Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Wed, 28 May 2008 07:54:12 -0700
NO, it has become the TenTec Cheerleaders reflector -- better defined as a bunch of old farts, SOME of whom seem to be interested only in justifying their purchase of a particular radio, and not cari
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Wed, 28 May 2008 19:11:04 -0700
Marinus, If the shoe fits, wear it. I'm 66 years old. As a genuine old fart myself, I know one when I see one. :) 73, Jim _______________________________________________ TenTec mailing list TenTec@co
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 31 May 2008 08:59:42 -0700
Mostly these are surplus from 2-way and cell phone systems. There's nothing wrong with PL259 (UHF) connectors -- IF you buy good ones. On another list, I noted that most connectors sold to hams are j
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 31 May 2008 10:46:58 -0700
Switchcraft makes XLRs in "good, better, and best" quality levels. The "good" is just barely good. Better and best hold up fairly well. Yes Jim _______________________________________________ TenTec
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 31 May 2008 11:27:07 -0700
Newark and Allied are reliable distributors. Jim _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 02 Jun 2008 07:22:07 -0700
They're not the only very good engineers to have written negatively about this antenna. W8JI, another very good engineer, has also debunked the Double Bazooka. 73, Jim K9YC __________________________
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 02 Jun 2008 16:16:52 -0700
The late Dick Heyser once said that trying to describe the performance of an audio system using only the amplitude of the frequency response was like trying to write poetry with only one word in your
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Tue, 03 Jun 2008 14:13:29 -0700
Guys, I have an Omni V and Herc I for sale, both in very good shape. They work together. I'll sell together or separately. Omni V.9 has 217L (500 Hz) in 9 MHz IF, 282, 285, and 288 filters in 6.3 MHz
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Thu, 05 Jun 2008 11:44:55 -0700
YES! Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 06 Jun 2008 11:30:57 -0700
YES. And an even better match to 75 ohm coax if it's fairly high. :) 73, Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Fri, 06 Jun 2008 23:29:28 -0700
A clarification. Noise is picked up on ANY transmission line as a common mode current, and is coupled to the antenna if the antenna itself is unbalanced. The vast majority of REAL ham antennas have s
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 07 Jun 2008 15:15:34 -0700
So? They're VERY different antennas, and verticals ARE noisier. I'm talking the same antenna, not a different one. 73, Jim K9YC _______________________________________________ TenTec mailing list Ten
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 09 Jun 2008 15:41:22 -0700
See my tutorial for the discussion of chokes as "egg insulators" in feedlines to minimize their interaction with nearby antennas (especially verticals). That's a TERRIBLE place to get specs or to buy
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Mon, 09 Jun 2008 23:58:33 -0700
It defies logic to speak of materials as having a single-valued permeability. Permeability of ferrite materials is neither a real number nor constant with frequency. Fair-Rite publishes graphs of the
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Tue, 10 Jun 2008 10:58:04 -0700
I have, and my extensive publications on ferrite chokes for control of RFI and and for coaxial transmitting chokes ALL specify Fair-Rite toroids in specific sizes and materials. Moreover, my publicat
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Wed, 11 Jun 2008 09:12:12 -0700
I strongly recommend a decent 75 ohm transmitting coax (robust copper braid shield, UV-rated jacket) with a good multi-turn common mode choke wound around toroids. The obvious advantage is greatly re
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 14 Jun 2008 15:16:02 -0700
Ham antennas are unbalanced by their surroundings. Coax simply ADDS (algebraically) to that imbalance. I don't understand the question. The differential mode circuit through the coax is simply that l
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 14 Jun 2008 15:23:57 -0700
Hmmm. I'm a leftie. I tune the radio with my right hand and send CW with my left hand. I set the paddle on the left side of the computer, the radio on the right side. I don't understand the "handedne
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sat, 14 Jun 2008 22:34:27 -0700
Of course -- Antennas 101. But such matters should (and can easily) be taken into account when building the antenna and the lines that feed it. It seems trivial to me that someone smart enough to bui
Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Date: Sun, 15 Jun 2008 08:27:01 -0700
Well documented, it might be possible to turn your experience to bigger and better things. Tell the power company that the next time, you'll have the lightning target their executive suites! 73, Jim