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41. [Amps] Pi tanks vs Pi L + LOW PASS (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 28 Jun 2002 19:14:12 -0400; I wonder if you could enlighten the group on this Alex. First, could you tell us how shielding the tank circuit improves IMD...since they are totally unrelated. Second, could you tell us what FCC ru; /archives//html/Amps/2002-06/msg00257.html (8,481 bytes)
42. [Amps] Pi tanks vs Pi L + LOW PASS (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 28 Jun 2002 19:41:16 -0400; That also is an interesting comment. Does anyone know how phase jitter causes harmonics? I've never seen that, it must be one hell of a jitter.73, Tom W8JI W8JI@contesting.com; /archives//html/Amps/2002-06/msg00259.html (8,241 bytes)
43. [Amps] Pi tanks vs Pi L + LOW PASS (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 29 Jun 2002 08:46:51 -0400; Well, at least it is better than conjugately matching a power supply to the power line. 73, Tom W8JI W8JI@contesting.com; /archives//html/Amps/2002-06/msg00267.html (7,908 bytes)
44. [Amps] choke resonances (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 30 Jun 2002 14:41:00 -0400; Hi Phil, More properly, we should say "the Ameritron RF choke sold by RF parts is used by many others". 73, Tom W8JI W8JI@contesting.com; /archives//html/Amps/2002-06/msg00284.html (8,021 bytes)
45. [Amps] Rectifier diode strings (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 5 May 2002 21:39:16 -0400; Most HV transformers, if well designed, saturate at about 1.3 or 1.4 times the normal peak voltage. Very few of them have good high frequency response. This is quite different than audio transformer; /archives//html/Amps/2002-05/msg00042.html (10,752 bytes)
46. [Amps] Transformer rewinding (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 6 May 2002 06:38:14 -0400; Regulation in that transformer will be terrible especially if you draw anything over a few hundred mA. ESR is far too high for a capacitor input supply. You need to rewind all the windings, or find; /archives//html/Amps/2002-05/msg00046.html (8,670 bytes)
47. [Amps] Rectifier diode strings (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 6 May 2002 14:12:15 -0400; Yes, saturation applies. Remember what it is. The core can only obtain a certain flux density, and that flux density relates only to the volt-turn of the magnetizing winding. Flux density is the sam; /archives//html/Amps/2002-05/msg00053.html (14,169 bytes)
48. [Amps] Ameritron AL82 @ 17 meters (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 10 May 2002 19:34:07 -0400; Ameritron triess to park resonances at 12MHz and 27 MHz. The problem is the exact frequency varies with stray capacitance from sheet metal around the choke, the choke materials, and the winding tole; /archives//html/Amps/2002-05/msg00120.html (9,209 bytes)
49. [Amps] power combining? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 12 May 2002 22:23:59 -0400; You'd better consider phase and gain errors in the amplifiers, especially if the amplifiers have filters in each PA and you combining after the amplifiers (or driving separate antennas). You also ha; /archives//html/Amps/2002-05/msg00147.html (7,451 bytes)
50. [Amps] Ameritron AL82 @ 17 meters (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 13 May 2002 09:01:03 -0400; One connection goes directly through the T to the load. The T is ground directly to the chassis as close to the top of the choke as possible. A small low current bulb with wire leads connects betwee; /archives//html/Amps/2002-05/msg00163.html (10,240 bytes)
51. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 14 May 2002 06:41:56 -0400; What do you have plugged into the receive antenna jack on the MP, anything? I've had problems with transceivers oscillating when using separate receive antennas because of poor external antenna port; /archives//html/Amps/2002-05/msg00192.html (9,492 bytes)
52. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 15 May 2002 22:10:35 -0400; It is virtually impossible to have an HF oscillation problem in a GG amplifier with a very stable tube like the 8877. You also indicated it was level sensitive with a fairly high power threshold, wh; /archives//html/Amps/2002-05/msg00231.html (11,241 bytes)
53. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 16 May 2002 10:19:40 -0400; Poor connections can generate TVI and RFI, but pieces of wire (even resonant ones) do not unless they have a poor connection someplace. It takes an arc or an unintentional rectifier to cause TVI.73,; /archives//html/Amps/2002-05/msg00240.html (9,733 bytes)
54. [Amps] Nonsense (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 16 May 2002 22:50:20 -0400; I would also. In all my years in this business (over 30), I have never seen an analog frequency divider or a true "sub-harmonic". Every single case of "sub-harmonics" I have seen come from a VFO lea; /archives//html/Amps/2002-05/msg00261.html (7,796 bytes)
55. [Amps] Nonsense (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 17 May 2002 06:17:26 -0400; Are you sure about that Steve? How often do you see it?73, Tom W8JI W8JI@contesting.com; /archives//html/Amps/2002-05/msg00266.html (6,782 bytes)
56. [Amps] ameritron manual (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 17 May 2002 21:45:40 -0400; When you guys are asking for manuals, WHO are you asking?? What method (web page) or telephone number are you calling? Without taking the time to get a name or at least saying **how** you are orderin; /archives//html/Amps/2002-05/msg00283.html (7,628 bytes)
57. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 17 May 2002 21:45:40 -0400; Hi Dave, I'm positive you are wasting time looking for non-linear joints producing a F/2 or 3F/2 product. Sub-harmonics are impossible to produce by virtue of a non-linear system. . Look for a mixin; /archives//html/Amps/2002-05/msg00284.html (10,349 bytes)
58. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 18 May 2002 06:45:16 -0400; A possible clue would be to change frequencies and watch the spurious frequency change. Locks at half the frequency are nearly impossible, because the positive peak of the oscillating system would h; /archives//html/Amps/2002-05/msg00287.html (15,153 bytes)
59. [Amps] ameritron manual (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 18 May 2002 06:45:16 -0400; Only one person responded so far and he used the webpage to ask for a manual. What have the others done to ask for a manual? 73, Tom W8JI W8JI@contesting.com; /archives//html/Amps/2002-05/msg00288.html (7,798 bytes)
60. [Amps] Subharmonic (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 21 May 2002 18:05:09 -0400; Specially designed systems that have oscillators phase-locked to f/2 are not very common accidents Mike. They take a lot of effort to get working and special components. I'm not even sure they are p; /archives//html/Amps/2002-05/msg00338.html (8,323 bytes)

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