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161. Re: [Amps] Fan for SB220 (score: 1): Author: donroden@hiwaay.net; Date: Fri, 17 Dec 2010 18:11:02 -0600; If I ever go into it again, I may add a two layer heat shield to double the surface area the fan can cool. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2010-12/msg00195.html (9,075 bytes)
162. Re: [Amps] Fw: Fan for SB220 (score: 1): Author: donroden@hiwaay.net; Date: Sun, 19 Dec 2010 01:14:40 -0600; And remember, small CPU fans weren't available to use as "booster" fans on the filament pins. Now,with a little fabrication, each tube can have it's own filament pin cooler. Don W4DNR _______________; /archives//html/Amps/2010-12/msg00233.html (7,922 bytes)
163. Re: [Amps] Fan for SB220 (score: 1): Author: donroden@hiwaay.net; Date: Sun, 19 Dec 2010 01:34:48 -0600; On the contrary..... the black shield absorbs radiation from the tubes. The air flow across the black shield removes the heat. The more square inches of absorption material, the better. The Heath fan; /archives//html/Amps/2010-12/msg00235.html (9,617 bytes)
164. Re: [Amps] Fan for SB220 (score: 1): Author: donroden@hiwaay.net; Date: Sun, 19 Dec 2010 01:45:41 -0600; The Britts were very particular about their afternoon tea. A highly polished ( on the outside ) tea pot retained the internal water/tea heat longer than a tea pot that was dull or painted black. Don; /archives//html/Amps/2010-12/msg00236.html (9,819 bytes)
165. Re: [Amps] Black heat shields (score: 1): Author: donroden@hiwaay.net; Date: Sun, 19 Dec 2010 10:04:07 -0600; http://www.engineeringtoolbox.com/emissivity-coefficients-d_447.html Anybody ever see a polished solar hot water collector ? Ever wondered why not ? Don W4DNR _______________________________________; /archives//html/Amps/2010-12/msg00245.html (7,910 bytes)
166. Re: [Amps] Fuses (score: 1): Author: donroden@hiwaay.net; Date: Sat, 08 Jan 2011 08:00:38 -0600; All the commercial AMs and FMs used silicone-dampened AC overloads. All the AC current ran through a five or six turn high current relay that was ( at rated current ) almost ready to pull the normal; /archives//html/Amps/2011-01/msg00084.html (9,053 bytes)
167. Re: [Amps] Where is power measured ? (score: 1): Author: donroden@hiwaay.net; Date: Wed, 06 Apr 2011 08:28:32 -0500; And don't forget the advantage of transmitting a "linear" ( read "clean" ) signal out of that tube with handles versus standing a pair of 3-500s on their tip-toes to make a watt meter read 1500. Don; /archives//html/Amps/2011-04/msg00227.html (7,898 bytes)
168. Re: [Amps] Where is power measured ? (score: 1): Author: donroden@hiwaay.net; Date: Wed, 06 Apr 2011 08:56:37 -0500; And I see more of the former than the later. a 4CX35,000 is on borrowed time after 18 months. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://li; /archives//html/Amps/2011-04/msg00232.html (7,821 bytes)
169. [Amps] 240VAC service and Redheads (score: 1): Author: donroden@hiwaay.net; Date: Thu, 07 Apr 2011 02:23:53 -0500; I married a redhead from one of the Campbell Clans of Sottland... And I am still being taxed without representation............ Don W4DNR _______________________________________________ Amps mailing; /archives//html/Amps/2011-04/msg00274.html (8,722 bytes)
170. Re: [Amps] Where is power measured ? (score: 1): Author: donroden@hiwaay.net; Date: Thu, 07 Apr 2011 07:08:20 -0500; I measure my directionals every month and my non-directionals at LEAST four times a year. You need to know where you are before you can know where you are going. Yes, the FCC has relaxed the rules fr; /archives//html/Amps/2011-04/msg00278.html (8,694 bytes)
171. Re: [Amps] Where is power measured ? (score: 1): Author: donroden@hiwaay.net; Date: Thu, 07 Apr 2011 12:30:28 -0500; I'm guessing receiver overload instead of harmonics. Don W4DNR Quoting TexasRF@aol.com: _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c; /archives//html/Amps/2011-04/msg00289.html (10,237 bytes)
172. Re: [Amps] WARNING! W4RT (score: 1): Author: donroden@hiwaay.net; Date: Thu, 14 Apr 2011 11:10:14 -0500; And I appreciate the "Heads-Up". Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-04/msg00420.html (8,875 bytes)
173. [Amps] DIN vs N (score: 1): Author: donroden@hiwaay.net; Date: Sat, 23 Apr 2011 21:43:16 -0500; DIN connectors vs Type N ....... Is there a larger cable that mates with the DIN connector ? What's the advantage / disadvantages of the DIN ? Don W4DNR ______________________________________________; /archives//html/Amps/2011-04/msg00495.html (6,753 bytes)
174. Re: [Amps] DIN vs N (score: 1): Author: donroden@hiwaay.net; Date: Mon, 25 Apr 2011 17:35:58 -0500; I think the plain ole PL259 due to more contact area will handle more AMPS than a type N at 6M and below. But again, is there a larger cable than 213 for rotor duty ? Don W4DNR ______________________; /archives//html/Amps/2011-04/msg00525.html (8,940 bytes)
175. Re: [Amps] Power handling of an SMA (score: 1): Author: donroden@hiwaay.net; Date: Wed, 27 Apr 2011 12:26:20 -0500; I drill out the holes to a larger size. I also pre-tin the braid and then I cut the braid with a razor knife. Don W4DNR _______________________________________________ Amps mailing list Amps@contesti; /archives//html/Amps/2011-04/msg00562.html (8,073 bytes)
176. Re: [Amps] testing a big amp (score: 1): Author: donroden@hiwaay.net; Date: Fri, 13 May 2011 23:39:27 -0500; One Hundred and Ten Amps ?? Not very efficient @ 180KW load. Two point eight megawatts in / 180 KW out Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com; /archives//html/Amps/2011-05/msg00092.html (7,879 bytes)
177. Re: [Amps] Meter issue (score: 1): Author: donroden@hiwaay.net; Date: Fri, 27 May 2011 21:46:42 -0500; The meter should be isolated from the diodes by a couple of 100 ohm resistors to each terminal. A little more meter protection. Don W4DNR _______________________________________________ Amps mailing; /archives//html/Amps/2011-05/msg00262.html (8,950 bytes)
178. Re: [Amps] 4/1000A Ques. (score: 1): Author: donroden@hiwaay.net; Date: Sat, 25 Jun 2011 02:39:15 -0500; +500, -200, 20 watts Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-06/msg00290.html (6,960 bytes)
179. Re: [Amps] PA choke design (score: 1): Author: donroden@hiwaay.net; Date: Wed, 29 Jun 2011 10:01:54 -0500; On monobanders, a quarter wave length of coax would seem to offer the ideal choke. I've seen that at VHF , but a 90 footer might be a little extreme... LOL Don W4DNR _________________________________; /archives//html/Amps/2011-06/msg00314.html (7,375 bytes)
180. Re: [Amps] PA choke design (score: 1): Author: donroden@hiwaay.net; Date: Wed, 29 Jun 2011 11:35:47 -0500; Come on Carl.... you know you would love to see a roll of RG-8 between the Amp and power supply......... :-) Don W4DNR _______________________________________________ Amps mailing list Amps@contestin; /archives//html/Amps/2011-06/msg00317.html (9,054 bytes)

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