Mail Archive Search: <+from:KD7QAE@ARRL.NET>

Results:

References: [ +from:KD7QAE@ARRL.NET: 117 ]

Total 117 documents matching your query.

81. [Amps] need a switch (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Fri, 13 Jan 2006 02:41:18 +0000; All, If anyone out there has an RF rated switch they want to part with, let me know. The switch needs to have 2 poles and at least 6 positions. I will be using one pole to directly switch the "L" sec; /archives//html/Amps/2006-01/msg00363.html (6,384 bytes)
82. Re: [Amps] FW: RFI Question (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Sat, 04 Feb 2006 18:20:07 +0000; The impedance of free space is 377 Ohms/square. Spacepaint is a radar absorbing technology that attempts to match this value over a range of RF frequencies of interest. If it worked, we would not hav; /archives//html/Amps/2006-02/msg00092.html (8,767 bytes)
83. Re: [Amps] FW: RFI Question (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Sat, 04 Feb 2006 18:32:24 +0000; Interesting. There is an optical technique called the "crab's eye lens" which uses a deep parabola with a detector (non imaging) at the top of the curve. It works by glancing reflections of the light; /archives//html/Amps/2006-02/msg00093.html (9,985 bytes)
84. Re: [Amps] Transformer construction information (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Wed, 08 Feb 2006 03:23:13 +0000; We all have our favorite books on XFMRs if we have a strong interest. Mine are: Ordean Kilty Transformer Design Handbook with Nomograms (best treatment of Ferro Resonant XFMRS ever) McLyman Transform; /archives//html/Amps/2006-02/msg00174.html (9,579 bytes)
85. Re: [Amps] transformer talk (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Fri, 10 Feb 2006 02:12:52 +0000; For the major types of filters the secondary RMS current is related to the DC load current as: Inductor input: 0.7 FWCT capacitor input: 1.0 to 1.2 FWB capacitor input: 1.6 to 1.8 Data from O.H. Schr; /archives//html/Amps/2006-02/msg00214.html (8,857 bytes)
86. Re: [Amps] transformer talk (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Fri, 10 Feb 2006 14:36:50 +0000; These are the ranges of the value Irms under most conditions of winding and capacitor and wiring leakage inductance and series resistance as developed by theory. For a design point I would suggest us; /archives//html/Amps/2006-02/msg00217.html (9,377 bytes)
87. Re: [Amps] Alpha 78 voltage sag (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Sun, 05 Mar 2006 14:56:02 +0000; Martin, If the XFMR is designed for 60Hz only, you will hae excessive core losses and high primary current as the core is being driven too close to saturation on each cycle. The primary current will; /archives//html/Amps/2006-03/msg00085.html (9,633 bytes)
88. Re: [Amps] Transformers in series (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Sun, 12 Mar 2006 21:32:52 +0000; There is NO requirement that cores be grounded to operate. You can tie the core to any potential you need to assure the insulation ratings are not exceeded. Electrostatic shields are another thing al; /archives//html/Amps/2006-03/msg00297.html (9,776 bytes)
89. Re: [Amps] Transformers in series (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Mon, 13 Mar 2006 01:10:30 +0000; True. There are safety concerns to be sure but no operational requirements. I would worry much about the primary to secondary and secondary to core insulation strength in this application and assure; /archives//html/Amps/2006-03/msg00310.html (9,526 bytes)
90. Re: [Amps] Microwave Oven Autopsy (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Thu, 16 Mar 2006 03:07:54 +0000; Actually, the microwave oven transformers are true engineering marvels in which the $2 technology was delivered for $1 safely and effectively. Most of these transformers are ferroresonant types which; /archives//html/Amps/2006-03/msg00417.html (25,975 bytes)
91. Re: [Amps] Trichloroethene (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Thu, 16 Mar 2006 06:28:09 +0000; I used "trichlor" as a degreaser for old equipment we were bringing back to useful service while an undergrad in the NMT physics department doing grunt work. I cannot donate blood as I indicate posit; /archives//html/Amps/2006-03/msg00429.html (8,456 bytes)
92. Re: [Amps] Microwave Oven Autopsy (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Fri, 17 Mar 2006 06:22:20 +0000; correct. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-03/msg00480.html (8,876 bytes)
93. [Amps] identification of surplus tank (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Sat, 25 Mar 2006 23:16:16 +0000; All, I picked up this lovely tank assembly and an extra coil identical to the one in the tank as well last week at the Puyallap ham swap meet near Seattle. The coil is wound on a large ceramic form a; /archives//html/Amps/2006-03/msg00669.html (6,899 bytes)
94. Re: [Amps] Need some 220K 2 watt carbon resistors (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Wed, 29 Mar 2006 06:41:25 +0100; Sure there is. Pick a frequency and tune out the inductance of the "resistor" with a capacitor. The combination is a single frequency pure resistance (SFPR). Had a buddie once who was making Moebius; /archives//html/Amps/2006-03/msg00725.html (12,149 bytes)
95. Re: [Amps] Strange Power Supply (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Fri, 21 Apr 2006 03:56:04 +0100; Good points Hal. I am a firm believer in closing the door on transients by having a series impedance, line to line HF capacitance, common mode impedance, line to neutral HF capacitance and finally li; /archives//html/Amps/2006-04/msg00320.html (10,636 bytes)
96. Re: [Amps] New Elecraft Amps (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Wed, 26 Apr 2006 03:04:10 +0100; All, A GS35b needs NO sockets! Also no fragile glass to break!, 1 Tube, microwave oven transformer, some caps and coils, a TR relay from Russia and a meter or two and you are on the air at full power; /archives//html/Amps/2006-04/msg00380.html (13,595 bytes)
97. Re: [Amps] New Elecraft Amps (GS35B sockets?) (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Thu, 27 Apr 2006 01:57:56 +0100; Sure, just a web search for gs35b and you will see everything from hose clamps to custom made supports. My favorite is Tony King's method of using 1/4" Cu stock to fabricate a mount that is both stur; /archives//html/Amps/2006-04/msg00393.html (20,936 bytes)
98. Re: [Amps] Plate Impedance, ARRL (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Thu, 27 Apr 2006 02:03:34 +0100; All, I now find teh web as my primary reference for ham radio and not the handbooks. I do have a copy of the handbook in the shop and at the operating position but have gotten far more benefit while; /archives//html/Amps/2006-04/msg00394.html (11,806 bytes)
99. Re: [Amps] Low ESR caps for amp power supplies (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Sun, 30 Apr 2006 19:15:27 +0100; John, I don't believe the issue was with the HV Al EL caps used in our application but rather in the low ESR, LV parts used on the output of motherboard voltage regulators. That said, it is good to b; /archives//html/Amps/2006-04/msg00440.html (9,070 bytes)
100. [Amps] another Cu foil source (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Tue, 13 Jun 2006 07:05:39 +0100; This place sells to the stained glass hobby: http://www.glassmart.com/regular_foil.asp 1.5mil (.0015") thick foil tapes and sheets are available. I bought some "slug barrier <http://www.greenfeet.com; /archives//html/Amps/2006-06/msg00271.html (6,804 bytes)

Current List: 81 - 100
Page: [1] [2] [3] [4] [5] [6]