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Total 562 documents matching your query.

41. Re: [Amps] Ducting Suggestion (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 21 Mar 2012 13:27:56 -0400
I don't know about more aesthetically pleasing, but to me the dryer hose is far too fragile. I'd pick the hose like we use with drops for the big all shop dust collectors. Of course the fan used for
/archives//html/Amps/2012-03/msg00217.html (8,129 bytes)

42. Re: [Amps] Ducting Suggestion (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 21 Mar 2012 18:12:37 -0400
Mine has a 2" hose on it and is so darn loud I have to wear hearing protection when running it. My dust collector has a 5" hose. Those come in either a 10 or 12' length. I've forgotten which. The one
/archives//html/Amps/2012-03/msg00223.html (9,862 bytes)

43. Re: [Amps] question for you experts... (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 27 Mar 2012 22:50:39 -0400
It's more than just the antenna connector. Add feed line and antenna. The practice of the choke goes way back to when the legal limit was considerably less than today and it applies to transmitters a
/archives//html/Amps/2012-03/msg00288.html (15,801 bytes)

44. Re: [Amps] How to know when filter caps begin to fail (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 29 Mar 2012 12:05:57 -0400
Wayyyy back I had a Dentron DTR2000 about a month old. One of the filter caps blew the can right off it. AT least it was a relatively small cap that was only about an inch tall and maybe 3/4" in diam
/archives//html/Amps/2012-03/msg00350.html (17,507 bytes)

45. Re: [Amps] amp cooling / triodes vs tetrodes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 02 Apr 2012 18:35:22 -0400
I don't know what is or is not proprietary, but you can build anything you want including copying a commercial design as long as it's for your own amp. Proprietary doesn't mean anything when it comes
/archives//html/Amps/2012-04/msg00012.html (8,707 bytes)

46. Re: [Amps] FWD: Ham Radio Amp - $8500 (Louisville Ky) 3CX10000-a7 (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 05 Apr 2012 21:31:12 -0400
Let's see...12 KW dissipation. GG takes a peak of 1540 watts of drive, but that gives you 24KW out and it'll do this up through 2 meters and past 24000/.6=40KW peak in, or 40000/240 or only 166A My e
/archives//html/Amps/2012-04/msg00068.html (9,538 bytes)

47. Re: [Amps] Longshot - looking for 8873 (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 06 Apr 2012 18:21:23 -0400
It can be done, but I don't know what the success ratio would be and the 8874's are already very expensive. The 3CX800 has a larger anode inside the radiator, I don't know if it'd clear of not. The m
/archives//html/Amps/2012-04/msg00079.html (10,208 bytes)

48. Re: [Amps] Filter Capacitors (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 12 Apr 2012 23:07:26 -0400
Doesn't the transformer have to make up the "difference" when the cycle is drawing from the cap and finish recharging the cap during the rest of the cycle? It's the total charging current that over w
/archives//html/Amps/2012-04/msg00117.html (10,321 bytes)

49. Re: [Amps] Filter Capacitors (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 13 Apr 2012 00:27:11 -0400
Yup! each half cycle in full wave? 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-04/msg00121.html (7,805 bytes)

50. Re: [Amps] Slightly off topic (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 17 Apr 2012 22:28:26 -0400
I have 3 machines with them and will probably have a 4th soon. The 4th fails to boot on over 75% of cold boots and comes up with the error message to insert the system disk and run repair. If I just
/archives//html/Amps/2012-04/msg00173.html (9,531 bytes)

51. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 29 Apr 2012 20:24:31 -0400
Which is a plus for tubes. And the protection circuitry for a SS amp is extremely elaborate. Add to that the aging of the transistors. On an hour by hours basis, transistors "operated well within the
/archives//html/Amps/2012-04/msg00265.html (14,002 bytes)

52. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 29 Apr 2012 21:04:32 -0400
No, it's exactly what I expect out of a tube amp, and I have one that will do it. So it's a valid comparison if I want the same thing out of SS. I don't want a 1200 watt amp that has to be derated fo
/archives//html/Amps/2012-04/msg00268.html (11,379 bytes)

53. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 29 Apr 2012 23:37:52 -0400
But, I'd have to build a system to use them as components including band switching with LP filters. I was told for my own use, I could import, or build an amp and It does not have to be FCC approved.
/archives//html/Amps/2012-04/msg00276.html (11,884 bytes)

54. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 30 Apr 2012 00:20:30 -0400
It helps to have a computer systems design background<:-)) Although many systems are running right at edge of the device limits. Even with the best heat transfer using the latest heat transfer compou
/archives//html/Amps/2012-04/msg00277.html (12,694 bytes)

55. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 30 Apr 2012 02:29:37 -0400
Agreed, but even then it takes a very good as well as fast tuner at reduced power at least to begin. It's better to to have an auto tuner that can be set up using an antenna analyzer. It remembers th
/archives//html/Amps/2012-04/msg00282.html (10,991 bytes)

56. Re: [Amps] Tubes vs. Solid State (was) Expert Amps 2K-FA: Any Opinions ? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 01 May 2012 01:04:15 -0400
My desktops aren't really desktops. they are full size tower cases with multiple core CPUs running well above 3 GHz. These cases are big and heavy. Each one has 3 140mm fans in front cooling the HDs.
/archives//html/Amps/2012-04/msg00320.html (10,122 bytes)

57. Re: [Amps] Tubes vs. Solid State (was) Expert Amps2K-FA:AnyOpinions? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 01 May 2012 12:58:39 -0400
Unfortunately the "substrate" can exceed the temperature of the medium in which the device is submerged by quite a bit. "Substrate" normally refers to the Silicon (or other material) on which the dev
/archives//html/Amps/2012-05/msg00011.html (12,308 bytes)

58. Re: [Amps] Tubes vs. Solid State (was) Expert Amps2K-FA:AnyOpinions? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 01 May 2012 13:13:20 -0400
IF I remember my physics it takes 1 calorie to raise one CC of water, 1 degree while it takes 100 calories to change one 1 CC of water to vapor. The efficiency depends a lot of the interface area and
/archives//html/Amps/2012-05/msg00012.html (9,014 bytes)

59. Re: [Amps] New Heat Transport Links, Interesting (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 01 May 2012 17:15:39 -0400
Welll...yah, sorta, maybe...<:-)) In its present state it would be extremely expensive to implement production wise. The increase in efficiency or reduction in thermal resistance would depend on the
/archives//html/Amps/2012-05/msg00031.html (9,603 bytes)

60. Re: [Amps] Tubes vs. Solid State (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 01 May 2012 22:07:08 -0400
Florida? How about Michigan in the summer? Just the two big computers in my den with 750 watt power supplies struggling to keep up, will about drive you out from Mid April through September, or even
/archives//html/Amps/2012-05/msg00044.html (9,319 bytes)


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