Mail Archive Search: <+from:stevek@jmr.com>

Results:

References: [ +from:stevek@jmr.com: 650 ]

Total 650 documents matching your query.

221. [AMPS] New to list. (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 15 Jan 2002 13:49:33 -0800; Hi Ron, see below.... [Steve Katz] Absolutely. You can't tell what's happening with even a vague degree of accuracy when you don't have a direct connection. You're dealing with the vagaries of signal; /archives//html/Amps/2002-01/msg00107.html (11,102 bytes)
222. [AMPS] New to the Amps list (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 22 Jan 2002 09:05:06 -0800; [Steve Katz] (WB2WIK/6): No, it's not. [Steve Katz] (WB2WIK/6): No, the AL811 does not have an unused tube socket. The AL811 and 811H do not use 572B's, they use 811A's. Only the AL-572 uses 572B's.; /archives//html/Amps/2002-01/msg00168.html (10,551 bytes)
223. [AMPS] Gonset... (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 23 Jan 2002 07:41:10 -0800; -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com; /archives//html/Amps/2002-01/msg00184.html (8,289 bytes)
224. [AMPS] Special connector for coax?? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 28 Jan 2002 09:00:54 -0800; The discussion about HV connectors involved DC power supply fittings, not RF transmission. RG8/U and PL-259's handle lots of power unless horribly mismatched. Actually, I've tested PL-259's at 10 amp; /archives//html/Amps/2002-01/msg00228.html (11,786 bytes)
225. [AMPS] found connectors but now : cable ? (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 29 Jan 2002 07:58:40 -0800; I like spark plug wire, also, and have used it for HT cabling for years...it's so well insulated that it will probably work under water. "Test prod wire," some of which is available with 10kV insulat; /archives//html/Amps/2002-01/msg00267.html (10,423 bytes)
226. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 29 Jan 2002 09:45:18 -0800; <snip> <snip> first-class, in Zeners? Having fabricated a lot of these (starting with undoped silicon), the "fallout" in manufacturing is usually -- oops! missed the target avalanche voltage! -- or; /archives//html/Amps/2002-01/msg00273.html (10,775 bytes)
227. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 29 Jan 2002 14:02:27 -0800; (write), is a function of only three variables: Avalanche voltage; junction construction; junction cross-section (die area). If one desires low Zz (dynamic impedance), it's easy to find in very larg; /archives//html/Amps/2002-01/msg00282.html (11,205 bytes)
228. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 29 Jan 2002 14:46:52 -0800; however, if you do the math, it comes out the same. The problem is that Zz, and thus regulation, is not held well by small-area junctions. The Zz of a small device might be 10-20-30 Ohms, so dynamic; /archives//html/Amps/2002-01/msg00287.html (12,402 bytes)
229. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 30 Jan 2002 10:00:58 -0800; There's been so much discussion on this, I can't resist: Last time I built a tetrode amp I used a 4-1000A grid-driven and put +550V on Ig2, provided by a stiff power supply that had no electronic reg; /archives//html/Amps/2002-01/msg00320.html (14,692 bytes)
230. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 30 Jan 2002 11:09:03 -0800; other tetrode amps (homebrew projects) have been 4CX250B and 4CX1000A types, used the same approach with those. Screen current goes positive, negative, whatever -- mostly averaging "zero," and adjus; /archives//html/Amps/2002-01/msg00325.html (12,169 bytes)
231. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 30 Jan 2002 11:48:48 -0800; However, in 25 years, this problem has never occurred. The screen, plate, grid and filament supplies are all on the same chassis, through the same power cord, using the same circuit breaker, so will; /archives//html/Amps/2002-01/msg00330.html (9,687 bytes)
232. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 30 Jan 2002 13:19:53 -0800; Wait a minute. You mean, SWR grease is now commercially available? Damn. I always have to brew my own. I start with boiling a chicken.... WB2WIK/6 -- FAQ on WWW: http://www.contesting.com/FAQ/amps S; /archives//html/Amps/2002-01/msg00336.html (9,635 bytes)
233. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 30 Jan 2002 13:46:06 -0800; I still sell my "SWR reducing kits" for the freebanding crowd...1000' spool of RG58/U, connectors on both ends, installed between the SWR meter and the antenna feedline and guaranteed to provide 2:1; /archives//html/Amps/2002-01/msg00341.html (10,095 bytes)
234. [AMPS] Porcelain Standoffs (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 31 Jan 2002 08:14:24 -0800; Are these in the RF section or the DC power supply? Sounds like you mean the RF section... No matter how good the material is, many such standoffs actually have very little space inside to separate t; /archives//html/Amps/2002-01/msg00373.html (8,655 bytes)
235. [AMPS] Alpha 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 3 Dec 2001 07:52:45 -0800; We use that combo among others at my contest station, K2XR (1000MP/374A) and there's nothing to do to set it up except attach the coax from the rig to the amplifier... The 374A has untuned input and; /archives//html/Amps/2001-12/msg00025.html (8,709 bytes)
236. [AMPS] Alpha 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 3 Dec 2001 10:09:37 -0800; Hi Rich, What's an "outout" control? The 1000MP has an output level control indeed. But I never trust just turning down the output level to prevent overdrive of 8874's, they pop way too easily...whic; /archives//html/Amps/2001-12/msg00031.html (8,511 bytes)
237. [AMPS] Alpha 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 3 Dec 2001 13:37:11 -0800; [Steve Katz] Well, whatever! I only know the cost of 8874's currently sucks and it doesn't seem to be decreasing, so short of replacing them with something else (a serious possibility), I try to tak; /archives//html/Amps/2001-12/msg00040.html (9,506 bytes)
238. [AMPS] AL1500 (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 3 Dec 2001 13:42:46 -0800; Is that a French ham or a Function key? <yuck> [Steve Katz] The AL1500 runs a lot of power. Not so much for people using "tetrodes with handles," but more than the amateur legal limit, for sure. Had; /archives//html/Amps/2001-12/msg00042.html (8,516 bytes)
239. [AMPS] Alpha 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 3 Dec 2001 15:32:48 -0800; [Steve Katz] What about A3j? Peak Ip can seemingly exceed this. Is there a time constant for the kind of damage you describe? We have one old 3-hole 374 which hits >1Apk Ip all the time and has used; /archives//html/Amps/2001-12/msg00045.html (7,852 bytes)
240. [AMPS] a question for the EXPERT (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 3 Dec 2001 16:06:09 -0800; Assuming you mean a vacuum tube amp, on 50 MHz I usually use a pi-net with a small vacuum variable for plate tuning (2-30 pF, 10kV), 1/4" copper tubing for the inductor (typ 3t, about 1.5" inside dia; /archives//html/Amps/2001-12/msg00047.html (9,168 bytes)

Current List: 221 - 240
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]