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141. [AMPS] Have Cake & Eat it too (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 10 Sep 1999 08:43:32 -0700; <snipped> Yes, the 40m dipole is buggered. Maybe the coax is open or shorted at the top. The SWR's are almost always higher with the amp on -- that suggests to me that the amp is generating lots of h; /archives//html/Amps/1999-09/msg00074.html (9,043 bytes)
142. [AMPS] Re: swr (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 28 Sep 1999 14:41:49 -0700; I think the correct way to put this is that the impedance seen looking into the line will vary with the length. However, the theoretical swr will be constant, regardless of the point at which it is m; /archives//html/Amps/1999-09/msg00299.html (8,560 bytes)
143. [AMPS] Amplifier for cw only-question. (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 28 Sep 1999 14:54:57 -0700; I recently considered the same issue and settled on AB2 (and I don't even know where my microphone is). I designed my amplifier for 1500 watts out, and efficiency is irrelevant -- I don't hold the ke; /archives//html/Amps/1999-09/msg00300.html (8,631 bytes)
144. [AMPS] L-Pi net...downside? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 01 Aug 1999 09:45:51 -0700; OK, another question. I'm designing the output network for my amp, and I'm facing the issue of getting a reasonable Q on 10 meters with practical parts. The 1999 ARRL handbook has a discussion of thi; /archives//html/Amps/1999-08/msg00001.html (8,532 bytes)
145. [AMPS] Clipperton L Plate Choke (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 06 Aug 1999 10:19:23 -0700; Jeff, I know Tom knows this, but don't forget to SHORT the choke with the shortest possible strap before checking with a GDO. 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/ampsfaq; /archives//html/Amps/1999-08/msg00136.html (7,648 bytes)
146. [AMPS] Doorknob Capacitor Questions (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 08 Aug 1999 12:19:11 -0700; I couldn't find any around here. However, the local hobby shop ordered some copper sheets, and some copper foil (two thicknesses) which were very useful from a company called K&S. More expensive, but; /archives//html/Amps/1999-08/msg00162.html (7,627 bytes)
147. [AMPS] Arco trimmers (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 09 Aug 1999 15:03:59 -0700; Does anybody know where I can buy a small quantity of high-capacitance trimmers for my pi-input circuit, like the ARCO trimmers I see used in so many amp projects? Mouser and Digikey don't seem to ha; /archives//html/Amps/1999-08/msg00176.html (7,141 bytes)
148. [AMPS] Arco trimmers (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 10 Aug 1999 06:50:25 -0700; Thanks to everyone who made suggestions regarding where to find the Arco trimmers for my input circuit. I ordered them from Dan's Small Parts <http://www.fix.net/dans.html>. He had the best price and; /archives//html/Amps/1999-08/msg00184.html (7,347 bytes)
149. SV: [AMPS] Arco trimmers (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 10 Aug 1999 12:49:20 -0700; Hans, I'm sure it would work fine, but switched pi-nets seem much more practical for an 8 or 9-band amplifier. 73, Vic, K2VCO Fresno CA -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissio; /archives//html/Amps/1999-08/msg00186.html (8,659 bytes)
150. [AMPS] What's wrong? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 15 Aug 1999 13:20:04 -0700; OK, I am confused. I'm sitting down to design the pi-net input circuit for my 2 x 3-500z amp. I started by looking at the circuit for a similar amplifier in the 1994 ARRL handbook. They use iron powd; /archives//html/Amps/1999-08/msg00267.html (7,261 bytes)
151. [AMPS] Re: What's wrong? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 16 Aug 1999 16:38:20 -0700; In case anyone cares, the bug is in the brain. The inductance is not directly proportional to the number of turns, it's proportional to the square root of the number of turns. 21 turns is exactly 2.2; /archives//html/Amps/1999-08/msg00276.html (7,382 bytes)
152. [AMPS] PS diode equalizing (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 03 Jul 1999 08:43:42 -0700; What's the current view on equalizing caps and resistors across diodes in rectifier strings? The ARRL handbook says you should put a 0.01 mf capacitor and (I think) 1000 ohms per volt resistor across; /archives//html/Amps/1999-07/msg00019.html (7,942 bytes)
153. [AMPS] PS diode equalizing (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 05 Jul 1999 07:33:06 -0700; 30-odd years ago, I worked at a BC station. We had a 5kw FM transmitter whose power supply contained boards made of many, many 400 piv diodes. They were paralled with (I think 470K) resistors. We los; /archives//html/Amps/1999-07/msg00056.html (9,265 bytes)
154. [AMPS] Power Output (was 4cx10000) (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 09 Jul 1999 10:54:53 -0700; I'm a CW DXer and I agree 100%. Every fraction of a db adds up, especially when it comes from the antenna, but also when it's transmit-only. My new amp will run 1500 watts out, compared to 700-800 fr; /archives//html/Amps/1999-07/msg00159.html (9,260 bytes)
155. [AMPS] Vacuum capacitor (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 12 Jul 1999 15:22:52 -0700; I am looking at possibly acquiring a Jennings UCS-300 capacitor from a friend. However, he says that it is missing the drive mechanism -- apparently, the part that changes rotary motion to in-out mov; /archives//html/Amps/1999-07/msg00226.html (6,704 bytes)
156. [AMPS] Wanted: vacuum variable (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 20 Jul 1999 18:43:08 -0700; I'm looking for a vacuum variable, around 400-500 pf at 5kv. I'd prefer a physically smaller one like a USLS-465. It must be checked out with a hipot. I also will need a counter dial to go with it. 7; /archives//html/Amps/1999-07/msg00386.html (6,636 bytes)
157. [AMPS] Fusing PS (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Fri, 23 Jul 1999 13:43:31 -0700; OK, I'm practically finished with the power supply section of my 1500 watt amp. The plate transformer is rated at 2400 vac at 1a CCS, and there is an additional 140 watts of filament power, 120 watts; /archives//html/Amps/1999-07/msg00427.html (7,181 bytes)
158. [AMPS] Good Meter vs CRT was Hot wire.... (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Wed, 28 Jul 1999 13:19:37 -0700; Mike, They have to go into the shack, where they measure the PEP output with their meter. They don't care if you have a 3cx100000x driven by a pair of 833's in push-pull or a 6146. They make field st; /archives//html/Amps/1999-07/msg00581.html (10,515 bytes)
159. [AMPS] HV connector (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Wed, 28 Jul 1999 13:25:56 -0700; I recall a thread about this in the past, but I can't seem to find it. Does anyone know where to get a Millen HV connector (the cable part and the chassis part), or have a suggestion for an obtainabl; /archives//html/Amps/1999-07/msg00582.html (6,895 bytes)
160. [AMPS] explain this one (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 31 Jul 1999 09:12:13 -0700; This is apparently a common problem on SB1000/AL80 type amplifiers. My SB1000 bandswitch was damaged in this way. What happens is that the stationary contact of the bandswitch (which happens to be cl; /archives//html/Amps/1999-07/msg00660.html (8,851 bytes)

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