Mail Archive Search: <+from:jtml@lanl.gov>

Results:

References: [ +from:jtml@lanl.gov: 562 ]

Total 562 documents matching your query.

121. [AMPS] noise (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 19 Jan 2001 10:45:17 -0700; This was seen on the AM Window mailing list: I suspect that a rash of chatter may crop up after posting this. Why do so many CB'ers, nonlicensed or out of band LIDs use so much reverb and echo on the; /archives//html/Amps/2001-01/msg00497.html (7,961 bytes)
122. [AMPS] blown grid wires (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Fri, 19 Jan 2001 10:50:14 -0700; A significant failure mode of some gridded vacuum tubes is cathode damage from ion bombardment during discharges. Another indication is holes in the grid from the pass thru energy. I have a photo of; /archives//html/Amps/2001-01/msg00498.html (6,786 bytes)
123. [AMPS] SPICE model (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 22 Jan 2001 09:55:20 -0700; Thanks for posting the SPICE analysis for 3-500Z arc over, Ian. There are folks who poo-poo SPICE models (such as Bob Pease, the National Semiconductor guy), but I belive that they have value in tran; /archives//html/Amps/2001-01/msg00558.html (7,000 bytes)
124. [AMPS] series R (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 4 Dec 2000 15:59:21 -0700; We developed a new crowbar and series resistor (glitch resistor as you call it, crowbar resistor as we call it) in 1996 for the 30 kV, 250 Amp plate power supplies for our triodes. The resistor is ma; /archives//html/Amps/2000-12/msg00066.html (7,387 bytes)
125. [AMPS] more tubes (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 5 Dec 2000 14:39:05 -0700; I just got a new catalog from Marconi Applied Technologies, the new name for English Electric Valve. They have dropped the second sourcing of Eimac-style 3CX, 3CW and 4CX, 4CWxxxx triodes and tetrode; /archives//html/Amps/2000-12/msg00086.html (7,012 bytes)
126. [AMPS] RF engineering (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 18 Dec 2000 10:57:54 -0700; I am getting gray but I haven't reached the half century point yet. I was about 2 when Sputnik beeped. As I have felt many times, working around RF fields seems to keep us - appearing - youthful. Wir; /archives//html/Amps/2000-12/msg00267.html (8,443 bytes)
127. [AMPS] #445, Hp675A (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 13 Nov 2000 12:18:29 -0700; Phil, I spent several years working with one in production work in 1978-80. The Hp675A sweeper is ancient Hp technology, all transistor. But nothing wrong with it. It needs optional crystal oscillato; /archives//html/Amps/2000-11/msg00123.html (11,614 bytes)
128. [AMPS] additional info on Hp675A (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Mon, 13 Nov 2000 12:21:14 -0700; I forgot to include the WWW link for Wide Band Engineering's application note on using return loss bridges and sweep generators: http://www.wbecoinc.com/bsetup1.html 73 John K5PRO -- FAQ on WWW: http; /archives//html/Amps/2000-11/msg00124.html (7,248 bytes)
129. [AMPS] connectors and spark plugs (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 22 Nov 2000 11:34:31 -0700; Both of the topics I see discussed here are things I had to deal with also in the past few years. The type N connectors kept blowing up at 4 kW peak RF, 200 MHz, when VSWR crept up during tuning. THi; /archives//html/Amps/2000-11/msg00316.html (8,893 bytes)
130. [AMPS] measuring under power (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 12 Oct 2000 13:22:23 -0600; The OIB series is made to work around broadcast arrays, up to about +/- 400j reactance and I forget the real range. I used to work for Delta Electronics Inc, and we hand calibrated every one of them.; /archives//html/Amps/2000-10/msg00246.html (9,585 bytes)
131. [AMPS] getters (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 17 Oct 2000 13:28:34 -0600; W8JI sez: Larger external anode tubes do have special getters that are used during the manufacturing, just after pinch off of the vacuum tube. RCA/Burle uses a glass enveloped thing with some getter; /archives//html/Amps/2000-10/msg00445.html (8,319 bytes)
132. [AMPS] screen power (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 18 Oct 2000 09:41:57 -0600; We use switching or linear regulated supplies for screen power, charging a large capacitor. A crowbar is nice, but small series R is often adequate. The foil hole test should be done. By the way, our; /archives//html/Amps/2000-10/msg00462.html (8,145 bytes)
133. [AMPS] RF high power tube (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 19 Oct 2000 09:31:12 -0600; 4CM400,000G is probably costing around $45K new, but I am guessing. The 4CM300000GA was $38K three years ago when I inquired. It is not the highest power tube, but strictly radio transmitters, it is; /archives//html/Amps/2000-10/msg00471.html (8,676 bytes)
134. [AMPS] RF high power tube (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 19 Oct 2000 17:09:42 -0600; I am not a fusion expert, but I believe it is Inductive Coupled Resistive Heating. John -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: am; /archives//html/Amps/2000-10/msg00473.html (6,868 bytes)
135. [AMPS] arcing vacuum tubes (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 5 Sep 2000 09:44:41 -0600; If the tube repeatedly arcs, it needs to be replaced. MY EXPERIENCE SUPPORTS THIS PRACTICE, BUT ONLY IN VERY HIGH POWER TUBES IN PARTICULAR: The 'debarnacling' of tubes is a routine practice, esp at; /archives//html/Amps/2000-09/msg00105.html (9,042 bytes)
136. [AMPS] source of all sources (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 5 Sep 2000 10:00:48 -0600; You might also want to see the WLW 500 kW equipment which Fyler (at General Electric) wrote his paper about. Those RCA UV-862 triodes were 60 inches long, with 21 inches from the filament connection; /archives//html/Amps/2000-09/msg00108.html (7,439 bytes)
137. [AMPS] heating tubes.... (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Wed, 6 Sep 2000 09:28:55 -0600; Interesting, my comrades at Brookhaven Nat Lab in NY do this with new Burle 7835 triodes. They detune the PA output, and run the tube off resonance. They then drive them to get the dissipation at 100; /archives//html/Amps/2000-09/msg00146.html (8,719 bytes)
138. [AMPS] keep it simple, with good parts (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 7 Sep 2000 10:02:21 -0600; I agree that the components, esp tubes, have improved since the early designs. Capacitors are similarly lower L, and higher self-resonance. For instance, to bypass the filament leads coming out of a; /archives//html/Amps/2000-09/msg00216.html (11,528 bytes)
139. [AMPS] failure modes in large tetrodes (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Tue, 12 Sep 2000 14:27:17 -0600; In 1994, working with a tube rebuilder, Econco, we autopsied several 4CW250,000B tetrodes, all Eimac builds from the 1980s. These tubes were used in our plate modulators as the series tube, a paralle; /archives//html/Amps/2000-09/msg00563.html (9,275 bytes)
140. [AMPS] did someone say Tesla? (score: 1): Author: jtml@lanl.gov (John T. M. Lyles); Date: Thu, 14 Sep 2000 19:08:20 -0600; Tesla coil USED to be thought to be an air cored RF transformer but so much work has been done in the past 20 years to advance them, to where people make very efficient tesla coils with voltage gain; /archives//html/Amps/2000-09/msg00733.html (8,695 bytes)

Current List: 121 - 140
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]