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Total 117 documents matching your query.

61. [Amps] Anode choke coil former material (score: 1)
Author: Tomm Aldridge <KD7QAE@ARRL.NET>
Date: Mon, 14 Mar 2005 04:14:25 +0000
In looking at Anode chokes for my dual GS35b amp, I see that most commercial units are wound on either PTFE (Teflon(tm)) or ceramic. My question is this; has anyone successfully used phenolic tubing,
/archives//html/Amps/2005-03/msg00315.html (6,957 bytes)

62. Re: [Amps] nylons (score: 1)
Author: Tomm Aldridge <KD7QAE@ARRL.NET>
Date: Wed, 16 Mar 2005 04:08:13 +0000
John, In my opinion, the use of Nylon for general standoffs in an RF amplifier is perfectly fine if a bit of thought is given as to the temperatuer they will be exposed to. I would not consider Nylon
/archives//html/Amps/2005-03/msg00357.html (9,839 bytes)

63. Re: [Amps] re. nylons (score: 1)
Author: Tomm Aldridge <KD7QAE@ARRL.NET>
Date: Thu, 17 Mar 2005 06:22:28 +0000
No, it is a ceramic product. We have it over here in the states too. MACOR&reg; Machinable Glass Ceramic * Is MACHINABLE with ordinary metal working tools * Allows FAST TURNAROUND. No post firing req
/archives//html/Amps/2005-03/msg00388.html (9,665 bytes)

64. [Amps] Potential Parsitic Suppressor coil? (score: 1)
Author: Tomm Aldridge <KD7QAE@ARRL.NET>
Date: Mon, 21 Mar 2005 02:46:23 +0000
All, As part of my amp project I just received some Dale 1 Ohm, 25W ww resistors. I was holding one in my hand admiring its chunkiness (yes, I am that strange)when I saw it was wound with 5T of flat
/archives//html/Amps/2005-03/msg00442.html (6,505 bytes)

65. Re: [Amps] Measuring RF Power (score: 1)
Author: Tomm Aldridge <KD7QAE@ARRL.NET>
Date: Sat, 26 Mar 2005 02:59:22 +0000
All, Some basic electronics follows. RMS Voltage or Current can be used to calculate power flow from a linear element, such as a resistor or any other impedance not related to the value of the voltag
/archives//html/Amps/2005-03/msg00566.html (11,049 bytes)

66. Re: [Amps] MLA-2500B Question (score: 1)
Author: Tomm Aldridge <KD7QAE@ARRL.NET>
Date: Mon, 28 Mar 2005 19:51:16 +0000
This is an interesting thread to me not because of the AL-811 vs MLA-2500 but because I am designing and building an amp. If I understand this correctly, using a TS570 transceiver to drive my amp imp
/archives//html/Amps/2005-03/msg00633.html (15,695 bytes)

67. Re: [Amps] Solid State HF High power linear amps (score: 1)
Author: Tomm Aldridge <KD7QAE@ARRL.NET>
Date: Tue, 29 Mar 2005 16:33:07 +0000
I like the 336V EV bus myself! Worked on one for Onan a decade ago that went into a HEV that Ford was making. My part was the 20kW 3 ph rectifier / boost converter regulator for the 336V bus. Would m
/archives//html/Amps/2005-03/msg00685.html (11,038 bytes)

68. Re: [Amps] pi network stray dogs (score: 1)
Author: Tomm Aldridge <KD7QAE@ARRL.NET>
Date: Thu, 07 Apr 2005 01:17:52 +0000
SOLENOID3.EXE (search on Google) gives total interwinding (parallel) capacitance of a single layer solenoid. For stray or shunt to ground, assume the solenoid is a cylinder in a box or above a ground
/archives//html/Amps/2005-04/msg00132.html (7,500 bytes)

69. Re: [Amps] Input Circuit (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Sat, 28 May 2005 15:52:37 +0100
Since you are going to all the effort to build an amp, why not build in the input filter? The GS35B does not present a constant input impedance of 50 ohms and the input filter can act as an integrato
/archives//html/Amps/2005-05/msg00312.html (7,363 bytes)

