Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 31 May 2010 13:19:38 -0700
Because it's a POOR fix for the fundamental problem, which is something wrong in the input circuit of the power amp causing a mismatch. The proper fix is to find and correct the problem in the input
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 31 May 2010 14:55:27 -0700
That's a difference of history. When tubes ruled, transceivers usually had tubes and tunable output stages. Modern transceivers use transistors and want to see 50 ohms. The buyer who doesn't play che
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 04 Jun 2010 23:49:12 -0700
I've never owned one, but my Hercules II runs quite well from any good solid power supply that puts out 14V at 80-90A. My first solution was a pair of Astron RS70s, each dedicated to half of the outp
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Tue, 08 Jun 2010 20:18:50 -0700
YES! Thank N8LP, a software engineer who has developed LP Bridge to do just that for the K3. I suspect it will also work with other rigs. It's FREE. I've sucessfully used it to let several programs t
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Wed, 09 Jun 2010 12:47:57 -0700
LP Bridge can be set to the speed you need. 73, Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sun, 13 Jun 2010 13:48:34 -0700
It's a squirrel cage fan that is easy to clean with Q-tips. I've done that with my Titans. I suggest you begin by doing that. It will also let you know what you're looking for. The critical factor, o
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 26 Jun 2010 23:24:15 -0700
I've used DXKeeper for about 7 years. It works great with LOTW, and it's free. 73, Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.cont
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 28 Jun 2010 15:21:00 -0700
That's not surprising. Everything I've ever seen of her has reinforced that view, including many examples of her doing nice things for little people, and taking sometimes taking political stances tha
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 02 Jul 2010 08:30:21 -0700
Are you a member of any local ham clubs? I'm a member of several here in CA, and each of them has at least one guy who can help with things like this. We help each other with lots of things, like ant
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 24 Jul 2010 23:42:25 -0700
IMO, Ten Tec's customer support policies and reputation were built by founder Al Kahn, K4FW, who, with Lou Burroughs, had founded ElectroVoice in the early 30s. EV's support was always golden when he
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 26 Jul 2010 10:43:55 -0700
Over most of my ham career, most of my antennas have been hung in trees. Here in CA, they're up 120 ft in redwoods. I've tried a lot of things. The best, by far, is the pneumatic tennis ball launcher
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 30 Jul 2010 23:23:28 -0700
http://audiosystemsgroup.com/RFI-Ham.pdf 73, Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Thu, 05 Aug 2010 13:13:32 -0700
I own five 229/238 tuners, and regularly run a Titan at 1.2-1.4kW into them. One or two of the fixed capacitors will release smoke after a long period of contest operation. Once I've replaced them wi
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Thu, 05 Aug 2010 21:47:24 -0700
It depends on lots of things, including the impedances being matched. I agree that the balun is a real weak sister. But since I don't like antennas fed with twinlead, I've never used it. 73, Jim K9YC
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 06 Aug 2010 10:02:49 -0700
coax stations First, let's call these things by their real name so that we understand what they do. They are COMMON MODE CHOKES, NOT BALUNS. As Jerry notes, the function of a common mode choke is to
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 06 Aug 2010 11:15:00 -0700
The only beads I know of that are suitable for HF are the tiny beads that W2DU found 30 years ago for his chokes. They only fit miniature coax, and it takes HUNDREDS of them to make a choke that stil
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 07 Aug 2010 00:41:35 -0700
Gerry, You need to study the fundamentals of how ferrite chokes work. IT IS NOT ABOUT PERMEABILITY. IT IS ABOUT RESISTIVE IMPEDANCE. Your analysis is badly mistaken. You need to study my tutorial. 73
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 07 Aug 2010 23:14:52 -0700
Hi Gary, What mod? 73, Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sun, 08 Aug 2010 10:05:30 -0700
You should visit the Fair-Rite website. That is NOT true of them. The front of the catalog (15MB as a pdf) shows plots of u' and u'' vs frequency for every material. The rest of the catalog consists
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sun, 08 Aug 2010 14:43:57 -0700
That's exactly right. The only thing they hurt is your pocketbook. And, as compared to turns wound around a ferrtie core, they also hurt by adding more weight. That's exactly right. The primary benef