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41. [Amps] BLV25 amplifier (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 8 Apr 2002 11:23:11 -0600; A Philips BLV25 transistor power amplifier is shown in their application report NCO8202, dated 1982 by H. G. van Hees in Nijmegen, the Netherlands. It was capable of 300 watts from 88 to 108 MHz, fro; /archives//html/Amps/2002-04/msg00241.html (7,967 bytes)
42. [Amps] Burle/RCA (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 8 Apr 2002 11:30:37 -0600; At work we are major customers of Burle tubes, as they still make the RCA designs, and many of these are sole sourced for high pulsed power UHF applications. They also make some U/VHF television tran; /archives//html/Amps/2002-04/msg00242.html (6,339 bytes)
43. [Amps] new paper on VHF TV and 6 meters (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 12 Apr 2002 12:48:04 -0600; Harris Broadcast Communications has printed a technical support paper, "Low Band VHF Television Transmission and Amateur Radio Operation" in January, which comprehensively analyzes the condition in w; /archives//html/Amps/2002-04/msg00323.html (7,622 bytes)
44. [Amps] Svetlana 572 or 811 (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 24 Apr 2002 08:23:25 -0600; According to the datasheets I have from Svetlana, 572B (8/97) is not the same animal than 811A (3/97). Curves are definitely different. 572 is rated 160 watt dissipation in class B linear RF service,; /archives//html/Amps/2002-04/msg00538.html (7,671 bytes)
45. [Amps] 811/572 triodes (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 26 Apr 2002 10:40:01 -0600; I see your point now, that at the 30L1 operating conditions, they two triodes play almost the same. If you had a blank sheet of paper to redesign and wanted to utilize the 572 for more whoopie like i; /archives//html/Amps/2002-04/msg00565.html (7,381 bytes)
46. [Amps] 10 Meters (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 12 Mar 2002 12:51:56 -0700; I was mobile QRP (5 watts) this past weekend, while crossing USA in automobile. 10 meters was hot, lotta DX. I was was surprised by a number of sounding stations. A lot of high powered stations in Eu; /archives//html/Amps/2002-03/msg00258.html (8,359 bytes)
47. [Amps] idea for discharging caps (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 18 Mar 2002 16:26:48 -0700; A nice idea for discharging power supply capacitors appears in EDN magazine, March 7, page 121-2, by Stephen Woodward of Univ. of NC. He uses a double pole double thow power switch on the primary of; /archives//html/Amps/2002-03/msg00409.html (6,868 bytes)
48. [Amps] info on toobes (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 21 Mar 2002 14:15:36 -0700; Marconi Applied Technology makes the former EEV (English Electric Valve) power tubes. They have a nice website now with tech notes for power tubes. They are still in business it seems, although the t; /archives//html/Amps/2002-03/msg00481.html (6,633 bytes)
49. [Amps] ticking capacitors (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 25 Mar 2002 11:08:14 -0700; I have to add my 2 cents to this quote below. At my workplace we use some fairly large oil filled capacitors for energy storage for the pulsed RF systems. Each B+ supply for klystrons (they don't cal; /archives//html/Amps/2002-03/msg00577.html (7,886 bytes)
50. [Amps] hv probe (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 26 Mar 2002 12:37:35 -0700; HV Probes: Inexpensive <-> high voltage? The two aren't synonomous now. Expect to spend about $75-150 for a HV probe, more for an accurate one for a DMM. A standalone unit with a small analog movemen; /archives//html/Amps/2002-03/msg00602.html (7,847 bytes)
51. [AMPS] insulator posts, HV breakdown (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 1 Feb 2002 12:59:49 -0700; With respect to failing insulators: The moisture ingress into the porcelan post insulators is probably a factor, if they are unglazed on the ends. There are two other reasons to consider, that could; /archives//html/Amps/2002-02/msg00009.html (8,404 bytes)
52. [AMPS] HA10? (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 22 Feb 2002 09:17:03 -0700; Re: Heath HA10. Is that the same as a Warrior? About a year ago I was looking for a KW1 Chippewa with the KS1 power supply. I found one in Redmond, WA, area and saw it while visiting there. It had be; /archives//html/Amps/2002-02/msg00229.html (6,880 bytes)
53. [AMPS] switch info (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 7 Jan 2002 11:24:20 -0700; DB Products makes coaxial RF switches in various sizes. I got an ad in the mail, listing a part called the 2NHV high power vacuum switch. Says it is Dc-400 MHz rated, for up to 1kW CW. Looks like a v; /archives//html/Amps/2002-01/msg00068.html (6,627 bytes)
54. [AMPS] bias regulator (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 30 Jan 2002 08:16:44 -0700; Xicor has introduced a Bias regulator chip made especially for use with LDMOS RF transistors. It uses active feedback from a drain current sensing resistor, to adjust the gate bias to keep the part a; /archives//html/Amps/2002-01/msg00309.html (9,190 bytes)
55. [AMPS] Higher Power Pentodes? (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 31 Jan 2002 10:00:46 -0700; I agree with the assumption that building large pentodes is more difficult. Alignment of wire grids for G1 and screen G2 is difficult with the older technology, to get consistent results from batch t; /archives//html/Amps/2002-01/msg00376.html (8,086 bytes)
56. [AMPS] another myth on EMF (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 5 Nov 2001 09:39:12 -0700; Cellphones cause brain tumors...... In study after study, the link of 800-1800 MHz RF emissions to cancer has NOT been scientifically proven. RF heating, some affects on nerves, auditory affects at p; /archives//html/Amps/2001-11/msg00048.html (9,759 bytes)
57. [AMPS] EMF effects (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 6 Nov 2001 12:00:50 -0700; Have you had your daily dose of RF yet? I had mine already while driving to work. K5PRO -- -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests:; /archives//html/Amps/2001-11/msg00094.html (8,108 bytes)
58. [AMPS] PCB oil info (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 7 Nov 2001 11:42:36 -0700; The answer is not real clear on identifying PCBs in electronics, namely in capacitors and in tanked transformers. Several years ago I called several commonly found cap. manufacturers and learned this; /archives//html/Amps/2001-11/msg00131.html (8,115 bytes)
59. [AMPS] non inductive R (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 7 Nov 2001 12:01:12 -0700; In college I remember the late Herb Krauss (co-wrote Solid State Radio Engineering) telling us that 100 Ohm carbon comp resistor (1/2, 1 or 2 Watt size, i cannot remember which) was quite good as the; /archives//html/Amps/2001-11/msg00132.html (6,911 bytes)
60. [AMPS] amplifier conversion (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sat, 10 Nov 2001 09:44:35 -0700; For a look at something built for HF with handles (screw eye hooks), there is a neat article in the 1997 IEEE Plasma Physics Conf proceedings, by folks at Princeton. They converted the 800 kW CW, 80; /archives//html/Amps/2001-11/msg00160.html (7,204 bytes)

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