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341. [TenTec] Need Switch for 229B (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Tue, 26 Oct 2010 16:10:03 -0700
The rear section of the center switch on my 229B has a melted wiper, so I need a replacement. Anyone have a tuner with good switch to sell? 73, Jim K9YC ______________________________________________
/archives//html/TenTec/2010-10/msg00341.html (7,223 bytes)

342. Re: [TenTec] Tuners (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Mon, 01 Nov 2010 10:44:43 -0700
I own two 229Bs and three 238s, and just sent a check to someone on this list to buy another 238. I've also owned a couple of Drake tuners, both 100W and 1kW models, one of the original LDG AT100s, a
/archives//html/TenTec/2010-11/msg00012.html (9,859 bytes)

343. [TenTec] Milt Sullivan, K8YDO SK RL Drake Chief Engineer (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Thu, 11 Nov 2010 20:59:09 -0800
//This was in today's ARRL Letter. Milton A. Sullivan Jr, ex-K8YDO, Former Chief Engineer at R. L. Drake (SK)Milton A. "Buddy" Sullivan Jr, ex-K8YDO, of Washington, DC -- the former chief engineer at
/archives//html/TenTec/2010-11/msg00140.html (8,984 bytes)

344. Re: [TenTec] 4229 Tuner Balun Replacement? (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Sat, 13 Nov 2010 09:21:39 -0800
Loss in ferrite chokes and in baluns wound with ferrites is NOT a function of HEAVY construction, but depends primarily on the characteristics of the ferrite material (the MIX), how the chokes are wo
/archives//html/TenTec/2010-11/msg00157.html (8,241 bytes)

345. Re: [TenTec] 4229 Tuner Balun Replacement? (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Sun, 14 Nov 2010 10:30:49 -0800
It has long been W7EL's contention that you CANNOT force balance in an antenna system by forcing voltage balance on the line, and I firmly agree with him. Balance in ANY circuit is defined by the bal
/archives//html/TenTec/2010-11/msg00170.html (10,790 bytes)

346. Re: [TenTec] 4229 Tuner Balun Replacement? (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Sun, 14 Nov 2010 10:38:52 -0800
I certainly agree with respect to loss, but the linear view is important from a dissipation point of view. I do a lot of measurements, mostly to understand and characterize some physical elements or
/archives//html/TenTec/2010-11/msg00171.html (9,605 bytes)

347. Re: [TenTec] 4229 Tuner Balun Replacement? (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Sun, 14 Nov 2010 12:10:58 -0800
I would start with a very practical test. Take the cover off and transmit high power through the existing balun for a while. Stop transmitting and feel the balun to see if it is hot. If it is not, yo
/archives//html/TenTec/2010-11/msg00178.html (9,358 bytes)

348. Re: [TenTec] 4229 Tuner Balun Replacement? (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Sun, 14 Nov 2010 12:20:37 -0800
There are two causes of feedline radiation/reception -- common mode current and conductor spacing. A common mode choke AT THE FEEDPOINT can essentially kill the radiation due to common mode current u
/archives//html/TenTec/2010-11/msg00180.html (10,406 bytes)

349. Re: [TenTec] 4229 Tuner Balun Replacement? (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Sun, 14 Nov 2010 17:04:06 -0800
That's the function of the additional choke as egg insulator -- to break the feedline into lengths (from a common mode point of view) where very little current can flow. 73, Jim K9YC ________________
/archives//html/TenTec/2010-11/msg00185.html (11,005 bytes)

350. Re: [TenTec] 4229 Tuner Balun Replacement? (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Sun, 14 Nov 2010 18:34:06 -0800
You have hit on the heart of the reason why I am so opposed to the use of the word "balun" to describe a half dozen different things that are very different from each other, and why I use the words "
/archives//html/TenTec/2010-11/msg00187.html (12,917 bytes)

351. Re: [TenTec] 4229 Tuner Balun Replacement? (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Mon, 15 Nov 2010 11:43:12 -0800
http://audiosystemsgroup.com/RFI-Ham.pdf contains a LOT of measured data. 73, Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contestin
/archives//html/TenTec/2010-11/msg00195.html (9,286 bytes)

352. Re: [TenTec] 4229 Tuner Balun Replacement? (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Mon, 15 Nov 2010 11:56:09 -0800
Thermal measurements are bit tough, but the very practical test of running power through the device under test and then feeling it for heat will tell you a lot, and requires no instrumentation beyond
/archives//html/TenTec/2010-11/msg00196.html (10,930 bytes)

353. Re: [TenTec] 4229 Tuner Balun Replacement? (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Mon, 15 Nov 2010 13:45:00 -0800
Good work, Steve, but I'd love to see this data plotted as curves with log R vs log f. Your discussion of the importance of R is also veyr good, I think you ought to reference my prior publication ab
/archives//html/TenTec/2010-11/msg00200.html (10,331 bytes)

354. Re: [TenTec] OT (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Wed, 17 Nov 2010 14:10:04 -0800
K1TTT is a great engineer, and there's a lot of great stuff on his website. BUT -- that is terrible advice. A coil of coax without a ferrite core makes a LOUSY choke. Study my RFI tutorial to underst
/archives//html/TenTec/2010-11/msg00240.html (7,497 bytes)

355. Re: [TenTec] OT (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Thu, 18 Nov 2010 15:16:37 -0800
Study what Steve and I have written independently about this. His on the link he posted recently, and mine in my RFI tutorial. There is no question that a high resistive impedance is a far better sol
/archives//html/TenTec/2010-11/msg00255.html (8,106 bytes)

356. Re: [TenTec] OT (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Fri, 19 Nov 2010 11:04:21 -0800
Exactly right. Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
/archives//html/TenTec/2010-11/msg00264.html (8,531 bytes)

357. Re: [TenTec] WTB - Power Supply for a OMNI 6 (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Fri, 19 Nov 2010 12:03:19 -0800
I've never understood the importance of a "matching power supply." Ten Tec gear is quite well designed, and runs just fine from any decent 12-14VDC source. Anything from an Astron linear supply to a
/archives//html/TenTec/2010-11/msg00266.html (9,496 bytes)

358. Re: [TenTec] OT (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Sat, 20 Nov 2010 09:26:59 -0800
I'm sorry to offend you, Rob, the the supposed effectiveness of a coil of coax as a feedline choke is another of those myths that, although based on a grain of truth, and although still preached in A
/archives//html/TenTec/2010-11/msg00276.html (8,525 bytes)

359. Re: [TenTec] Titan 425 Initial Tune-Up settings - high VSWR (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Wed, 24 Nov 2010 17:12:42 -0800
At some point, changes were made with the values of the capacitors around the bandswitch in the output stage. There is one less capacitor there than is shown in the manual. With the 3 Titan 425s I ow
/archives//html/TenTec/2010-11/msg00383.html (7,782 bytes)

360. Re: [TenTec] Titan 425 Initial Tune-Up settings - high VSWR (score: 1)
Author: Jim Brown <k9yc@audiosystemsgroup.com>
Date: Wed, 24 Nov 2010 21:15:25 -0800
That is exactly right. And doing that will also minimize grid current, which is the main factor in tube life. 73, Jim K9YC _______________________________________________ TenTec mailing list TenTec@c
/archives//html/TenTec/2010-11/msg00386.html (8,349 bytes)

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