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References: [ +from:rohre@arlut.utexas.edu: 1984 ]

Total 1984 documents matching your query.

281. Re: [TenTec] Orion 2 situation (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Mon, 01 Jul 2013 17:07:59 -0500
These days the production lifetime of semiconductors is extremely short compared to the life time for tube designs back in the day. When key integrated circuits or custom designed chips are no longer
/archives//html/TenTec/2013-07/msg00040.html (10,884 bytes)

282. Re: [TenTec] Tuner (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Mon, 08 Jul 2013 15:57:24 -0500
You are doing nothing wrong, the 3.8 MHz antenna is just too short to reach 3.5 MHz! You could add some loading wires on the ends of the dipole to work that part of the band, but it might affect the
/archives//html/TenTec/2013-07/msg00126.html (8,799 bytes)

283. Re: [TenTec] Tuner (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Mon, 08 Jul 2013 18:48:13 -0500
Hi there, You are candidate for my tip of the week. If you have a window in the shack on the same side as the rig/ desk, you simply need to run the window line, (insulated) under the sash and close t
/archives//html/TenTec/2013-07/msg00134.html (10,373 bytes)

284. Re: [TenTec] Tuner parallel line into the shack (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Tue, 09 Jul 2013 14:38:17 -0500
In place of cutting slit in your ceiling, simply drill two holes the spacing of the line and insert bolts long enough to protrude on both sides. If the ceiling is sheet rock you probably don't need a
/archives//html/TenTec/2013-07/msg00156.html (10,131 bytes)

285. Re: [TenTec] OCF antennas evolution (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Wed, 10 Jul 2013 15:11:03 -0500
Many hams have used some form of OCF antenna. Not all are horizontal. For example, My Gap Titan vertical is technically an OCF antenna, since electrically it is longer on one side of the feedpoint th
/archives//html/TenTec/2013-07/msg00195.html (13,004 bytes)

286. Re: [TenTec] Detecting unbalanced feed line currents (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Wed, 10 Jul 2013 15:19:44 -0500
With the line isolator(s), feed point balun, tight shield coax, etc., etc. You may not have much RF appearing on the Windom's coax at the shack. If you did, you might notice RF feedback in the radio'
/archives//html/TenTec/2013-07/msg00196.html (10,576 bytes)

287. Re: [TenTec] Tuner (RF feedback or CM) (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Wed, 10 Jul 2013 15:29:38 -0500
If you have feed line radiation with both a balun and cable isolator (coax isolator) in place you may have a faulty balun or isolator, or have them installed at a critical length for the band where y
/archives//html/TenTec/2013-07/msg00198.html (10,309 bytes)

288. Re: [TenTec] OCF antennas evolution (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Wed, 10 Jul 2013 16:15:00 -0500
thanks, and I feel the same about the IDEZ, Inverted Double Extended Zepps we built for our club's Field Day use. 5/8 legs, cut at 80m. One for CW end of band one for phone end. We use them more on 2
/archives//html/TenTec/2013-07/msg00201.html (10,124 bytes)

289. Re: [TenTec] OCF antennas evolution (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Wed, 10 Jul 2013 18:35:46 -0500
Rick, I am fine with loops also, even 270 foot or larger. Our club used up to 1024 foot horizontal loop for Field Days some years ago when we had a large sports field. Each year for several, we would
/archives//html/TenTec/2013-07/msg00207.html (12,151 bytes)

290. Re: [TenTec] OCF antennas evolution (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Wed, 10 Jul 2013 18:44:59 -0500
Tony, You are correct, the IDEZ as I named it, is the Inverted Double Extended Zepp, (a Zepp as an inverted Vee). One year as I was playing with gain wires for Field Day, I came up with the IDEA for
/archives//html/TenTec/2013-07/msg00208.html (10,519 bytes)

291. Re: [TenTec] OCF antennas evolution (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Thu, 11 Jul 2013 14:24:11 -0500
Some of us have also had good results with variations of the G5RV, using a stub of parallel llne and transitioning to Coax without a balun at that point. Varney in his original design, ran parallel l
/archives//html/TenTec/2013-07/msg00252.html (11,103 bytes)

292. Re: [TenTec] OT; Horizontal Loop Antennas (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Thu, 11 Jul 2013 14:47:52 -0500
Great stories Rick. Yes, four sided loops are better for the cases you mention of getting two major directions with a lobe. Our 3 sided loops were strictly a compromise to get out of the hot TX sun t
/archives//html/TenTec/2013-07/msg00255.html (10,606 bytes)

293. Re: [TenTec] OCF antennas evolution (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Fri, 12 Jul 2013 14:45:56 -0500
Wade and the group, Wade's antenna is very close to the 135 foot doublet, and that has been modeled and plotted by the late L. B. Cebik, whose collected antenna works are at www.cebik.com. He typical
/archives//html/TenTec/2013-07/msg00290.html (9,835 bytes)

294. Re: [TenTec] OCF antennas evolution (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Fri, 12 Jul 2013 15:29:50 -0500
To further amplify Rick's comments, an antenna that has gained popularity in USA in recent years, is a 40 odd foot high vertical for 80 and 160m work. One of our North TX hams published his versions
/archives//html/TenTec/2013-07/msg00293.html (9,760 bytes)

295. Re: [TenTec] OCF antennas evolution (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Fri, 12 Jul 2013 17:54:23 -0500
Folks, my sideline at work is being the only ex RFI/EMC specialist, so I still do a lot of the work I did full time for Southwest Research Institute's RFI group many years back. Whenever we were look
/archives//html/TenTec/2013-07/msg00297.html (11,614 bytes)

296. Re: [TenTec] OCF antennas evolution (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Mon, 15 Jul 2013 14:45:54 -0500
Mike, Let all know how your Double Bazooka antennas work out when you get them in action! 73, Stuart K5KVH
/archives//html/TenTec/2013-07/msg00322.html (10,261 bytes)

297. Re: [TenTec] equipment storage? (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Tue, 23 Jul 2013 17:02:10 -0500
Depends on your climate. I would not store anything in an uninsulated garage, (or attic) in the South and Southwest, nor in the North in Winter. You might do better putting rigs into styrofoam picnic
/archives//html/TenTec/2013-07/msg00346.html (9,183 bytes)

298. Re: [TenTec] equipment storage? (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Wed, 24 Jul 2013 15:35:31 -0500
As an long time fireman, I will mention something to hams needing to store things, or to display things. Heaven forbid you ever have a fire, but hot smoke and gases collect near the ceiling, and affe
/archives//html/TenTec/2013-07/msg00354.html (11,681 bytes)

299. Re: [TenTec] equipment storage? (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Wed, 24 Jul 2013 18:16:00 -0500
Likely, going to publications on line for "Fire Resistive Construction, Drywall" will show you the latest preferred thickness. Certainly, metal studs seem appealing but heavy timber actually lasts lo
/archives//html/TenTec/2013-07/msg00357.html (9,870 bytes)

300. Re: [TenTec] equipment storage? (score: 1)
Author: Stuart Rohre <rohre@arlut.utexas.edu>
Date: Thu, 25 Jul 2013 14:14:34 -0500
Thanks Al for asking about cinder block walls. They are more expensive than using thicker sheet rock frame wood construction, but you are right, they resist fires well. We had a garage and shop catch
/archives//html/TenTec/2013-07/msg00369.html (10,464 bytes)

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