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61. [Amps] AL-80B questions (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 07:20:23 2003; The capacitors have about .5 ohms or more each ESR, so that is about 4 ohms or more. The choke has 2+ ohms, and the rest of the circuit wiring adds another ohm or so. You'd need to add at least 10 o; /archives//html/Amps/2003-03/msg00360.html (10,622 bytes)
62. [Amps] AL-80B questions (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 11:45:16 2003; a other since. You: 1.) Replaced the swicth with a new switch 2.) Replaced a shorted 3-500Z with a good new tube. Now you don't have a problem, and the amplifier works. Why am I not surprised? amp.; /archives//html/Amps/2003-03/msg00372.html (10,300 bytes)
63. [Amps] AL-80B questions (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 11:53:54 2003; Lower VHF amplification tubes, or tubes not rated for VHF service, are actually the most unstable tubes when used in HF PA's. This is explained at: http://www.w8ji.com/vhf_stability.htm 73 Tom; /archives//html/Amps/2003-03/msg00373.html (8,775 bytes)
64. [Amps] Nichrome magic (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 12:05:21 2003; No many how many times you repeat that story, it does not become real Rich. The only stability problem I am or ever have been aware of in a SB220 is the same one that occurs in other amps using that; /archives//html/Amps/2003-03/msg00376.html (7,197 bytes)
65. [Amps] SB-220 cap arc and the local broadcast station (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 15:55:35 2003; You can not clean and polish a capacitor and restore voltage. Although the article mostly was written for gamma matching, I give sme details why in my gamma and omega matching page. Capacitors are m; /archives//html/Amps/2003-03/msg00394.html (8,296 bytes)
66. [Amps] SB-220 cap arc and the local broadcast station (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 15:58:09 2003; first-class. I took a shot at servicing Heath gear as a subcontractor back around 1970. It was a disaster because of the poor construction and wiring errors. You would not believe how bad some of th; /archives//html/Amps/2003-03/msg00395.html (7,388 bytes)
67. [Amps] AL-80B questions (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 16:26:21 2003; You can hurt VHF stability Joe. The Measures suppressors I have measured actually increase VHF Q. What Rich overlooks is his suppressors with lower Rp are in SERIES with a long system. In that case,; /archives//html/Amps/2003-03/msg00397.html (11,991 bytes)
68. [Amps] Clipperton Bandswitch wafer (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 19:04:56 2003; Monty, The AL80B bandswitch wafers will fit, and are actually higher voltage replacements for the Clipperton. You can get the ceramic sections down to only two sections by using AL80B wafers. Use a; /archives//html/Amps/2003-03/msg00400.html (6,944 bytes)
69. [Amps] Tuned Input (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 19:16:55 2003; maximum Best SWR. The input should be a low-pass CLC Pi-network, or have other shunt C at the output that provides a very low impedance at the harmonics of the drive frequency to the tube cathode. Ot; /archives//html/Amps/2003-03/msg00405.html (7,245 bytes)
70. [Amps] AL-80B questions (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Sun Mar 9 19:52:43 2003; Sorry Rich, that is not true. I don't expect you will answer this point by point, but it would be interesting if you could refrain from insults and smoke screens and try responding point by point. F; /archives//html/Amps/2003-03/msg00406.html (12,133 bytes)
71. [Amps] AL-80B questions (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Mon Mar 10 06:13:27 2003; Anyone who has tuned a tuning control on a transmitter understands reactance can affect gain. We took everything to a parallel mode, which is the parallel equivalent impedance of a two-terminal devi; /archives//html/Amps/2003-03/msg00416.html (10,925 bytes)
72. [Amps] AL-80B questions (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Mon Mar 10 14:22:38 2003; measurement. I don't have suppressors. Unlike you, I am not in the business of retailing anything and have no connection to any parts retailer. I'm sure Eric could get a replacement suppressor from; /archives//html/Amps/2003-03/msg00433.html (9,331 bytes)
73. [Amps] AL-80B questions (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Mon Mar 10 14:30:12 2003; That's correct. The lowest Rp suppressor is nothing at all. Q is limited by the external components. That's correct also. Optimum is NEVER lowest or highest, it is some value in between. See: http:/; /archives//html/Amps/2003-03/msg00435.html (9,262 bytes)
74. [Amps] SB-1000 Transformer & Problem (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Mon Mar 10 14:41:00 2003; When the SB1000 was produced, some changes were made from the original design. The original transformers were bought from Schumacher, and were better transformers. Later transformers had a tendency; /archives//html/Amps/2003-03/msg00436.html (7,651 bytes)
75. [Amps] AL-80B questions (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Tue Mar 11 14:48:46 2003; it to The above has been my point all along. What the suppressor is, all by itself on a table, has little to do with how well it works in an actual system. You have to know the system. Claiming lowe; /archives//html/Amps/2003-03/msg00451.html (9,366 bytes)
76. [Amps] Re: What would a meaningful test look like? (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Tue Mar 11 20:10:29 2003; I think everyone is worn out on this, and I know I certainly am. I wouldn't object to one more objective test session assuming it was scientific. I enjoy learning, and sharing knowledge, but I reall; /archives//html/Amps/2003-03/msg00460.html (11,406 bytes)
77. [Amps] Palomar (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Wed Mar 12 05:15:14 2003; That's interesting. The rumor I heard, and it was just second hand information like yours, is that they were both under the same basic propritorship, like Swan and Siltronics were. Does anyone know; /archives//html/Amps/2003-03/msg00465.html (7,001 bytes)
78. [Amps] Parasitic Oscillations in RF Amplifiers (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Wed Mar 12 05:33:39 2003; fixed I've found the same thing in testing, but the cause was original components. WB8BFS reported the same thing here with a TL922, Jack's had a relay sequencing problem. A K5 had a gas-tube lighti; /archives//html/Amps/2003-03/msg00466.html (9,571 bytes)
79. [Amps] Parasitic Oscillations in RF Amplifiers (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Wed Mar 12 17:54:35 2003; Making a measurement that is meaningless won't help much. A dip meter does not tell you impedance. It will dip where impedance is minimum, or maximum, depending on the system being tested. The only; /archives//html/Amps/2003-03/msg00484.html (7,693 bytes)
80. [Amps] Speaking of Palomar (score: 131): Author: w8ji at contesting.com (Tom Rauch); Date: Wed Mar 12 18:01:38 2003; absolutely be are Hi Nate, I'd be real careful about using such an amplifier. It certainly could not pass FCC requirements for harmonics and spurious, and it almost certainly splatters a great deal.; /archives//html/Amps/2003-03/msg00486.html (8,784 bytes)

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