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181. Re: [Amps] AM Downward Modulation (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 14 Apr 2006 12:10:33 -0400; When tuning up the amp for AM service you should tune it up just as you would for SSB. As Joe says, using a keyer or just tuning for maximum output with full drive. Then reduce the carrier level for; /archives//html/Amps/2006-04/msg00249.html (9,554 bytes)
182. Re: [Amps] working backwards to setup tank (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 18 Apr 2006 20:54:20 -0400; If you want to test it at lower power, figure what plate voltage and plate current will give the same load impedance as the high power load you are designing for. Example: 3000 volts at 1 amp (using; /archives//html/Amps/2006-04/msg00294.html (10,664 bytes)
183. Re: [Amps] working backwards to setup tank (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 19 Apr 2006 10:43:21 -0400; I have found that the mfj works best while using the lowest frequency that will give you a reading. Most capacitors are measured / speced at 1000 Hz. Going higher in frequency you start to measure st; /archives//html/Amps/2006-04/msg00299.html (14,158 bytes)
184. Re: [Amps] Cal Lab (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 23 Apr 2006 19:17:10 -0400; If you use the tv be sure to check with the station to see if they actually use a rubidium or other good standard. I don't know about these days but in the past not all stations used good standards.; /archives//html/Amps/2006-04/msg00337.html (11,020 bytes)
185. [Amps] Astron RS20A primary resistance (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 7 May 2006 22:59:19 -0400; I need to know what the primary resistance is of the Astron RS20A transformer. I would like to know the resistance of a 220 volt transformer and a 120 volt transformer. Maybe someone has a 220 volt R; /archives//html/Amps/2006-05/msg00037.html (6,884 bytes)
186. Re: [Amps] Astron RS20A primary resistance (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 8 May 2006 10:23:43 -0400; The low voltage is right out of the transformer secondary. It is about 1/2 of what it should be. I used to be an astron distributor. I sold about a dozen of these supplies to a customer and he sent t; /archives//html/Amps/2006-05/msg00039.html (10,027 bytes)
187. Re: [Amps] Astron RS20A primary resistance (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 8 May 2006 16:24:44 -0400; Thanks Dan, I have a VS35M also and it shows a resistance of around an ohm on my Fluke 77 meter so that sounds in the ball park. I wasn't sure if the transformer in the 20 amp supply would be a lot h; /archives//html/Amps/2006-05/msg00044.html (11,296 bytes)
188. [Amps] How intermod limits your PEP (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 16 May 2006 00:38:49 -0400; HOW INTERMOD LIMITS YOUR PEP. Some interesting notes on PEP and intermod. With 1000 watts PEP output and 3rd order IM products down -30 db from PEP (-24 db from from one tone of a two tone test ) the; /archives//html/Amps/2006-05/msg00107.html (9,556 bytes)
189. Re: [Amps] PDF file VTVM diodes (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 16 May 2006 18:21:17 -0400; Speaking of Pdf files, what do you guys use to create a Pdf file? Thanks Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m; /archives//html/Amps/2006-05/msg00153.html (9,771 bytes)
190. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 16 May 2006 21:42:47 -0400; Hi David, Yes I am in error, thank you, but only on the examples where the PEP is greater than 1000 watts (1123 watt example) I believe. The signal should be 223 (not 233 as you noted). My attempt i; /archives//html/Amps/2006-05/msg00168.html (13,354 bytes)
191. Re: [Amps] How intermod limits your PEP (score: 1): Author: garyschafer@comcast.net; Date: Thu, 18 May 2006 00:46:23 +0000; Hi David, Thanks again for your comments. To accurately portray what I am saying I believe it would take a more complex math solution than what I am using. Maybe you or someone else can come up with; /archives//html/Amps/2006-05/msg00216.html (13,519 bytes)
192. Re: [Amps] How intermod limits your PEP (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 21 May 2006 21:45:36 -0400; -- Hi David, I see the problem. Your maths are calculating the 30 db down (or 20 db down in your first example) from one of the two tones power (A) rather than from PEP even though you say you are u; /archives//html/Amps/2006-05/msg00272.html (11,772 bytes)
193. Re: [Amps] Wattmeters (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 23 May 2006 17:17:24 -0400; Use a scope. The best pep wattmeter you can get. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-05/msg00297.html (9,402 bytes)
194. Re: [Amps] Alpha 91b fan/blower motor (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 23 May 2006 22:41:26 -0400; You want to read the difference in water level between the high and low side to obtain inches of pressure. Not the difference from no pressure to pressure. Speed will have the greatest effect on pres; /archives//html/Amps/2006-05/msg00305.html (13,910 bytes)
195. Re: [Amps] Alpha 91b fan/blower motor (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Tue, 23 May 2006 23:25:15 -0400; Will, To read pressure you measure the difference between the water levels in each part of the tube when the blower is on. The part of the tube that is connected to the amp will get pushed down and t; /archives//html/Amps/2006-05/msg00308.html (19,067 bytes)
196. Re: [Amps] RE : who needs it? Henry 8K (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 24 May 2006 10:32:12 -0400; And no athlete has ever used steroids to enhance their game. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/l; /archives//html/Amps/2006-05/msg00321.html (8,460 bytes)
197. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 26 May 2006 10:50:23 -0400; Here is something that is sometimes forgotten when in the quest for an amp with "lots of head room". If the amp is to be tuned and operated at its full power capability everything works fine. If you; /archives//html/Amps/2006-05/msg00379.html (8,881 bytes)
198. Re: [Amps] multi-tube amplifiers (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 26 May 2006 15:42:50 -0400; That is the one Colin! That was my first hand book and I still have it. The binding fell apart and my dad later glued it with some cloth to keep it somewhat together. I still have it. The 4X250 amp; /archives//html/Amps/2006-05/msg00394.html (9,434 bytes)
199. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 26 May 2006 16:00:33 -0400; This is exactly what I am talking about. At what power level do you tune the amp up at? If you tune it up at 1500 watts output and you get 55.5% efficiency then you do not have any headroom above 15; /archives//html/Amps/2006-05/msg00396.html (10,975 bytes)
200. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sat, 3 Jun 2006 22:33:27 -0500; We certainly seem to have a moderator (whoever he is) who has difficulty in recognizing the difference between personal attacks, snide remarks and outright humor. Please - give us all a break here. I; /archives//html/Amps/2006-06/msg00080.html (12,503 bytes)

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