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321. [AMPS] 4-1000A Project (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 6 Apr 2001 07:48:02 -0400; That isn't correct. They are in series, but have different resistances loads across each one. A better way to look at this is two L networks back-to-back. Those values are off somewhat. Let's assume; /archives//html/Amps/2001-04/msg00134.html (10,283 bytes)
322. [AMPS] Problem with Ameritron AL-82 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 6 Apr 2001 07:48:02 -0400; Does the AL82 have one relay, or two relays in the antenna system? Does it do this on all bands? 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@c; /archives//html/Amps/2001-04/msg00135.html (7,261 bytes)
323. [AMPS] 4-1000A Project (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 6 Apr 2001 11:21:38 -0400; Woops, I should have been more clear. I was speaking of the capacitors at each end of the tank. The load capacitor is across the load resistance, so current in the capacitor is proportional to the v; /archives//html/Amps/2001-04/msg00144.html (10,864 bytes)
324. [AMPS] ALPHA 77SX on 50Hz (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 7 Apr 2001 11:05:45 -0400; Hi Bert, ZL3REX said he received your card on 160. He heard you fine in spite of your using 60 Hz power mains. We have taps and dies, and can correct most bolts. It is the nuts we have a problem with; /archives//html/Amps/2001-04/msg00156.html (9,884 bytes)
325. [AMPS] 230 /115 volts (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 7 Apr 2001 17:56:06 -0400; They are 240v, not 220 or 230. The standard is 240v, although some large occupied buildings use three-phase....which are then 120v/208v My house has a pair of 200 ampere mains, so I have a total of; /archives//html/Amps/2001-04/msg00171.html (8,661 bytes)
326. [AMPS] ALPHA 77SX on 50Hz (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 7 Apr 2001 18:19:13 -0400; That is correct, either for small or large transformers. You can use a transformer designed for 50 Hz on 60, but not always the other way unless the transformer has enough headroom in flux density.; /archives//html/Amps/2001-04/msg00172.html (10,098 bytes)
327. [AMPS] Re:230 /115 volts (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 8 Apr 2001 10:08:38 -0400; The distribution is single or multi phase. Homes are virtually all single phase. 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com A; /archives//html/Amps/2001-04/msg00181.html (7,584 bytes)
328. [AMPS] Re:230 /115 volts QUIZ. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 9 Apr 2001 10:31:43 -0400; Wild-leg three-phase is common, and the configuration can be a Wye or Delta. Where the configuration is a delta, one 240 v transformer secondary is connected the normal way. Each of the two hot phas; /archives//html/Amps/2001-04/msg00197.html (8,914 bytes)
329. [AMPS] Penta Labs Tubes (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 9 Apr 2001 13:59:03 -0400; I'm not sure. Is this the Penta Labs that glues the caps on the 3-500Z's because the set screws fall out....and that sold the 3-500Z's whose glass sucked in from normal operation? The Penta who's he; /archives//html/Amps/2001-04/msg00204.html (7,644 bytes)
330. [AMPS] Re: 230 /115 volts ???? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 9 Apr 2001 16:27:52 -0400; Hi Ted, Some large multiple dwellings or older densely populated areas have 208/120. The service is a three phase Y...using three 120 volt transformers. You get 120 from any legs to neutral/ground,; /archives//html/Amps/2001-04/msg00209.html (8,191 bytes)
331. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 10 Apr 2001 20:58:53 -0400; I wouldn't use that system. It has too low a grid drive, and that's really bad news for modern exciters. The screen supply has crummy regulation, and the transformer is over-taxed by the supply. The; /archives//html/Amps/2001-04/msg00240.html (9,339 bytes)
332. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 10 Apr 2001 20:58:53 -0400; That 's true. Why? There is no reason it should cause problems if you wrap around the zeners with few transistors. The series resistance of a string of zeners might be too large compared to the dyna; /archives//html/Amps/2001-04/msg00241.html (10,233 bytes)
333. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 11 Apr 2001 06:56:23 -0400; Regulation will be much better than 1% if you wrap around the zeners with a gain stage. The overall cost will be the same, since you can use cheap HV NPN or PNP transistors and smaller zeners. In th; /archives//html/Amps/2001-04/msg00246.html (10,477 bytes)
334. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Apr 2001 20:18:27 -0400; .....and you can win the lotto by buying only one ticket! Think about the problem a little bit. The screen has to rise to probably a thousand volts or more to give any transient protection time and; /archives//html/Amps/2001-04/msg00286.html (9,076 bytes)
335. [AMPS] Need help with Ameritron AL-80A (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Apr 2001 20:53:48 -0400; ' More likely the ground from the meter switch board is disconnected, or loose. It solders to a lug under the filter capacitors, right where he changed the diode. With that diode, it is impossible t; /archives//html/Amps/2001-04/msg00287.html (7,864 bytes)
336. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 13 Apr 2001 11:00:33 -0400; It would be identical to what you would do with a more complex regulator. I'd use a series diode string to the screen with a properly designed resistance across that diode string for reverse current; /archives//html/Amps/2001-04/msg00297.html (9,693 bytes)
337. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 13 Apr 2001 11:00:33 -0400; .....and all amplifiers need those kits according to who???? 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative reques; /archives//html/Amps/2001-04/msg00298.html (8,494 bytes)
338. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 13 Apr 2001 21:46:59 -0400; That's right, they don't clamp hard. The initial arc is also discharging capacitance beyond the current limiting resistor. VDR's are poor clamps, plus the initial transient can be very large compare; /archives//html/Amps/2001-04/msg00308.html (10,097 bytes)
339. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 13 Apr 2001 21:46:59 -0400; Rich is almost certainly talking about triodes and pentodes Ian, not tetrodes....where they are somewhat common. Anode to screen flashovers are rare in tetrodes and never happen in triodes. 73, Tom; /archives//html/Amps/2001-04/msg00309.html (9,317 bytes)
340. [AMPS] Flashovers (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 15 Apr 2001 05:36:40 -0400; Probably VHF parasitics caused by photons. 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@c; /archives//html/Amps/2001-04/msg00342.html (7,107 bytes)

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