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61. Re: [Amps] grid resonance (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 07 Aug 2006 12:05:03 -0700
Right. But I think we can agree that a half wave dipole looks like a series resonant circuit ALL BY ITSELF -- that is, the exchange of energy accomplished by the antenna closes the loop. The same is
/archives//html/Amps/2006-08/msg00266.html (8,905 bytes)

62. [Amps] Titan 425 Reflected Power (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 24 Sep 2006 14:02:30 -0700
I'm encountering a strange problem with my Titan. If I follow standard practice and achieve a 1:1 match with the exciter, then take the amp out of standby, the amp typically shows mismatch on the ord
/archives//html/Amps/2006-09/msg00292.html (8,810 bytes)

63. Re: [Amps] Titan 425 Reflected Power (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 24 Sep 2006 15:29:06 -0700
Wrong. My antennas are typically better than 2:1 over the bands they cover, except on 160 and 80/75 are >10% bandwidth, and I operate both CW and SSB -- in other words, that full bandwidth. If the an
/archives//html/Amps/2006-09/msg00296.html (9,082 bytes)

64. Re: [Amps] Titan 425 Reflected Power (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 25 Sep 2006 09:29:20 -0700
Thanks for all the ideas, both on and off list. I've got some work to do when I find some hours. One of the most interesting responses was this one from N7KA. The symptoms match mine exactly on both
/archives//html/Amps/2006-09/msg00310.html (10,196 bytes)

65. Re: [Amps] New Chinese linear Amplifier (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 30 Sep 2006 15:02:30 -0700
Yes. The company Behringer has earned a rotten reputation in the pro audio world because they have been caught red-handed copying the products of other manufacturers. They have, for example, copied s
/archives//html/Amps/2006-09/msg00384.html (9,906 bytes)

66. Re: [Amps] Is Amps still in existence? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 11 Oct 2006 22:53:19 -0700
Yes, it is a great improvement to be rid of the endless childishness. Jim Brown K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/
/archives//html/Amps/2006-10/msg00082.html (8,879 bytes)

67. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 12 Oct 2006 08:44:41 -0700
If your amplifier has a microprocessor, it shouldn't be too tough to sense the input frequency and cause the amp to shut down within the specified limits. And since it would be in firmware, it would
/archives//html/Amps/2006-10/msg00088.html (7,980 bytes)

68. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 15 Oct 2006 22:48:58 -0700
That is for UNPROCESSED speech (that is, no compression, peak limiting, AGC, or peak clipping, and little or no EQ). Dynamics processing and EQ can easily reduce that ratio to 3-6 dB. Stick a modulat
/archives//html/Amps/2006-10/msg00157.html (9,917 bytes)

69. Re: [Amps] What NOT to buy? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 23 Oct 2006 09:48:07 -0700
In the orphan category, the output devices for the original TenTec Hercules I (model 444) are unobtainium (Motorola found issues with them that they didn't want to solve, so they discontinued them),
/archives//html/Amps/2006-10/msg00245.html (7,883 bytes)

70. Re: [Amps] What NOT to buy? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 24 Oct 2006 09:45:47 -0700
No QSK is a biggie. Jim K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-10/msg00277.html (7,467 bytes)

71. Re: [Amps] Class A for AM (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 15 Nov 2006 01:06:50 -0700
I m confused as to how the number of responses with a given answer means that the answer is valid. The laws of physics are established by mother nature, not majority vote. You got a pretty definitiv
/archives//html/Amps/2006-11/msg00194.html (8,734 bytes)

72. Re: [Amps] 220 LINES (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 04 Feb 2007 09:42:17 -0800
potential, depending on where it is grounded. I measured 24 volts with a 500mA availability between neutral and ground at the last place I lived. The voltage varied with load on the housing estate -
/archives//html/Amps/2007-02/msg00042.html (8,142 bytes)

73. Re: [Amps] Old Power Cord (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Mar 2007 10:01:45 -0800
This is a VERY BAD thing to do. ALL grounds within a building, MUST, by LAW be BONDED together by a low impedance path (that means BEEFY, DEPENDABLE, and SHORT). This is a requirement because it is t
/archives//html/Amps/2007-03/msg00068.html (8,128 bytes)

74. Re: [Amps] Old Power Cord (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Mar 2007 10:13:52 -0800
As others have noted, there is no need for a neutral UNLESS the amplifier needs 120 volts from the power line. And it is ILLEGAL to take 120 volts between the equipment ground (green wire) and one of
/archives//html/Amps/2007-03/msg00070.html (8,410 bytes)

75. Re: [Amps] MOVs on HV PS (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Mar 2007 12:58:46 -0800
I haven't seen Tom's advice on this, but I strongly agree with it (for that matter, I almost never disagree with him on anything). If you live in an area that gets much lightning, I also recommend a
/archives//html/Amps/2007-03/msg00078.html (8,883 bytes)

76. Re: [Amps] Old Power Cord (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Mar 2007 13:05:29 -0800
It is in the electrical section of building codes for virtually all of the develope world, and these building codes carry the force of LAW (that is, they are adopted by local governments). There are
/archives//html/Amps/2007-03/msg00079.html (8,505 bytes)

77. [Amps] Alligators (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Mar 2007 13:16:39 -0800
While this post is slightly off the topic of amps, I can't think of a better place to post it. I belong to a contest club, and many of our members worked the ARRL SSB contest this past weekend. One o
/archives//html/Amps/2007-03/msg00082.html (7,963 bytes)

78. Re: [Amps] Alligators (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Mar 2007 14:20:54 -0800
I spent 50 of my 51 years as a ham in a city (mostly Chicago) on a tiny lot with low dipoles. For all but the last 3 years, I ran 100 watts. I really doubt that the QRM is a lot different between EU
/archives//html/Amps/2007-03/msg00092.html (8,287 bytes)

79. Re: [Amps] Old Power Cord (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Mar 2007 14:46:14 -0800
You're putting words in mouth -- I never suggested any such thing. I simply stated the requirements for GROUNDING. I'm stating my best understanding of the LAW. I'm really trying to be quite precise
/archives//html/Amps/2007-03/msg00095.html (9,970 bytes)

80. Re: [Amps] MOVs on HV PS (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Mar 2007 14:49:51 -0800
There is a MAJOR problem with this design. See the tutorial referenced earlier in this thread. The UL sticker says nothing more than that the components won't burn your house down if they are used pr
/archives//html/Amps/2007-03/msg00097.html (8,260 bytes)

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