70. [Amps] Plate Choke (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Wed, 10 Aug 2005 06:43:36 +0100
All, I just finished sacrificing 12" of Teflon bar stock to the 2xGS35b project this evening. The result is a 320uH inductor in 2 sections. I will sweep the unit tomorrow at work and report back with
/archives//html/Amps/2005-08/msg00363.html (6,597 bytes)

71. Re: [Amps] Plate Choke (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Thu, 25 Aug 2005 07:29:57 +0100
Progress on testing the choke: 2 series resonance dips in the 30MHz spectrum. 1st dip at 7.1MHz and second at 14.3MHz, clean above and below. Tested on grounded Al plate with coils normal (vertical)
/archives//html/Amps/2005-08/msg00665.html (8,006 bytes)

72. Re: [Amps] plate choke (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Thu, 25 Aug 2005 14:44:46 +0100
So, Are you telling me that at every operating frequency of the amp I have to design the plate choke so that it has a parallel resonance? That is impossible without adding some sort of tuning mechani
/archives//html/Amps/2005-08/msg00669.html (9,550 bytes)

73. Re: [Amps] plate choke (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Fri, 26 Aug 2005 05:33:25 +0100
So, many of the plate chokes I have seen described in home brew amplifiers and those in use in Ameritron, Henry, Alpha and QRO are single layer wound solenoids, many like the one I built. These do no
/archives//html/Amps/2005-08/msg00685.html (10,381 bytes)

74. [Amps] stepper motors (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Thu, 15 Sep 2005 02:44:12 +0100
I am (still) in the process of designing my dual gs35b amp and would like some advice on stepper motor selection. I have 2 Russian vacuum variable caps that I want to motorize and wonder if anyone on
/archives//html/Amps/2005-09/msg00124.html (6,986 bytes)

75. Re: [Amps] AC wiring (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Thu, 20 Oct 2005 15:25:39 +0100
Per the comment below on power supplies drawing non sinusoidal current, almost all modern computer power supplies are now switch mode types and draw pure sine wave current in phase with the voltage.
/archives//html/Amps/2005-10/msg00499.html (12,425 bytes)

76. Re: [Amps] Rf choke (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Tue, 22 Nov 2005 03:44:59 +0000
Here are my results after building an RFC for my 2xGS35B amp: Progress on testing the choke: 2 series resonance dips in the 30MHz spectrum. 1st dip at 7.1MHz and second at 14.3MHz, clean above and be
/archives//html/Amps/2005-11/msg00422.html (10,494 bytes)

77. Re: [Amps] GS-35B tuned input (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Tue, 22 Nov 2005 03:45:08 +0000
This is the design I'm going with: I am driving 2 x GS35b for max legal limit with plenty of tube life. Planning on input power in the range of 100W. Here are my values obtained with ELSIE v2.01: Cin
/archives//html/Amps/2005-11/msg00423.html (8,377 bytes)

78. [Amps] Is solid Cu 600VAC house wire, good for tank toroids? (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Thu, 05 Jan 2006 05:49:43 +0000
All, While testing some cores in the shop tonight I happened to grab a hunk of 10AWG solid Cu insulated house wire and threw 10 turns on a T400 core. It sure was pretty, all red and grey with big whi
/archives//html/Amps/2006-01/msg00169.html (6,889 bytes)

79. Re: [Amps] Is solid Cu 600VAC house wire, good for tank toroids? (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Thu, 05 Jan 2006 06:58:12 +0000
Full Legal Limit... _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-01/msg00171.html (8,170 bytes)

80. Re: [Amps] Plate choke and bypassing (score: 1)
Author: KD7QAE <KD7QAE@ARRL.NET>
Date: Sat, 07 Jan 2006 04:38:49 +0000
An ungapped ferrite toroid will not support DC current without saturating. Powdered Iron has a distributed gap and will support DC current. Tomm _______________________________________________ Amps m
/archives//html/Amps/2006-01/msg00238.html (8,533 bytes)

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