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61. [AMPS] silver plating (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 3 Sep 1997 22:49:39 +0000; My HP Impedance Analyzer is supposedly good to a fraction of a percent, but let me put this in perspective. Putting my hand within two feet of the coil changes the Q more than the plating did. 73, T; /archives//html/Amps/1997-09/msg00068.html (9,040 bytes)
62. [AMPS] Conjugate match (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 4 Sep 1997 00:38:19 +0000; Rather than re-write a seven page paper again here, I'll e-mail anyone interested a copy of the paper on conjugate match coauthored by Belrose, Maxwell, and myself. It is scheduled to appear in Commu; /archives//html/Amps/1997-09/msg00070.html (8,589 bytes)
63. [AMPS] 8877 Parasitic Suppression Requirements (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 4 Sep 1997 00:38:19 +0000; Hi Rod, The most important thing you can do to insure stability is to use a very low impedance grid lead, and be sure the anode does not resonate on the same frequency where the grid has a high impe; /archives//html/Amps/1997-09/msg00071.html (11,660 bytes)
64. [AMPS] Conjugate match (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 4 Sep 1997 00:38:19 +0000; Hi Ian. It certainly does exist, and it can be measured with simple equipment. Viewed from the output terminals, over 15 PA's tested all produced maximum power and efficiency for a given amout of dri; /archives//html/Amps/1997-09/msg00072.html (9,180 bytes)
65. [AMPS] Silver plating (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 4 Sep 1997 07:36:23 +0000; To: <amps@contesting.com> Hi Bill, I'm making a new 80 meter loading coil for my mobile out of #8 tinned wire, so I'll record the Q and let the thing sit outside for a month. I'll re-measure the Q.; /archives//html/Amps/1997-09/msg00078.html (8,599 bytes)
66. [AMPS] 8875 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 4 Sep 1997 08:33:22 +0000; Any failure that can't be explained as one absolute cause is ALWAYS a parasitic. Come to think of it EVERY failure must be from a parasitic, because the Chinese use crappy glass in 3-500's, and when; /archives//html/Amps/1997-09/msg00079.html (7,888 bytes)
67. [AMPS] Re: Conjugate match (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 4 Sep 1997 08:33:21 +0000; To: <amps@contesting.com> I thought so. That parameter is NOT what we measure looking back into the PA. It would be like matching the resistance change of a tube or voltage in a power source by hold; /archives//html/Amps/1997-09/msg00080.html (9,526 bytes)
68. [AMPS] RE:conjugate match (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 5 Sep 1997 00:46:33 +0000; Yes, look at the silly thread about common mode current in the antenna group! When dealing with terms there is. It's certainly important to ask what the other guy means, just to be sure. So when I s; /archives//html/Amps/1997-09/msg00090.html (9,222 bytes)
69. [AMPS] Non Inductive Resistors (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 5 Sep 1997 23:18:04 +0000; The resistors you sell have a spiral winding of metal film inside, as do all MOF and carbon film types. 100nH in a 50 ohm load resistor, a type common to dummy loads, would produce an SWR of 1.4 to; /archives//html/Amps/1997-09/msg00101.html (8,905 bytes)
70. [AMPS] SB-220 problem (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 6 Sep 1997 00:44:51 +0000; Nonsense Carl. The last thing you want, if the tube faults, is to have the grid fly up to 3000 volts. If the grid, because of series resistance, reaches anode voltage levels during a fault... the ne; /archives//html/Amps/1997-09/msg00106.html (9,220 bytes)
71. [AMPS] SB-220 problem (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 6 Sep 1997 00:44:52 +0000; Hi Ken, Where is the resistor located exactly? It should be between the supply line and the plate choke's cold end. Did the resistor pop before you did that? Maybe you aren't loading the amp heavy en; /archives//html/Amps/1997-09/msg00107.html (9,749 bytes)
72. [AMPS] CENTURION HELP (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 6 Sep 1997 00:44:51 +0000; I measured the seal temperature on a friend's unit, and the seals exceeded Eimac's ratings with the PA idling!! I added more cooling and more bias. Can anyone think of a reason to have a tube idle h; /archives//html/Amps/1997-09/msg00108.html (8,262 bytes)
73. [AMPS] Linear with 4CX800A (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 6 Sep 1997 09:39:53 +0000; "Power on a Budget" by W6FR was a very good article, but I'd suggest a few changes. First, the auto bias circuit has a slow rise time because the 1 mFd capacitor at D1's cathode has to charge throug; /archives//html/Amps/1997-09/msg00113.html (10,764 bytes)
74. [AMPS] SB-220 continued (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 6 Sep 1997 10:37:13 +0000; Pete, if you have a small one ohm resistor in series with an anode lead in the path of RF, GET RID OF IT. The circulating currents on ten meters will kill the resistor! Perhaps you just stuck the re; /archives//html/Amps/1997-09/msg00115.html (11,519 bytes)
75. [AMPS] SB-220 problem (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 6 Sep 1997 10:37:12 +0000; Carl replied: You are entitled to your opinions, but experience has shown otherwise. Carl, think before you assume something needs to "arc". 1.) The cathode is emitting electrons, the grid is suddenl; /archives//html/Amps/1997-09/msg00116.html (11,581 bytes)
76. [AMPS] two questions and a self-contradiction (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 7 Sep 1997 11:30:08 +0000; To: <amps@contesting.com> Hmmmm. So it's OK to float the grids via some fusible resistance, but you still worry about 5 kV on the filament winding? Maybe if you grounded the grids, the filament woul; /archives//html/Amps/1997-09/msg00141.html (8,560 bytes)
77. [AMPS] two questions, TWO problems (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 7 Sep 1997 11:30:09 +0000; To: <amps@contesting.com> But be careful! The LAST thing you want at turn on is a stiff voltage regulated supply! It would be inrush city for the filament. Also, many supplies have fold-back current; /archives//html/Amps/1997-09/msg00142.html (9,236 bytes)
78. [AMPS] Voltage limiting of caps (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 7 Sep 1997 11:30:09 +0000; To: <amps@contesting.com> People must waste a lot of time with surge protectors and clamping diodes Rich. According to your "logical deduction", all they need is a 120 volt rated line bypass cap and; /archives//html/Amps/1997-09/msg00143.html (7,835 bytes)
79. [AMPS] SB-220 continued (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 7 Sep 1997 11:30:09 +0000; << The useless sine wave calculations is a circuit carrying harmonics deleted>> Except for some strange reason the very resistors that Rich calculates to be perfectly fine commonly fail! Rich is my; /archives//html/Amps/1997-09/msg00144.html (8,700 bytes)
80. [AMPS] SB-220 problem (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 7 Sep 1997 11:30:09 +0000; To: <amps@contesting.com> Hi Carl, The SB-220 DESIGN specs are as I indicated. Look them up. I wasn't aware National Radio serviced SB-220's, and sold and serviced 3-500 amps. How many ground grid a; /archives//html/Amps/1997-09/msg00145.html (11,403 bytes)

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