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Total 133 documents matching your query.

61. Re: [Amps] Solid State Amps (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Fri, 17 Oct 2014 14:54:30 -0400
Manfred, Love the thinking-outside-the-box! Has someone patented this who might block production? Any concerns about potential RFI from a switching-amp in a rf-amp circuit? Has anyone tried this befo
/archives//html/Amps/2014-10/msg00128.html (15,503 bytes)

62. Re: [Amps] Solid State Amps (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Fri, 17 Oct 2014 18:04:26 -0400
Carl, Are these something like the Latin "Caveat emptor"? I recall tuning a sweep tube amp at a club station - it could get exciting trying to get it done within the allowable seconds before the tube
/archives//html/Amps/2014-10/msg00137.html (9,330 bytes)

63. Re: [Amps] solid state amps (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Fri, 17 Oct 2014 18:08:15 -0400
Dick, At the current levels of an equivalent 12vdc amp the DC power connections can double as a welder! 50vdc does seem a little more manageable - do those connection points have a welding-effect if
/archives//html/Amps/2014-10/msg00138.html (8,583 bytes)

64. [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Sat, 27 Dec 2014 13:34:58 -0500
What is the probable output of an amp using a pair of Eimac 4 x 150 a / 7034 tubes on 6M? -- *David* ~KD4E~ Nevils, Georgia USA Safe & Secure Search Engine: duckduckgo.com Android for Hams: groups.ya
/archives//html/Amps/2014-12/msg00107.html (7,374 bytes)

65. Re: [Amps] The genius of ham radio (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Mon, 12 Jan 2015 14:27:07 -0500
Doesn't "theory" say that a bumblebee cannot fly? -- *David* ~KD4E~ Nevils, Georgia USA Safe & Secure Search Engine: duckduckgo.com Android for Hams: groups.yahoo.com/group/hamdroid Creative Tech: gr
/archives//html/Amps/2015-01/msg00052.html (10,021 bytes)

66. Re: [Amps] The genius of ham radio (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Mon, 12 Jan 2015 15:08:19 -0500
I should have typed "Didn't we once believe that a bumblebee should not be able to fly?" http://www.straightdope.com/columns/read/1076/is-it-aerodynamically-impossible-for-bumblebees-to-fly "... a fa
/archives//html/Amps/2015-01/msg00056.html (12,270 bytes)

67. Re: [Amps] The genius of ham radio (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Mon, 12 Jan 2015 18:17:08 -0500
How hard would it be for a group of Hams to create an alternative "Handbook"? An ebook could be cheap or free - print-on-demand for those who really want it - an expensive but available option. Most
/archives//html/Amps/2015-01/msg00057.html (9,727 bytes)

68. Re: [Amps] The genius of ham radio (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Mon, 12 Jan 2015 20:47:03 -0500
As seen in academia, business, and politics an absence of challenging alternatives/competition can lead to arrogance and/or an absence of accountability. I'd like to see an effort to assemble a peer-
/archives//html/Amps/2015-01/msg00060.html (10,137 bytes)

69. Re: [Amps] The genius of ham radio (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Tue, 13 Jan 2015 10:33:12 -0500
To clarify the terms of discussion are these definitions correct? Conjecture: A proposed explanation which lacks a clear means of testing and is one among several. Hypothesis: A proposed explanation
/archives//html/Amps/2015-01/msg00087.html (11,021 bytes)

70. Re: [Amps] The genius of ham radio (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Tue, 13 Jan 2015 10:37:44 -0500
Is there a filter-like impact of a tuned or tank circuit in an rf application which also muddies the water a little? -- *David* ~KD4E~ Nevils, Georgia USA Safe & Secure Search Engine: duckduckgo.com
/archives//html/Amps/2015-01/msg00088.html (8,578 bytes)

71. Re: [Amps] k9yc pdf (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Tue, 13 Jan 2015 18:49:26 -0500
Dean is an awesome guy! He once tried to explain the math behind his analysis app ... it was way over my head! When I situated my tower base wrongly, so that the legs weren't aligned with the guy anc
/archives//html/Amps/2015-01/msg00101.html (9,262 bytes)

72. [Amps] Multi-tube vs Single or Dual-tube amps? (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Mon, 19 Jan 2015 16:27:52 -0500
common with sweep tubes, I think some with 4x150's, and 6146's. Other than the added sockets and wiring complexity are there additional down-sides to such a design? e.g. Eight 6146's should generate
/archives//html/Amps/2015-01/msg00147.html (7,856 bytes)

73. Re: [Amps] Multi-tube vs Single or Dual-tube amps? (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Mon, 19 Jan 2015 19:06:43 -0500
OK, I've received the education I anticipated, thanks! Price comparison for a true 600w output 160-10m linear amp: 813 $90. new, $45 - $50. each used, tested good. x 2 = $90. - $180. tube cost. 6146
/archives//html/Amps/2015-01/msg00162.html (12,403 bytes)

74. [Amps] 5 Minutes for Ameritron 811H to warm up? (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Thu, 22 Jan 2015 22:06:05 -0500
Remember me asking about multi-tube amps? Well, a local Ham has a brother who likes to buy, try, & sell Ham gear and he just happened to have an Ameritron 811H in need of a new home. His asking price
/archives//html/Amps/2015-01/msg00203.html (8,180 bytes)

75. Re: [Amps] 5 Minutes for Ameritron 811H to warm up? (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Fri, 23 Jan 2015 18:47:50 -0500
The seller just wrote this: "I think the problem is in the meter circuit. Even when the meter shows just 800 volt the amp does 600 watts. We were checking it out today and I don't think it needs caps
/archives//html/Amps/2015-01/msg00221.html (9,301 bytes)

76. [Amps] What 811A's Should I Try to Find? (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Sat, 24 Jan 2015 23:28:19 -0500
I captured and saved VK1OD's abandoned page re. the 811H and associated tubes. I've also been reading threads here, and elsewhere. When I'm at Hamfests and have an opportunity to buy or trade for som
/archives//html/Amps/2015-01/msg00269.html (7,050 bytes)

77. Re: [Amps] What 811A's Should I Try to Find? (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Sun, 25 Jan 2015 12:27:43 -0500
Carl, Since everything I read says 100 -> 600 -> 1200 watts are the meaningful points where the receiving station notices a difference I can see no reason to push it beyond 600w. Thanks re. the recom
/archives//html/Amps/2015-01/msg00276.html (8,870 bytes)

78. [Amps] Useful Meter Movement Repair Resource (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Sun, 08 Feb 2015 18:42:27 -0500
Just spotted this on swap.qth.com ... y'all may already know this but just in case ... -- I recently had need to have an open circuit SB-220 plate meter repaired for a friend. I was talking to the Se
/archives//html/Amps/2015-02/msg00089.html (7,924 bytes)

79. Re: [Amps] VHF amps available (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Wed, 25 Feb 2015 17:43:26 -0500
George, According to http://www.rfparts.com/mrf175gv-ma.html those devices are good to 200w each at 225MHz = 800w. They look real accessible to modification for HF given the air wound coils ... perha
/archives//html/Amps/2015-02/msg00147.html (10,027 bytes)

80. [Amps] TRADE: For HF Amp (score: 1)
Author: "qrv@kd4e.com" <qrv@kd4e.com>
Date: Thu, 26 Feb 2015 21:00:28 -0500
I need a reliable 160-10m HF amplifier, solid state or tube. I have two 6KW APC 240vac Inverter/UPS units and one 4.8KW Isolation/Step-Down/Phase Transformer I bought for a now-abandoned project. I c
/archives//html/Amps/2015-02/msg00160.html (7,574 bytes)

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