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261. [AMPS] S/A for RF measurements (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 1 May 1998 10:13:12 -0600; I'm partial to Tektronix spectrum analyzers (sorry Hp folks) just because have used them for so long. But my coworkers use Hp, so we have mostly those at work. In my shack, however, I now have a 7L14; /archives//html/Amps/1998-05/msg00014.html (8,467 bytes)
262. [AMPS] S/A for RF measurements (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 1 May 1998 16:20:06 -0600; Yes, intermod can be generated in a nonlinear device coming through the "back door". Broadcast sites with many XMTR's co-located have to install notch and BP filters, to prevent the neighboring RF f; /archives//html/Amps/1998-05/msg00017.html (10,618 bytes)
263. [AMPS] S/A for RF measurements (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Tue, 5 May 1998 09:07:21 -0600; That's interesting, using ferrite beads on guy wires. Do they rust outside? John K5PRO -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: a; /archives//html/Amps/1998-05/msg00046.html (7,344 bytes)
264. [AMPS] hi pot warning (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 8 May 1998 13:13:14 -0600; Hi, Not to enter the parasitic discussion, I just wanted to pass on the advice I got from both Econco and CPI/Eimac over the years. When high potting the grid/filament of big tubes, especially those; /archives//html/Amps/1998-05/msg00108.html (8,078 bytes)
265. [AMPS] Gases liberated in plate (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 11 May 1998 11:00:06 -0600; Following is a simple and valid explanation of gas in vacuum power tubes. It came from "The Application of Graphite as an Anode Material to High Vacuum Transmitting Tubes", by EE Spitzer of General E; /archives//html/Amps/1998-05/msg00156.html (8,905 bytes)
266. [AMPS] INFO WANTED ON 4651 TUBE (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 11 May 1998 17:31:11 -0600; OK, here is all I could find, in the general BURLE catalog. You could contact Brian Greene or Robert Rutherford at the factory in Lancaster, PA. He will give you more info, like a data sheet. (717) 2; /archives//html/Amps/1998-05/msg00163.html (7,686 bytes)
267. [AMPS] INFO wtd: QRO DUMMY LOAD (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Wed, 13 May 1998 21:58:03 -0600; Sir: I hope you get this before leaving, if you need to know. The Electro Impulse load is probably similar to what they now call a CLW-253. I say this only because the numbering is similar and the pi; /archives//html/Amps/1998-05/msg00217.html (7,766 bytes)
268. [AMPS] filament decoupling for RF (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Wed, 13 May 1998 22:32:03 -0600; In a grid-driven amplifier, using tetrodes, one bypasses the filament leads for RF, to ground. It is printed in every book I've seen. Some even go into more detail, like the Philips RF Heating book b; /archives//html/Amps/1998-05/msg00219.html (12,269 bytes)
269. No subject (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 14 May 1998 10:21:46 -0600; Counterpoint to the following comments - sorry now I got too interested. I realize that some of W7IUV's statements are jest, but.... A couple of years ago, at VOA transmitter site in Sri Lanka, a bra; /archives//html/Amps/1998-05/msg00232.html (12,839 bytes)
270. [AMPS] Resonances (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 14 May 1998 19:10:21 -0600; Steve Thompson sez: Are you using the smith chart or what? and is it calibrated (open, short, load) before all this. Otherwise all bets are off. The short circuit appears to be series resonance. When; /archives//html/Amps/1998-05/msg00241.html (9,409 bytes)
271. [AMPS] tubes that go pop (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 21 May 1998 18:48:59 -0600; Here's a topic, based on the melt-thru discussion (nothing about parasites here). Maybe some of you have witnessed similar "oops!".... I've been through some interesting tube failures in my life wort; /archives//html/Amps/1998-05/msg00447.html (11,390 bytes)
272. [AMPS] bent filament calculation (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Thu, 21 May 1998 20:00:29 -0600; I went back to the 1941 paper by Heyboer of Philips, titled "A Discharge Phenomenon in Large Transmitter Valves". The abstract (part of it): "In transmitter valves a flashover sometimes occurs betwee; /archives//html/Amps/1998-05/msg00454.html (12,351 bytes)
273. [AMPS] ponder this (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 22 May 1998 17:18:14 -0600; Yes, Pondermotive probably went away a long time ago, maybe similar to electromotive? It came from the European pub, Philips Technical Review, Vol.6, No.7, page 208-214, dated July, 1941. The author; /archives//html/Amps/1998-05/msg00494.html (7,011 bytes)
274. [AMPS] Excess hfe and ft (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 22 May 1998 17:35:48 -0600; Hi, Jon (KE9NA) is correct: These are really taking the place in new RF power designs for UHF, that used to be bipolar. We designed an amplifier 2 years ago using the MRF 899, a bipolar for 150 W PEP; /archives//html/Amps/1998-05/msg00495.html (8,059 bytes)
275. [AMPS] new transistors for UHF power (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 22 May 1998 19:16:16 -0600; In my post earlier about the LDMOS transistors, it came garbled. Sorry, here is a better explanation: These are really taking the place in new RF power designs for UHF, that used to be all bipolar. Y; /archives//html/Amps/1998-05/msg00504.html (9,630 bytes)
276. [AMPS] tubes that go pop (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Fri, 22 May 1998 19:21:31 -0600; Unfortunately, my little booklet TUBE TOPICS disappeared. However, I remember it was mostly a bunch of commonsense things for broadcasters like: Clean the air filter regularly Occasionally remove th; /archives//html/Amps/1998-05/msg00506.html (7,327 bytes)
277. [AMPS] new transistors for UHF power (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sat, 23 May 1998 20:36:10 -0600; UHF television band Harris Broadcast has a web site that shows the LDMOS and Silicon Carbide XMTRs. http://www.broadcast.harris.com/ Then go to TV RF page, and then to the DIAMOND CD SERIES UHF SOLI; /archives//html/Amps/1998-05/msg00530.html (7,743 bytes)
278. [AMPS] Air Sealing of RF chamber (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sat, 23 May 1998 20:51:53 -0600; Ian (G3SEK) asked: HEY, I don't use big blowers! I use water cooling. The blower on the filament and seals on the thing I'm working on is only a Rotron, one of their little regenerative blowers, like; /archives//html/Amps/1998-05/msg00531.html (9,028 bytes)
279. [AMPS] Air Sealing of RF chamber (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Sun, 24 May 1998 16:19:27 -0600; Art, I was talking about tubes which cost a bit much for amateurs, but once could sell the shack and all and buy one. Starting price might is $25,000, up to $130,000 US dollars, per tube. Seriously t; /archives//html/Amps/1998-05/msg00551.html (8,081 bytes)
280. [AMPS] big amps/low parasites (score: 1): Author: jtml@lanl.gov (John Lyles); Date: Mon, 25 May 1998 13:17:41 -0700; Hello, I'm home today, the first time in a few weekends (it's also Memorial Day, a gov't holiday). Thought I'd share a few experiences about the 200 KW push-pull amp that is about to be turned on. We; /archives//html/Amps/1998-05/msg00566.html (12,738 bytes)

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