Mail Archive Search: <+from:ka4inm@tampabay.rr.com>

Results:

References: [ +from:ka4inm@tampabay.rr.com: 211 ]

Total 211 documents matching your query.

121. Re: [Amps] filament transformer (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Fri, 24 Sep 2010 09:32:30 -0400; Did you take into account the choke's induction at 60 Hz? I think the drop from the same amount of wire not wound into a coil would be interesting. -- Ron KA4INM - I'm proud to be Chuck's pop! ______; /archives//html/Amps/2010-09/msg00305.html (7,574 bytes)
122. Re: [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Wed, 06 Oct 2010 08:54:51 -0400; /*snip*/ Small hole hardware cloth and bolts with fender washers on the inside. -- Ron KA4INM - _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont; /archives//html/Amps/2010-10/msg00046.html (8,190 bytes)
123. Re: [Amps] Switching Supplies for High Current Filaments (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Wed, 06 Oct 2010 09:16:10 -0400; And the switching supply is regulated and adjustable to provide the desired Voltage at the tube pins. A 50 or 60 Amp supply would be needed for a 30 Amp load, they are cheep as pulls from junked equi; /archives//html/Amps/2010-10/msg00050.html (8,510 bytes)
124. Re: [Amps] Shielding Effectiveness (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Wed, 06 Oct 2010 13:06:22 -0400; The tubes are behind "expanded metal," which might be better than hardware cloth, but the holes are larger than 3/16" hardware cloth. -- Ron KA4INM - Next AReU meeting is on October 5, 2010 @ 7:30 pm; /archives//html/Amps/2010-10/msg00059.html (7,467 bytes)
125. Re: [Amps] New 2 PA design (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Fri, 15 Oct 2010 13:45:09 -0400; Most commercial designs use two FETs in push pull and then combine the pairs, this has several advantages, the balanced collector/drain current cancels preventing saturating the output ferrites and t; /archives//html/Amps/2010-10/msg00238.html (8,255 bytes)
126. Re: [Amps] FW: IRF parts (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 23 Oct 2010 22:07:21 +0000; I do also, for those having problems with this plan, put the list server's address in your address book with a two letter alias, I use "am" for the amps list, then you can send your reply to the prev; /archives//html/Amps/2010-10/msg00358.html (8,200 bytes)
127. Re: [Amps] Cathode input circuit (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Tue, 02 Nov 2010 01:11:34 +0000; Think of it as a plate tank (parallel resonant circuit) for a RF amplifier 100 Watt stage with the plate tank coil wound with very small copper tubing with a (or two) wires threaded through it. The r; /archives//html/Amps/2010-11/msg00010.html (8,237 bytes)
128. Re: [Amps] time to death... (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Fri, 12 Nov 2010 23:40:01 +0000; I don't like planes, still I have had friends that were flight instructors so I have heard a lot, but aren't labels like a simple dymo or an etched plate allowed in situations like this? That is what; /archives//html/Amps/2010-11/msg00174.html (9,198 bytes)
129. Re: [Amps] QRO is alive and well..in Greece (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Mon, 15 Nov 2010 09:28:57 -0500; Greek Band Plan HF Band USE 135.7-137.8 LF (1) 2200 m Temporary (2) 1810-1850 HF 160 m Primary 3500-3800 HF 80 Primary 7000-7100 HF 40 Primary 7100-7200 (3) HF 40 Primary 10100-10150 HF 30 Secondary; /archives//html/Amps/2010-11/msg00243.html (8,442 bytes)
130. Re: [Amps] Toshiba tube 7f41R (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Mon, 15 Nov 2010 14:32:22 -0500; Remember CTL + F will search a web page with most browsers. -- Ron KA4INM - I'm proud to be Chuck's pop! _______________________________________________ Amps mailing list Amps@contesting.com http://l; /archives//html/Amps/2010-11/msg00254.html (7,764 bytes)
131. Re: [Amps] W3NQN bandpass filters, question. (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sun, 28 Nov 2010 14:56:10 +0000; If the coils aren't melted the only damage that I would expect is the high Voltage damaging some of the capacitors so I would replace all of them and test the results, then I would test (capacity and; /archives//html/Amps/2010-11/msg00528.html (8,062 bytes)
132. Re: [Amps] Black heat shields (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sun, 19 Dec 2010 13:04:54 +0000; If it's not real it is made of paper and will burn. Painting an aluminum shield would not work nearly as well a anodizing it black. That is how equipment manufactures get black aluminum heat sinks. -; /archives//html/Amps/2010-12/msg00241.html (8,017 bytes)
133. Re: [Amps] Black heat shields (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sun, 19 Dec 2010 20:47:47 +0000; /*snip*/ It is standard and normal to paint satellite dish faces FLAT WHITE to scatter the IR from the sun. -- Ron KA4INM - I'm proud to be Chuck's pop! ______________________________________________; /archives//html/Amps/2010-12/msg00254.html (8,444 bytes)
134. [Amps] Black heat shields (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Mon, 20 Dec 2010 03:01:11 +0000; /*snip*/ It is standard and normal to paint satellite dish faces with FLAT WHITE NON conductive NON metallic paint to scatter the IR from the sun. -- Ron KA4INM - I'm proud to be Chuck's pop! _______; /archives//html/Amps/2010-12/msg00269.html (8,508 bytes)
135. Re: [Amps] wires through center of coax (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Tue, 21 Dec 2010 05:47:47 +0000; < Answer, you put a shorted stub on each end of the part of the transmission line where you don't want the line exposed to the elements (frequently the short in an elbow using 6" or larger line, thin; /archives//html/Amps/2010-12/msg00297.html (9,929 bytes)
136. Re: [Amps] TenTec Centurion - 422 tuning question (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Thu, 23 Dec 2010 15:28:25 +0000; I would add a 200 mFd at 600 Volts across the loading capacitor and see if: 1. it cures the problem on 40, 80 and 160. 2. you can still properly adjust loading control in your highest channel. If so; /archives//html/Amps/2010-12/msg00313.html (8,300 bytes)
137. Re: [Amps] Cracked Chimney (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sun, 26 Dec 2010 02:18:44 +0000; Several commercial cavities that I worked on had a very thin "fiber glass + epoxy" cylinder that dropped down around the fins, it was a sheet that was glued into a cylinder with a white cement I was; /archives//html/Amps/2010-12/msg00363.html (9,767 bytes)
138. Re: [Amps] 1nF 3kV feedthrough (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 01 Jan 2011 16:39:55 +0000; You can always make your own. Drill a hole in a sheet of metal (or use an exiting hole) wrap a typical wire with hV insulation fiberglass, or silicone tape, polyurethane or glass tubing and measure t; /archives//html/Amps/2011-01/msg00002.html (7,710 bytes)
139. Re: [Amps] 1nF 3kV feedthrough (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 01 Jan 2011 16:58:28 +0000; Indeed, I was thinking 1 nF is smaller than 1 pF which is not correct. 0.000001uF (MFD) = 0.001nF = 1pF (MMFD) -- Ron KA4INM - I'm proud to be Chuck's pop! ___________________________________________; /archives//html/Amps/2011-01/msg00005.html (7,404 bytes)
140. Re: [Amps] Adhesives (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sat, 08 Jan 2011 16:57:17 +0000; I would attempt to carefully remove the label completely, clean the back of the label and where it goes, I would scrub the parking spot with a "scotch bright" (pot scrubber, mask around it with paint; /archives//html/Amps/2011-01/msg00089.html (8,828 bytes)

Current List: 121 - 140
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]