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References: [ +from:Ian: 2098 ] [ White: 4243 ]

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101. [Amps] Fans for 4cx1000/1500 question (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 5 Mar 2002 14:22:03 +0000; Agreed about the cardboard box mock-up, just to see if the blower is big enough. Broadening the answer, it is better to measure the cfm directly by letting the exhaust air blow up a thin plastic bag,; /archives//html/Amps/2002-03/msg00097.html (10,614 bytes)
102. [Amps] Fans for 4cx1000/1500 question (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 5 Mar 2002 22:49:38 +0000; These pressure figures only relate to the one particular method of blowing: upward through the socket, chimney and anode cooler in series. For other methods of blowing, the pressure drops will be dif; /archives//html/Amps/2002-03/msg00104.html (9,559 bytes)
103. [Amps] Fans for 4cx1000/1500 question (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 5 Mar 2002 22:43:20 +0000; Just as practical as it is on VHF and above, where it is the standard method. The only reason it isn't used so much on HF is because many people feel it's OK to let RF wander all around the insides o; /archives//html/Amps/2002-03/msg00105.html (9,492 bytes)
104. [Amps] Glitch resistors (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 8 Mar 2002 18:38:49 +0000; Do you mean: "Not needed with LC filter, only C filter. Right?" If so, the answer's No - wrong. They both have a C on the output, and there is more than enough energy stored in a typical C to damage; /archives//html/Amps/2002-03/msg00188.html (10,078 bytes)
105. [Amps] Triode and Tetrode Boards kits - UK and Europe only (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 13 Mar 2002 17:05:03 +0000; This is for the UK and Europe only (apologies to all others for the bandwidth). Normally I do not sell kits of components for my Triode Board and Tetrode Boards, because you can buy them from supplie; /archives//html/Amps/2002-03/msg00278.html (7,819 bytes)
106. [Amps] 10 Meters (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 14 Mar 2002 09:08:02 +0000; I remember having great difficulty getting a weak Spanish station to understand the phonetic "Sierra" in my callsign (in spite of it being a Spanish word) but the longer "Santiago" worked immediately; /archives//html/Amps/2002-03/msg00287.html (9,617 bytes)
107. [Amps] config cathode-drive Amp with a Tetrode? (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 15 Mar 2002 17:19:13 +0000; Option 1 will work with some tubes, but it is not what the original tube designer intended (g1 and g2 of a tetrode are supposed to be at different potentials). Some tubes will handle this type of ope; /archives//html/Amps/2002-03/msg00351.html (8,558 bytes)
108. [Amps] MOV's (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 16 Mar 2002 00:59:29 +0000; That's certainly true in this case, where the switching surge and the energy to be absorbed are completely predictable. To choose the right MOV for this kind of protection you only need the good engi; /archives//html/Amps/2002-03/msg00364.html (8,479 bytes)
109. [Amps] G3SEK change of e-mail (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Tue, 19 Mar 2002 18:19:45 +0000; Sorry to say that I've lost the ifwtech.com domain... If anyone has e-mailed me in the past week, please can you send it again to the new address. Also please update e-mail address books and bookmark; /archives//html/Amps/2002-03/msg00423.html (6,672 bytes)
110. [Amps] calculations (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.co.uk (Ian White, G3SEK); Date: Thu, 21 Mar 2002 21:14:58 +0000; The step-by-step worked example is exactly your pi-network problem. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) New e-mail: g3sek@ifwtech.co.uk New we; /archives//html/Amps/2002-03/msg00480.html (7,916 bytes)
111. [Amps] Re: HV Voltmeters (score: 147): 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)
112. [Amps] SB-220 tuning cap needed (score: 147): 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)
113. [Amps] Good Source for HV Probe? (score: 147): 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)
114. [Amps] Re: [Amps] Bird® 43 Manual (score: 147): 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)
115. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manual (score: 147): 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)
116. [Amps] Re: [Amps] Re: [Amps] Re: [Amps] Bird® 43 Ma nual (score: 147): 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)
117. [AMPS] Alpha 76 and 78 tube conversions (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 2 Feb 2002 15:13:43 +0000; Part of the problem with using a GI7 as a 3CX400 substitute in an existing amp is the massive sand-cast anode cooler, which takes up a lot of space and is really not very efficient - it only works be; /archives//html/Amps/2002-02/msg00023.html (11,672 bytes)
118. [AMPS] gs35 internals (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 18 Feb 2002 07:28:38 +0000; Yup, they're there. Love that tea-strainer grid - real agricultural engineering! In more detail, please can you confirm which (if any) of the arcs has either (a) holed the grid, (b) marked the cathod; /archives//html/Amps/2002-02/msg00179.html (7,854 bytes)
119. [AMPS] gs35 internals (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 18 Feb 2002 11:30:57 +0000; Thanks, Steve... very interesting. It confirms that arcs from anode to grid do affect the cathode underneath as well. Any idea how the tube went dud? Did it ever work, or might it have been soft on a; /archives//html/Amps/2002-02/msg00184.html (7,962 bytes)
120. [AMPS] mof resistors (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 23 Feb 2002 23:52:22 +0000; In Europe, small resistors are available in both carbon film (cheaper, higher tolerance) and metal film (a little more expensive but also closer tolerance). Medium power (1-3W) are almost exclusively; /archives//html/Amps/2002-02/msg00252.html (10,885 bytes)

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