Mail Archive Search: <+from:G3SEK@ifwtech.demon.co.uk>

Results:

References: [ +from:G3SEK@ifwtech.demon.co.uk: 419 ]

Total 419 documents matching your query.

61. R: [AMPS] Watt meters and PEP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 15 Jan 2000 05:06:43 +0000; Yes, obviously. There is nothing wrong with that "v-pk" calculation. What I cannot believe is that the FCC make any use of the quantity that you call "w-pk". 73 from Ian G3SEK Editor, 'The VHF/UHF DX; /archives//html/Amps/2000-01/msg00307.html (8,934 bytes)
62. [AMPS] RF Choke Forms (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 15 Jan 2000 18:20:17 +0000; Because the RF stresses in anode chokes seem to be higher than almost any other application where these materials might be used. There's a lot of variation between different grades of the same plasti; /archives//html/Amps/2000-01/msg00337.html (10,161 bytes)
63. R: [AMPS] Watt meters and PEP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 15 Jan 2000 17:55:23 +0000; More to the point, they don't mention, consider or use your "w-pk" at all. It's one way to calibrate a power meter, but not a good one. Guess how oscilloscopes are calibrated at RF? By measuring the; /archives//html/Amps/2000-01/msg00338.html (9,004 bytes)
64. R: [AMPS] RF Choke Forms (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 15 Jan 2000 23:14:45 +0000; Teflon contains only carbon and fluorine. It is highly stable and will not burn on its own. One of the decomposition products when it's heated to flame temperatures in (moist) air is hydrogen fluorid; /archives//html/Amps/2000-01/msg00352.html (10,098 bytes)
65. R: [AMPS] Watt meters and PEP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 16 Jan 2000 10:55:48 +0000; Go on then, *tell* us how the Y sensitivity of an oscilloscope is calibrated at an arbitrary RF frequency, in a way that is traceable to NIST standards. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book; /archives//html/Amps/2000-01/msg00354.html (8,634 bytes)
66. R: [AMPS] RF Choke Forms (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 16 Jan 2000 14:23:01 +0000; Pretty much. HF is either the gas hydrogen fluoride, or the shorthand name for hydrofluoric acid, the solution of the gas in water (where it dissociates into H+ and F- ions). If HF gas is inhaled, it; /archives//html/Amps/2000-01/msg00356.html (8,568 bytes)
67. [AMPS] dielectric losses (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 24 Jan 2000 18:25:50 +0000; Thanks, John for all that interesting and useful information. Just one small point, in case anyone is getting worried about the DuPont safety information: That's all about handling Teflon/Tefzel in t; /archives//html/Amps/2000-01/msg00510.html (8,112 bytes)
68. [AMPS] Trouble shooting 8877 amp (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 1 Dec 1999 14:14:05 +0000; It certainly sounds like there's no HV getting to the anode. Possibly the RF choke could be burnt out, or something else between the HV meter connection and the tube itself. Not right at the anode -; /archives//html/Amps/1999-12/msg00004.html (8,521 bytes)
69. [AMPS] Tetrode Amp Help (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 9 Dec 1999 08:53:27 +0000; The Eimac advice assumes that you are not using a regulated screen supply, only a "dumb" bleed resistor - but for good linearity and tube protection you MUST regulate the screen voltage closely. When; /archives//html/Amps/1999-12/msg00065.html (9,795 bytes)
70. SV: [AMPS] Tetrode Amp Help (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 9 Dec 1999 20:30:57 +0000; Rich has answered most of your points. I don't remember any drive-variable screen voltage feature in the NAGs that came into this country. Using an IC-202, you must have been one of the few people on; /archives//html/Amps/1999-12/msg00082.html (9,874 bytes)
71. [AMPS] Tetrode Amp Help (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 9 Dec 1999 20:24:16 +0000; The advice that Leigh was quoting comes from Care & Feeding, Section 2.2, which doesn't recognise the need for shunt-regulated screen supplies. Yet another major area for revision... but don't get m; /archives//html/Amps/1999-12/msg00083.html (11,376 bytes)
72. SV:SV:SV: [AMPS] Tetrode Amp Help (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 14 Dec 1999 22:27:37 +0000; - but only if you accept the whole "Collins package", which is a separate (screen-cathode) supply and a separate (screen-anode) supply, connected in series to provide the full anode-cathode voltage w; /archives//html/Amps/1999-12/msg00158.html (10,194 bytes)
73. [AMPS] 4CX250 in G2DAF Circuit (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 17 Dec 1999 08:51:33 +0000; It's nonsense to build a whole argument on the claim that the IMD of a certain tube "is" any particular value. It all depends on the DC/RF operating conditions. Under other conditions, the IMD can be; /archives//html/Amps/1999-12/msg00206.html (8,976 bytes)
74. [AMPS] 4CX250 in G2DAF Circuit (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 18 Dec 1999 13:18:39 +0000; You've hit it exactly with that last sentence. When you tune away from the signal, you want it to be gone completely. This means that higherorder IMD is more important in many ways than 3rd-order. 3r; /archives//html/Amps/1999-12/msg00221.html (9,726 bytes)
75. [AMPS] G2DAF and super cathode (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 18 Dec 1999 23:23:30 +0000; The G2DAF is grid driven across a load resistor, with grounded cathode. The unique feature is that it has neither grid bias nor permanent screen voltage. Instead, the screen voltage is derived by vol; /archives//html/Amps/1999-12/msg00224.html (9,702 bytes)
76. [AMPS] G2DAF and super cathode (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 19 Dec 1999 17:53:41 +0000; For anyone who's interested, I have scanned G2DAF's own description of his amplifier. The page images are downloadable from: http://www.ifwtech.demon.co.uk/g3sek/g2daf.htm (Owing to my ISP's policy o; /archives//html/Amps/1999-12/msg00239.html (8,993 bytes)
77. [AMPS] G2DAF and super cathode (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 19 Dec 1999 22:09:44 +0000; My ISP isn't playing copyright cop - they just want to check that nothing grossly illegal is being uploaded. Come Monday morning (Eu time), the weekday crew will let it through. Copyright law is pret; /archives//html/Amps/1999-12/msg00249.html (9,471 bytes)
78. SV: [AMPS] G2DAF and super cathode (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 19 Dec 1999 22:26:30 +0000; After the holidays, I will ask the RSGB librarian to check G2DAF's own "Single Sideband" column which he wrote in the early 1960s. There are also a few other leads to be followed-up. 73 from Ian G3SE; /archives//html/Amps/1999-12/msg00250.html (9,793 bytes)
79. SV: [AMPS] G2DAF and super cathode (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 20 Dec 1999 07:22:31 +0000; Seems like you already have - all of your messages arrive here twice! 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.demon.co.uk/g3sek --; /archives//html/Amps/1999-12/msg00270.html (8,515 bytes)
80. R: [AMPS] 8877 bias (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 20 Dec 1999 13:46:09 +0000; The TL431 "adjustable zener" with a PNP Darlington pass transistor gives very good voltage regulation - far better than is actually needed - AND it's fully adjustable AND the whole thing costs about; /archives//html/Amps/1999-12/msg00271.html (8,197 bytes)

Current List: 61 - 80
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]