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61. Re: [Amps] An Extra Thank You! (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 6 Mar 2009 06:49:08 +0200
...it's not really added. Like Terman said, it's feedthrough power. Remember power in depends on the input RESISTANCE, not impedance and it has to go somewhere, by virtue of the conservation law. Goi
/archives//html/Amps/2009-03/msg00203.html (9,980 bytes)

62. Re: [Amps] 8122 (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Tue, 17 Mar 2009 09:34:53 +0200
..well, I'd like only to add some info about the last item. FET's Do need quite a high idling current, depending on your linearity demands: for really low IMD performance you need also currents in th
/archives//html/Amps/2009-03/msg00459.html (9,710 bytes)

63. Re: [Amps] HV smps (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 26 Mar 2009 10:37:37 +0200
Hi Paul: Where can I get a schematic of the thing? I have about 6 years of design experience with offline SMPS, so I might be able to analyze it and maybe suggest a few tings. 73 and all the best: Al
/archives//html/Amps/2009-03/msg00512.html (8,349 bytes)

64. Re: [Amps] 'red' cores versus 43 cores (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 29 Mar 2009 09:00:27 +0300
What you need is a material with an initial permeability of about 125. Forget about color codes, they pertain only to Micrometals cores! You need a material similar to the 4C6 from Philips, now Epcos
/archives//html/Amps/2009-03/msg00524.html (9,606 bytes)

65. Re: [Amps] 'red' cores versus 43 cores (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Sun, 29 Mar 2009 17:43:55 +0200
Hi guys: I would like to point out a few things 1) The color coded cores pertain specifically to Micrometals. They are intended for inductors, not transformers and the color code indicates for what f
/archives//html/Amps/2009-03/msg00527.html (11,604 bytes)

66. Re: [Amps] 'red' cores versus 43 cores (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 30 Mar 2009 13:50:43 +0300
Hi Jim and all: Like I said in the 1st paragraph, most high power HF transformers ARE wound on ferrite cores. they employ transmission line based windings in which the energy is coupled to the second
/archives//html/Amps/2009-03/msg00535.html (14,385 bytes)

67. Re: [Amps] 'red' cores versus 43 cores (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 30 Mar 2009 14:04:21 +0300
Thanks Manfred, this really sums it up very well! 73 and all the best; Alex 4Z5KS Hi Dan, and all, I will try...! The "red" material is powdered iron with a permeability of 10, while the 43 material
/archives//html/Amps/2009-03/msg00536.html (16,483 bytes)

68. Re: [Amps] winding an HV transformer (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Tue, 31 Mar 2009 11:04:51 +0300
...none! With full wave rectification of a square wave you get the peak to peak voltage of the secondary as the DC output. What scares me after having worked on off line converters for about 6 years
/archives//html/Amps/2009-03/msg00549.html (9,773 bytes)

69. Re: [Amps] winding an HV transformer (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 1 Apr 2009 10:23:32 +0300
Not correct! With a full bridge rectifier you get the peak to peak voltage out as DC! All the diodes do is redirect the transformer secondary to the correct polarity. What you wrote pertains to doubl
/archives//html/Amps/2009-04/msg00000.html (10,409 bytes)

70. Re: [Amps] hv smps (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Wed, 1 Apr 2009 17:48:42 +0200
You can find computer capacitors of 1000uF/200V at about$2 per copy 2 in series,as used in PC supplies mace for 500uF/400VDC caps. How many pairs do you need? Alex 4Z5KS Hi Jeff, Just so you know, mo
/archives//html/Amps/2009-04/msg00006.html (8,338 bytes)

71. Re: [Amps] winding an HV transformer (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 1 Apr 2009 20:17:26 +0300
...not in principle. I have a friend here in 4Zulu Land, designing switchers at about 20 kW levels. They work very nicely and quite a few government agencies use them. The problem seems to be rectifi
/archives//html/Amps/2009-04/msg00007.html (13,397 bytes)

72. Re: [Amps] Silver plating (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 10 Apr 2009 09:56:50 +0300
...usually they do it for esthetic purposes. Ah HF at least, the skin effect occurs at depths greater than the plating, so that a sizeable amount of current still flows in the copper underneath. Not
/archives//html/Amps/2009-04/msg00115.html (10,157 bytes)

73. Re: [Amps] Silver plating (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 10 Apr 2009 10:10:38 +0300
Now that you mention it, I think I read somewhere that cyanide and acid mix is just what they use to carry out executions in a few states. Real sweet!! Alex 4Z5KS --Original Message-- From: amps-boun
/archives//html/Amps/2009-04/msg00117.html (12,009 bytes)

74. Re: [Amps] Silver plating (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 10 Apr 2009 10:58:17 +0300
..if already talking about this subject, I have another question that'll pour oil on the fire: Years ago there were in use Cuproxide rectifiers, which consisted of a small disk of copper, with an oxi
/archives//html/Amps/2009-04/msg00118.html (10,358 bytes)

75. Re: [Amps] Silver plating (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Sat, 11 Apr 2009 20:29:55 +0200
Well, yes, it's been done. Even the VRC-24 radio of WWII vintage had the tank coil plated in gold (30 to 70 MHz operation): it was very FB from the operational point of view. Actually the surface con
/archives//html/Amps/2009-04/msg00130.html (10,185 bytes)

76. Re: [Amps] Power supply question (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 12 Apr 2009 09:28:50 +0300
4X1AT, sadly an SK by now, who was the Israeli Peter Dahl, designed for me a PS transformer with 6 separate secondaries, each one producing 400VDC after rectification. The six secondaries, each with
/archives//html/Amps/2009-04/msg00137.html (9,328 bytes)

77. Re: [Amps] New GS-35B amplifier.. (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 12 Apr 2009 09:51:08 +0300
Mighty curious! The only thing that comes to mind on short notice is something fishy with the dummy load. Could you borrow another one and check by substitution? I had a couple of 100/ 600W resistors
/archives//html/Amps/2009-04/msg00138.html (9,257 bytes)

78. Re: [Amps] Power supply question (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 12 Apr 2009 17:28:26 +0300
..actually, with the usual voltage dividers across the output the voltage goes down quite fast for small overvoltages. Anyhow, a high value resistor, needing to draw 1 or 2 milliamps, is not a bleede
/archives//html/Amps/2009-04/msg00140.html (8,494 bytes)

79. Re: [Amps] High SWR (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Sat, 25 Apr 2009 10:03:01 +0200
... sorry, but something really doesn't fit! RG 213 has a withstand voltage closer to 6000 (six thousand) volts rather than 600! Alex 4Z5KS Huh? 600 Volts? Where did that figure come from? -Rex  K1HI
/archives//html/Amps/2009-04/msg00332.html (10,728 bytes)

80. Re: [Amps] purpose of 3 ohm resisters between base and emitter? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 29 Apr 2009 07:56:16 +0300
Most RF power transistors have a highly reactive, usually capacitive at HF, input impedance. This is in addition to the resistive part of the impedance being highly non linear: it takes values from i
/archives//html/Amps/2009-04/msg00395.html (9,050 bytes)

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