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81. [AMPS] make it bigger!! (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Wed, 09 Dec 1998 20:52:58 -0800; I have found that a little piece of .020 or .032 teflon sheet will prevent arcing to gnd in close spaced parts. Have seen perforated metal with circular or triangular holes in the metal racks at hard; /archives//html/Amps/1998-12/msg00180.html (8,404 bytes)
82. [AMPS] Restoring (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Mon, 14 Dec 1998 08:04:59 -0800; If the problem is tarnish on the silver plating of the parts, put them in a dish or pan lined with aluminum foil. Pour boiling water over them and add a tablespoon of baking soda. In a few minutes th; /archives//html/Amps/1998-12/msg00226.html (7,904 bytes)
83. [AMPS] "Technical Material" Amplifier (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 24 Dec 1998 07:45:05 -0800; I have 4 ea 8295A and 2 ea 5CX1500A with 2 ea SK840 breach lock sockets and SK806 chimneys for them. All came from TI employee surplus store in Dallas. Will sell for best offers received in next week; /archives//html/Amps/1998-12/msg00373.html (9,542 bytes)
84. [AMPS] Good Multimeters/not amp related (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Mon, 16 Nov 1998 07:19:31 -0800; Don't think you can go wrong with a Fluke DVM. Have owned a model 77 for 15 years and no problems. Strongly recommend the "sleep" feature. If you leave it on, and not making measurements, it goes int; /archives//html/Amps/1998-11/msg00224.html (8,236 bytes)
85. [AMPS] Hybrid Combiner Questions (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Tue, 06 Oct 1998 20:05:59 -0700; I believe that Communication Concepts, Inc has kits and parts for building power combiners. They have ad in QST. I believe that the Motorola R.F. Transistor manual has design info in it's ap notes. M; /archives//html/Amps/1998-10/msg00049.html (7,568 bytes)
86. Re: [Amps] Alpha 76CA (score: 1): Author: "Dan" <dhearn@ix.netcom.com>; Date: Thu, 30 Oct 2003 07:11:18 -0800; Don you did not say what type of antenna/xmsn line you are using. It sounds like it might be a coax fed dipole. A perfectly matched coax fed dipole will not guarantee an RF cold outer shield. RF goin; /archives//html/Amps/2003-10/msg00301.html (8,121 bytes)
87. Re: [Amps] searching for original 4cx1000 qst project info (score: 1): Author: "Dan" <dhearn@ix.netcom.com>; Date: Tue, 11 Nov 2003 08:03:48 -0800; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2003-11/msg00141.html (9,811 bytes)
88. Re: [Amps] TL-922A 10 Meter Mods (score: 1): Author: "Dan" <dhearn@ix.netcom.com>; Date: Tue, 9 Dec 2003 07:34:45 -0800; I believe this info is on Rich Measures web site, at least it was when I asked the same question. 73, Dan, N5AR -- Original Message -- From: "Bob Jones" <rfjones@ris.net> To: <amps@contesting.com> Se; /archives//html/Amps/2003-12/msg00143.html (42,426 bytes)
89. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1): Author: "Dan" <dhearn@ix.netcom.com>; Date: Sun, 28 Dec 2003 13:33:54 -0800; There was an article in QST about 8-10 years ago describing a regulated HV PS. It used a large triac in the primary with feedback from an error amp in the secondary. I believe the author was AA5C in; /archives//html/Amps/2003-12/msg00434.html (8,792 bytes)
90. Re: [Amps] tube cooling (score: 1): Author: "Dan" <dhearn@ix.netcom.com>; Date: Sun, 15 Feb 2004 07:47:19 -0800; There is a basic problem with using a blower which "sucks" the air from the amplifier. At best, it can create a perfect vacuum which means that atmospheric pressure pushes air through the amp with a; /archives//html/Amps/2004-02/msg00121.html (11,819 bytes)
91. Re: [Amps] Alpha 76A Multimeter (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Tue, 3 Aug 2004 20:35:46 -0700; Don: I once designed some instruments to measure Radon gas in well water. The instruments had an annoying habit of showing "sticky meter syndrone". We concluded the problem was electrostatic charge o; /archives//html/Amps/2004-08/msg00029.html (9,356 bytes)
92. RE: [Amps] Applying HV to PA anodes (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Fri, 17 Sep 2004 15:06:42 -0700; Isn't it the case that the 77 has cutoff bias from the EBS when not driven? 73, Dan, N5AR Not necessary, nor is it with 8877's. All Alpha 77 series amps apply HV as soon as you switch primary power.; /archives//html/Amps/2004-09/msg00313.html (8,257 bytes)
93. [TowerTalk] (no subject) (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Thu, 14 Oct 2004 17:15:41 -0700; There is more to the BPL vote by FCC today. As I interpret it, they changed a rule that forced companies who install fiber optic to allow their competetors to have access to it. They ruled that this; /archives//html/Amps/2004-10/msg00210.html (7,864 bytes)
94. [TowerTalk] correction (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Thu, 14 Oct 2004 17:28:46 -0700; Sorry that copy and paste did not work for the url. Try this method go to http://bigcharts.marketwatch.com/ and look at the bottom of the page for a link to the story. 73, Dan, N5AR _________________; /archives//html/Amps/2004-10/msg00211.html (6,956 bytes)
95. [Amps] Interference Problem (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Fri, 15 Oct 2004 16:07:26 -0700; I live about 30 miles from a company which supplies high speed I net service by RF link. The terrain is such that some height is required for the antenna used with the system. They typically use eith; /archives//html/Amps/2004-10/msg00220.html (7,588 bytes)
96. RE: [Amps] Tuning (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Wed, 22 Dec 2004 07:38:16 -0800; Darryl, it depends, primarily, on the Q of the output tuned circuit, the degree of loading, and the bandwidth of the antenna/ transmission line system. Shortened antennas with loading coils have very; /archives//html/Amps/2004-12/msg00259.html (7,607 bytes)
97. RE: [Amps] Relays (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Thu, 23 Dec 2004 07:44:17 -0800; AC relays have a different magnetic core structure than DC so your idea will not work. You could rectify the 120 to DC then use a resistor in series with the coil to give 24DC at the coil. It would o; /archives//html/Amps/2004-12/msg00286.html (8,560 bytes)
98. RE: [Amps] Need Info (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Sat, 22 Jan 2005 14:56:58 -0800; Dave: I owned a 2000L for several years which I modified with excellent results. I sold it about 6 years ago when I moved from Dallas to Washington state. I have no schematics or notes on the changes; /archives//html/Amps/2005-01/msg00466.html (9,798 bytes)
99. RE: [Amps] Variac Question (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Sun, 30 Jan 2005 10:55:04 -0800; Mike, I did that for several years and no problems. It gives you the ability to vary primary xfmr voltage between 120 and 240 vac. GL, Dan, N5AR Can I use a General Radio Variac 0-135Volts 20 Amp on; /archives//html/Amps/2005-01/msg00615.html (7,608 bytes)
100. Re: [Amps] 90V Var Reg. (score: 1): Author: "daniel hearn" <dhearn@ix.netcom.com>; Date: Mon, 7 Mar 2005 18:46:37 -0800; How about a wall light dimmer triac into a rectifier? I have used one to manually bring up the filament on a home built linear. 73, Dan, N5AR Hopefilly, somebody here, I'm pretty sure, may have alrea; /archives//html/Amps/2005-03/msg00205.html (7,907 bytes)

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