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81. [Amps] Re: HV Voltmeters (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Sat, 23 Mar 2002 19:11:40 +0000; Are we actually talking about 100 or 500 *micro*amps here? -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) New e-mail: g3sek@ifwtech.co.uk New website: ht; /archives//html/Amps/2002-03/msg00544.html (8,504 bytes)
82. [Amps] SB-220 tuning cap needed (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Mon, 25 Mar 2002 14:18:57 +0000; There was also the case (reported here a year or two ago) where an inline lightning protector arced when the amp was in use, reflecting an unpleasant mismatch back up the cable to the tank circuit. I; /archives//html/Amps/2002-03/msg00576.html (8,101 bytes)
83. [Amps] Good Source for HV Probe? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Tue, 26 Mar 2002 21:07:26 +0000; As Rich says, a home-made 1000 to 1 probe can work just fine. Mine is very similar to Rich's. It uses a string of ordinary 10M 0.25W 350V metal film resistors in the barrel of a plastic pen... must h; /archives//html/Amps/2002-03/msg00603.html (9,560 bytes)
84. [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Thu, 28 Mar 2002 12:25:21 +0000; A large part of this problem is the assumption that the Bird 43 measures forward and reflected power. It does not. Look at what's in the slug. It is a short pickup line which is both inductively and; /archives//html/Amps/2002-03/msg00641.html (11,171 bytes)
85. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Thu, 28 Mar 2002 21:51:30 +0000; I agree with Gary - zero RF power is being generated in that idealized worst case of exactly zero or infinite impedance. It may be more helpful to get away from those zeros and infinities, and think; /archives//html/Amps/2002-03/msg00669.html (10,915 bytes)
86. [Amps] Re: [Amps] Re: [Amps] Re: [Amps] Bird® 43 Ma nual (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Fri, 29 Mar 2002 20:01:53 +0000; I stand corrected by both Mike and Bert. [Sorry, we now have visitors for Easter so I'll have to bow out for a few days.] -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist fo; /archives//html/Amps/2002-03/msg00682.html (9,855 bytes)
87. Re: [Amps] 2879 biasing (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sun, 24 Aug 2003 09:41:22 +0100; Steve Thompson wrote: -- Original Message -- From: Gene Bigham <jbigham2@kc.rr.com> To: <amps@contesting.com> Sent: 22 August 2003 19:18 Subject: [Amps] 2879 biasing I have ordered a matched quad of; /archives//html/Amps/2003-08/msg00023.html (8,624 bytes)
88. Re: [Amps] PS Theory ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 28 Aug 2003 18:50:26 +0100; Bill Turner wrote: On Wed, 27 Aug 2003 06:23:40 -0400, "Mike, K8LH" <k8lh@kramerairtool.com> wrote: How can you determine the power handling capability of a transformer??? ___________________________; /archives//html/Amps/2003-08/msg00063.html (12,042 bytes)
89. Re: [Amps] 4CX350A for VHF? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 28 Aug 2003 20:45:41 +0100; ad5gb wrote: Greetings all, I was just given a shiny new pair of 4CX350As. I thought of trying to make a little desktop amp for 2M out of them but a quick look at Eimac's web page at the specs make m; /archives//html/Amps/2003-08/msg00068.html (8,168 bytes)
90. Re: [Amps] PS Theory ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 30 Aug 2003 20:10:39 +0100; on4kj wrote: " KAPP's diagram " Pencil and Paper , and a good revision of the theory.... thats all you need. We are Radio Amateurs, aren't we . To predict power supply performance *accurately* with o; /archives//html/Amps/2003-08/msg00085.html (9,158 bytes)
91. Re: [Amps] PS Theory ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 30 Aug 2003 20:20:33 +0100; Steve Thompson wrote: On Thursday 28 August 2003 06:39, Skram, Helge (MED) wrote: The peak current will depend on capacitors and resistances. Peak current can be very high. What is important ia avera; /archives//html/Amps/2003-08/msg00086.html (10,049 bytes)
92. Re: [Amps] PS Theory ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 1 Sep 2003 08:30:33 +0100; rlm wrote: ** Approximation formulae are given in: http://www.somis.org/D.amplifiers.2.html The math is multification and division. Those really aren't approximation formulae. They are handy practica; /archives//html/Amps/2003-09/msg00002.html (8,763 bytes)
93. Re: [Amps] PS Theory ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 1 Sep 2003 15:55:19 +0100; rlm wrote: ** Ian -- Does the PSU Designer program have an entry for Mains Resistance?. Well, kind-of. It has a little calculator where you can work out the effective secondary resistance, which incl; /archives//html/Amps/2003-09/msg00010.html (8,334 bytes)
94. Re: [Amps] PS Theory ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 2 Sep 2003 19:00:22 +0100; rlm wrote: rlm wrote: ** Ian -- Does the PSU Designer program have an entry for Mains Resistance?. Well, kind-of. It has a little calculator where you can work out the effective secondary resistance,; /archives//html/Amps/2003-09/msg00020.html (10,073 bytes)
95. [Amps] Re: PS Theory (cap int res) (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Wed, 3 Sep 2003 19:47:45 +0100; kenw2dtc wrote: I have a bank of these computer grade caps in series: 2400 mfd at 450 vdc, 2.5 inches in diameter and 4 inches long. It looks like the PSU Designer program shows noticeable ripple if; /archives//html/Amps/2003-09/msg00027.html (9,373 bytes)
96. Re: [Amps] Mail Order Operations (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 6 Sep 2003 09:01:49 +0100; rlm wrote: FWIW I have had many pleasant and honest dealings with hams from Canada, the US and the UK over (too) many years. 99% of the Canadian Hams that I have sold suppressor retrofit kits to have; /archives//html/Amps/2003-09/msg00056.html (8,814 bytes)
97. Re: [Amps] X-TRA TUBE DAYS (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 11 Sep 2003 14:21:31 +0100; Dr. David Kirkby wrote: I do wonder with the increased use of surface mount components, this is going to become more and more difficult in years to come. Many chips are now only available surface mou; /archives//html/Amps/2003-09/msg00103.html (10,608 bytes)
98. Re: [Amps] Chimney Construction (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 13 Sep 2003 08:19:28 +0100; ARNE GJERNING wrote: Looking for best method to bond silicon rubber sheet 1/8 and 3/16 thick for tube chimney. About 4 inch id. Have heard this is not easy task. For TEFLON sheet 0.030 thick what is; /archives//html/Amps/2003-09/msg00113.html (8,785 bytes)
99. Re: [Amps] Tufnol rod (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 16 Sep 2003 16:53:52 +0100; G3RZP wrote: Has anyone had any experience with the machinable ceramics now available e.g. from Farnell in the UK? They look ideal for a lot of amps applications, although rather expensive. If they'r; /archives//html/Amps/2003-09/msg00142.html (8,777 bytes)
100. Re: [Amps] Lossy rod stock for coils (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Tue, 16 Sep 2003 16:59:41 +0100; John T. M. Lyles wrote: Saying you have Tufnol rod is similar to me saying I have some Dupont plastic rod to try. Tufnol have diversified into plastics distribution as well, but they still also manuf; /archives//html/Amps/2003-09/msg00143.html (7,539 bytes)

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