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81. Re: [Amps] finger stock (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Fri, 02 Jan 2009 06:36:57 -0800
In the UK try Farnell, in US possibly Newark. You didn't sign with your call, where are you located? David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com
/archives//html/Amps/2009-01/msg00003.html (7,566 bytes)

82. Re: [Amps] Interesting site (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Thu, 15 Jan 2009 14:18:49 -0800
See them in the flesh at Friedrichshafen David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-01/msg00129.html (7,112 bytes)

83. Re: [Amps] Silver plated braid (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Wed, 21 Jan 2009 10:41:09 +0000
I think most (all) ptfe or Teflon insulated coax uses silver plated braid David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com
/archives//html/Amps/2009-01/msg00193.html (7,187 bytes)

84. Re: [Amps] Regulated DC heater (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Mon, 26 Jan 2009 18:18:02 +0000
Charlie It is convention to quote ALL voltages in rms values unless otherwise stated. Therefore, 5V ac has the same heating effect as 5V dc. David G3UNA ______________________________________________
/archives//html/Amps/2009-01/msg00302.html (8,233 bytes)

85. Re: [Amps] Crydom Solid State Relays (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Thu, 29 Jan 2009 14:52:05 -0800
I've often started with 10n to 100n and a 100R resistor. I use resistors with a body length of around >10mm for handling 240Vac and I use mains rated capacitors or >600Vdc. I like the modern X and Y
/archives//html/Amps/2009-01/msg00355.html (15,906 bytes)

86. Re: [Amps] High voltage/wattage zeners (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sun, 08 Feb 2009 07:32:41 -0800
For that power level you will need stud-mounted devices. I'm sure Newark will do them. You could also use a darlington transistor a zener and resistor. Whatever you use, you will have to have a fairl
/archives//html/Amps/2009-02/msg00200.html (8,084 bytes)

87. Re: [Amps] 50 watt zeners (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Tue, 10 Feb 2009 10:29:54 -0800
Power zeners might be more popular if they were made in T0-220 package, like power resistor are these days. Stud mount devices are so fiddly and disproportionately expensive, too. David G3UNA _______
/archives//html/Amps/2009-02/msg00272.html (7,980 bytes)

88. Re: [Amps] Low Power (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Mon, 2 Mar 2009 10:44:32 +0000
The other aspect of running constantly at 100W is the temperature of the finals and drivers: that would concern me much more. The MTBF drops like a stone at constant high temperature; everything else
/archives//html/Amps/2009-03/msg00043.html (11,785 bytes)

89. Re: [Amps] caps across rectifier diodes (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Tue, 3 Mar 2009 15:24:20 +0000
Funny you should say that: years ago when I was having a mil psu tested at Dayton T Brown, they noticed a spike around 21MHz and they said that was due to the input rectifiers. Don't recall how it wa
/archives//html/Amps/2009-03/msg00093.html (10,074 bytes)

90. Re: [Amps] Step-start; improved circuit. (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sat, 07 Mar 2009 05:24:36 -0800
For relay driving I prefer the 555 timer as it does not require a drive transistor to the relay, fewer parts to make a good quality timer. David G3UNA _______________________________________________
/archives//html/Amps/2009-03/msg00227.html (9,359 bytes)

91. Re: [Amps] winding an HV transformer (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Wed, 1 Apr 2009 15:16:43 +0100
Putting in the feedback to regulate the output is not entirely straightforward, unless someone has done it all for you. The inductor in the output is related to the compensation components around the
/archives//html/Amps/2009-04/msg00004.html (8,408 bytes)

92. Re: [Amps] Silver plating (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Fri, 10 Apr 2009 09:34:08 +0100
Sorry if I am repeating what someone might have already given "performance of electroplated finishes" fowler http://k6mhe.com/n7ws/Plating.pdf David G3UNA ____________________________________________
/archives//html/Amps/2009-04/msg00119.html (8,249 bytes)

93. Re: [Amps] High SWR, (score: 1)
Author: <d.cutter@ntlworld.com>
Date: Thu, 23 Apr 2009 12:40:52 +0100
Give every man thine ear, but few thy voice; take each man's censure but reserve thy judgement. - William Shakespeare (April 26, 1564 - April 23, 1616) David G3UNA ___________________________________
/archives//html/Amps/2009-04/msg00244.html (13,985 bytes)

94. Re: [Amps] Source wanted for HV switch-mode power supply (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Wed, 20 May 2009 22:39:37 +0100
If you haven't done a switcher with feedback before, I would stay with the design as it is for the first run. When you have the bugs out, then think about feedback. You will need more turns on the se
/archives//html/Amps/2009-05/msg00139.html (10,707 bytes)

95. Re: [Amps] HV switch-mode power supply (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sat, 23 May 2009 18:21:01 +0100
I operated from a refurbished 18th century water mill a couple of weeks ago. They are using an Archimedean screw generator to deliver 25kW from a quite small part of a small river with only 4ft or so
/archives//html/Amps/2009-05/msg00172.html (10,069 bytes)

96. Re: [Amps] Asynchronous coax matching transformer (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sun, 2 Aug 2009 08:16:35 +0100
Would someone please fill me in with the distinction between synchronous and asynchronous? David G3UNA Thanks to Larry and Gerald for pointing out that the series method is much more versatile than I
/archives//html/Amps/2009-08/msg00021.html (10,551 bytes)

97. Re: [Amps] Watts to DBM?? (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Fri, 25 Sep 2009 10:20:42 +0100
1mW is 0dBm, 2mW is 3dBm, 4mW is 6dBm, 8mW is 9dBm, 16mW is 12dBm, 32mW is 15dBm etc David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2009-09/msg00303.html (8,374 bytes)

98. Re: [Amps] Searching for a 110v 5w Zener (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sat, 24 Oct 2009 15:17:36 +0100
Andy If you can't find the exact value you need, use 2 or more in series, they're cheap enough. I see the 56V 1N5370BG is in stock with Farnell at 39p each. David G3UNA ______________________________
/archives//html/Amps/2009-10/msg00313.html (8,737 bytes)

99. Re: [Amps] Searching for a 110v 5w Zener (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Sat, 24 Oct 2009 15:58:45 +0100
As long as you are sure about the dissipation rating that you need, then one taking a little more than the other is fine. Expect +/-5% tolerance on each part and an additional change with temperature
/archives//html/Amps/2009-10/msg00315.html (8,678 bytes)

100. Re: [Amps] "Stacking" power supplies?? how? (score: 1)
Author: "David Cutter" <d.cutter@ntlworld.com>
Date: Tue, 15 Dec 2009 11:56:58 -0800
If you can get inside the power supplies and find the reference diode, use just one of the 3 and join the rest to it, taking the others out of circuit. This way most of the differential drift (ie dri
/archives//html/Amps/2009-12/msg00344.html (9,069 bytes)

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