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Total 95 documents matching your query.

61. Re: [Amps] SB-220 (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 3 Nov 2004 13:28:13 -0800; On Nov 3, 2004, at 10:50 AM, Pete Smith wrote: Will, that was absolutely NOT what I was saying. Of course, parasitics do happen, and amplifier designers do install parasitic suppression if their desi; /archives//html/Amps/2004-11/msg00046.html (15,997 bytes)
62. Re: [Amps] SB-220 (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 3 Nov 2004 13:54:34 -0800; On Nov 3, 2004, at 10:58 AM, Will Matney wrote: Steve, That's the way I always looked at it too. But, and here's a big but, I read a few webpages that says VHF oscillations are a bunch of bologna. Th; /archives//html/Amps/2004-11/msg00047.html (12,846 bytes)
63. Re: [Amps] SB-220 (score: 1): Author: Dennis12Amplify@aol.com; Date: Wed, 3 Nov 2004 21:29:50 EST; The mechanism that allows a parasitic oscillation in a pair of 3-500Zs is the 0.3pF of C between the anodes and the cathodes. 0.3pF seems pretty trivial until one discovers that it amounts to a feedb; /archives//html/Amps/2004-11/msg00053.html (7,685 bytes)
64. Re: [Amps] SB-220 (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Thu, 04 Nov 2004 09:39:24 -0800; _________________________________________________________ One other factor not mentioned is the Q of the VHF circuit, which has a great effect on gain. If the VHF Q is very high, oscillations are alm; /archives//html/Amps/2004-11/msg00074.html (9,328 bytes)
65. Re: [Amps] SB-220 (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 4 Nov 2004 11:35:42 -0800; On Nov 4, 2004, at 9:39 AM, Bill Turner wrote: On Wed, 03 Nov 2004 13:58:51 -0500, Will Matney wrote: Now to me, if the lead(s) length is correct, and the gain high enough, the internal capacitance o; /archives//html/Amps/2004-11/msg00079.html (10,316 bytes)
66. Re: [Amps] SB-220 (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Thu, 4 Nov 2004 20:05:20 -0500; Using "toaster wire" is a sure way to drive down that VHF-Q! (It's not a bolt-on deal, however) hal _______________________________________________ Amps mailing list Amps@contesting.com http://lists.; /archives//html/Amps/2004-11/msg00090.html (7,800 bytes)
67. [Amps] SB-220 (score: 1): Author: "Larry Stowell" <lclarks@nc.rr.com>; Date: Mon, 27 Dec 2004 05:33:34 -0500; I have a SB-220 and am wondering if it is better to turn it off when its not going to be used for a couple of hours? I turn my radio's on early morning and leave them on most of the day. Larry K1ZW D; /archives//html/Amps/2004-12/msg00351.html (6,182 bytes)
68. Re: [Amps] SB-220 (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 27 Dec 2004 06:48:08 -0800; On Dec 27, 2004, at 2:33 AM, Larry Stowell wrote: I have a SB-220 and am wondering if it is better to turn it off when its not going to be used for a couple of hours? I turn my radio's on early morni; /archives//html/Amps/2004-12/msg00354.html (7,755 bytes)
69. Re: [Amps] SB-220 (score: 1): Author: "Dan" <dpipes@earthlink.net>; Date: Mon, 27 Dec 2004 07:53:02 -0700; Richard & others... How does the Ameritron 811H fit into this same questions thanks Dan == _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contestin; /archives//html/Amps/2004-12/msg00355.html (7,603 bytes)
70. Re: [Amps] SB-220 (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 27 Dec 2004 07:05:29 -0800; Dan -- I have never measured the fil V in an AL-811. The only RF-Tx amplifiers that do not benefit from a step-start are those that already have one. The Henry 3K-A is one example. On Dec 27, 2004, a; /archives//html/Amps/2004-12/msg00356.html (9,018 bytes)
