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

Results:

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

Total 562 documents matching your query.

281. [AMPS] Triode Amp Out/In isolation (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 28 May 1998 12:06:18 -0600; Shawn, I agree that 14 DB is a bit short on isolation. If you trust your readings, then you can try and do something about it. Instability of a power amp is sometimes shown as snap, crackle and arc,; /archives//html/Amps/1998-05/msg00611.html (14,694 bytes)
282. [AMPS] series R in plate (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 29 May 1998 13:21:10 -0600; I know this probably doesn't apply to the 10-50 Ohm series R in the plate lead of a PA, but we recently redesigned our series R from our stored energy banks for the 3 MW amplifiers. Used to use a 5 O; /archives//html/Amps/1998-05/msg00652.html (9,160 bytes)
283. [AMPS] NMR experience (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 29 May 1998 17:30:54 -0600; When I used to work for a company in the east, we got calls from all over the place with RF questions, namely EMI problems. Our speciality was industrial RF power systems, but we did measure and char; /archives//html/Amps/1998-05/msg00660.html (9,252 bytes)
284. [AMPS] Collins rig (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 3 Apr 1998 17:30:47 -0700; Fellow amplifier user/builders: We have a Collins 205G-1 amplifier, good for 20 KW SSB from 30-60 MHz I think, made many moons ago. It is BIG, and needs to be surplused. I looked at it, and it is the; /archives//html/Amps/1998-04/msg00027.html (8,178 bytes)
285. [AMPS] to tune or not to tune (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 7 Apr 1998 10:35:18 -0600; I know this discussion started with the no-tune amplifier question. Since we deviated to automatic tuning, I have a couple of suggestions. For years, the military sets (trailing wire, HF high power,; /archives//html/Amps/1998-04/msg00050.html (8,664 bytes)
286. [AMPS] New solid state power (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 9 Apr 1998 17:13:02 -0600; Applied Microwave and Wireless magazine here in the states is showing promise as more than just a trade pub, with Gary Breed as publisher, formerly from RF Design Magazine. I believe that he might be; /archives//html/Amps/1998-04/msg00074.html (7,819 bytes)
287. [AMPS] New solid state power (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 10 Apr 1998 09:34:53 -0600; Applied Microwave and Wireless Magazine is a free trade pub. It is obtained by filling out a qualification card, from Noble Publishing Corp, 4772 Stone Drive, Tucker, GA (770) 908-2320. Their WWW sit; /archives//html/Amps/1998-04/msg00078.html (7,282 bytes)
288. [AMPS] info on warped filaments (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 10 Apr 1998 12:46:51 -0600; In Philips Technical Review, vol 6, No. 7, dated sometime in the 1930's I think, (it's not on the pages i copied), there is an article titled "A DISCHARGE PHENOMENON IN LARGE TRANSMITTER VALVES". J.; /archives//html/Amps/1998-04/msg00081.html (7,473 bytes)
289. [AMPS] Cap arcs (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 17 Apr 1998 11:18:49 -0600; Dick's (WOID) comments about plate alignment and dirt are very valid reasons for cap arcovers. We bought some aluminum capacitors made by (name omitted here) for tuning and then we got some surplus H; /archives//html/Amps/1998-04/msg00126.html (7,489 bytes)
290. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 17 Apr 1998 13:15:23 -0600; While we're on the parasitic subject (sorry to pump the ol' oscillators out there): I once had a disagreement with a competent RF designer of many years experience, who made big RF dielectric heaters; /archives//html/Amps/1998-04/msg00131.html (9,741 bytes)
291. [AMPS] Oscillators with supressors? (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 17 Apr 1998 16:30:53 -0600; Carl sez: Aha! That is an Oxymoron, competent commercial companies (CCC)! Yes, there are some, but then again, there are probably as many who aren't. RF dielectric heating equipment and induction hea; /archives//html/Amps/1998-04/msg00145.html (9,646 bytes)
292. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 17 Apr 1998 16:47:08 -0600; You guys have me sitting up all night, worring about that big parasite that's gonna latch onto my work in the next few weeks. The plate circuit being laid out physically as we speak. The tune C is a; /archives//html/Amps/1998-04/msg00146.html (8,673 bytes)
293. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 20 Apr 1998 11:25:19 -0600; "The way I was taught is that you key the amp with no drive and vary the caps all around and look for a kick in the plate or grid current. Do this on all bands and into a dummy load. If all is quiet; /archives//html/Amps/1998-04/msg00179.html (9,955 bytes)
294. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 21 Apr 1998 13:15:30 -0600; I'm getting sucked in (sorry!). This is a long one, so bear with me, or hit DELETE now: -- PARASITICS I mentioned this before, (back in Dec. 1997) but the 1935 article in Proceedings of the IRE, by G; /archives//html/Amps/1998-04/msg00207.html (15,846 bytes)
295. [AMPS] parasitics (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 23 Apr 1998 09:03:51 -0600; Steve, I will have an hp 8753D ANA (automatic network analyzer) connected to a big Pi network within a week. As part of the amplifier I am building. I have two vacuum variables and a multronics coil; /archives//html/Amps/1998-04/msg00228.html (9,110 bytes)
296. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 24 Apr 1998 15:04:29 -0600; I am very close to making a swept frequency measurement of a large Pi network, for a tetrode amplifier. The two vacuum variables are mounted vertically, by coincidence, because it makes for short pat; /archives//html/Amps/1998-04/msg00265.html (8,615 bytes)
297. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Wed, 29 Apr 1998 10:34:36 -0600; Soeren, OZ1FTU, made this observation: I don't want to poo-poo parasitics, but there are some fundamental engineering points that you should be sure of before coming to that conclusion: Be careful ab; /archives//html/Amps/1998-04/msg00330.html (9,889 bytes)
298. [AMPS] one more point (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Wed, 29 Apr 1998 10:39:15 -0600; Soeren, OZ1FTU, made this observation: I forgot to add the point that the probe used (a wire) definitely has a frequency response, probably capacitive, so it has a rising sensitivity with frequency.; /archives//html/Amps/1998-04/msg00331.html (7,627 bytes)
299. [AMPS] class E (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Wed, 29 Apr 1998 17:47:44 -0600; RF Design magazine had an article on a class E amp for around 10 MHz, single freq, years ago. See below. QST published one recently I believe. Used to be you had to get a license from Nat Sokal and D; /archives//html/Amps/1998-04/msg00335.html (9,668 bytes)
300. [AMPS] Emission from Thoria Filaments (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 30 Apr 1998 13:20:58 -0600; I witnessed the recarb process on a big tube recently. It was essentially as AG6K described it. The gas used and the exact technique are sort of proprietary for each company but it was certainly an a; /archives//html/Amps/1998-04/msg00353.html (7,787 bytes)

Current List: 281 - 300
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]