center-tapped primary. The tap is used to operate the 120V fans! However, there is no way to rewire it for 120V; it's not got the usual dual windin; /archives//html/Amps/2006-05/msg00041.html (7,270 bytes)
193. Re: [Amps] Henry 8K (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Tue, 16 May 2006 12:09:36 -0700; There are a lot of things to consider. First of all, RFI to neighborhood electronic devices gets worse rapidly as you increase power. I found, for example, that I had to do a bunch of work on my alar; /archives//html/Amps/2006-05/msg00126.html (8,683 bytes)
194. Re: [Amps] PDF file VTVM diodes (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Tue, 16 May 2006 15:44:55 -0700; I use a free program called CutePDFWriter <http://www.cutepdf.com/Products/CutePDF/writer.asp> It installs like a Windows printer driver so anything you can print can be a PDF. -- 73, Vic, K2VCO Fres; /archives//html/Amps/2006-05/msg00156.html (8,178 bytes)
195. Re: [Amps] Henry 8K (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 17 May 2006 08:54:02 -0700; Who will work more DX on 160? The guy with 1500 watts, a 4-square and Beverages (and I don't mean 'adult beverages') or the guy with 10KW and a vertical monopole? I wish I had the antennas to make th; /archives//html/Amps/2006-05/msg00189.html (8,719 bytes)
196. Re: [Amps] adding second tube to AL1200 (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 17 May 2006 13:22:21 -0700; Off the top of my head, you would probably need an outboard power supply, since it's doubtful that a larger transformer would fit. Then you'd need to change the input network components for half the; /archives//html/Amps/2006-05/msg00202.html (7,891 bytes)
197. Re: [Amps] 813's (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Sat, 27 May 2006 12:45:55 -0700; There was an article in ARRL handbooks of the late '50s or early '60s describing a series of single-band amplifiers each using a pair of 813's. Construction was simple, with a pair of chassis behind; /archives//html/Amps/2006-05/msg00430.html (8,068 bytes)
198. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 31 May 2006 09:55:24 -0700; There's a technique described in my old ARRL Handbooks (1960's vintage) to test an amplifier for self-oscillation -- at LF, HF, and VHF. It describes the testing procedure, and discusses creating a s; /archives//html/Amps/2006-05/msg00564.html (8,824 bytes)
199. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 31 May 2006 17:12:18 -0700; 1958 Handbook, chapter 6 (HF Transmitters) p. 164: Subsection entitled "VHF Parasitic Oscillation" specifically addresses this. It's too much to type and I don't have a scanner, but it describes how; /archives//html/Amps/2006-05/msg00572.html (9,506 bytes)
200. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Wed, 31 May 2006 18:37:28 -0700; Summary: [think of a grid-driven amplifier with link-coupled input and output] Short the grid tank coil so that there's no possibility of tgtp oscillation at operating frequency. Replace fixed bias w; /archives//html/Amps/2006-05/msg00575.html (9,538 bytes)

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