71. Re[2]: [Amps] SB-220 (score: 1): Author: "Dan" <dpipes@earthlink.net>; Date: Mon, 27 Dec 2004 08:16:02 -0700; Richard, I would think the inrush protection as on your site would no doubt be good regardless just to calm everything down a little when the amp is switched on.. Even though the 811H HV is at 1700 v; /archives//html/Amps/2004-12/msg00357.html (10,373 bytes)
72. Re: [Amps] SB-220 (score: 1): Author: G3rzp@aol.com; Date: Mon, 27 Dec 2004 11:01:51 EST; The only RF-Tx amplifiers that do not benefit from a step-start are those that already have one. To my mind, anything over the 100 watt level can benefit - and quite possibly, stuff under that too, i; /archives//html/Amps/2004-12/msg00359.html (7,872 bytes)
73. Re: [Amps] SB-220 (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Mon, 27 Dec 2004 11:17:17 -0500; Dear Larry, Commercial broadcasters leave their transmitters on 24/7. The most intense time for your amplifier is when it's turned on from room temperature. By the time it has warmed up a couple of h; /archives//html/Amps/2004-12/msg00360.html (8,118 bytes)
74. Re: [Amps] SB-220 (score: 1): Author: Colin Lamb <k7fm@teleport.com>; Date: Mon, 27 Dec 2004 08:32:52 -0800 (GMT-08:00); Hopefully it is in the standby position rather than on. K7FM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2004-12/msg00361.html (7,936 bytes)
75. Re: [Amps] SB-220 (score: 1): Author: Joe Isabella <n3ji@yahoo.com>; Date: Mon, 27 Dec 2004 09:16:52 -0800 (PST); Yep -- it's a good design, too. It has a four-position rotary type main switch that is arranged so you can't get to the 3000/4000V position without first going through the position that has a *BIG* r; /archives//html/Amps/2004-12/msg00364.html (8,404 bytes)
76. [Amps] SB-220 (score: 1): Author: "Larry stowell" <lclarks@nc.rr.com>; Date: Tue, 18 Dec 2007 10:43:51 -0500; I'm redoing my SB-221, I put in a Harbach capacitor kit and want to replace the high voltage wire and am wondering a source for this wirer? Its say its blue in the manual but mines red I really don't; /archives//html/Amps/2007-12/msg00177.html (6,734 bytes)
77. [Amps] SB-220 (score: 1): Author: "Jeff Carter" <amps@hidden-valley.com>; Date: Thu, 27 Mar 2008 17:50:58 -0400; Hi all, As an experiment and educational opportunity, I am preparing to rebuild two SB-220s that I just bought for the purpose. I intend to go all the way to the metal and start over, just like I was; /archives//html/Amps/2008-03/msg00296.html (7,298 bytes)
78. Re: [Amps] SB-220 (score: 1): Author: Rick Stealey <rstealey@hotmail.com>; Date: Fri, 28 Mar 2008 00:14:39 +0000; ?????????????? The SB-220 is a stable, well behaved amplifier. Self oscillation? Read QST Sept. 1994 page 71 before you do anything. Oh, there are things you might want to do, but be sure you read t; /archives//html/Amps/2008-03/msg00297.html (7,055 bytes)
79. Re: [Amps] SB-220 (score: 1): Author: "Jeff Carter" <amps@hidden-valley.com>; Date: Thu, 27 Mar 2008 21:10:56 -0400; Hi Rick, Could you give me the name of the article? My QST collection only goes back to 1999, but ARRL may have archived the article or I may be able to find it elsewhere if I could get the name. I w; /archives//html/Amps/2008-03/msg00298.html (8,068 bytes)
80. [Amps] SB-220 (score: 1): Author: "Jeff Carter" <amps@hidden-valley.com>; Date: Thu, 4 Sep 2008 18:11:14 -0400; Okay, one more time and I'll shut up. I know at least two of you work on amps and you have to have a huge broken parts bin. I have been able through the grace of the Amateur Radio community to come u; /archives//html/Amps/2008-09/msg00016.html (7,136 bytes)

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