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261. Re: [Amps] construct ferrite "line isolator" (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 27 Oct 2010 10:45:54 -0700
Ah, but it's MUCH MORE than that. It is the improper termination of a cable SHIELD, NOT a GROUND connection. The EARTH has little to do with this problem. A rig running on a battery supply, with no c
/archives//html/Amps/2010-10/msg00417.html (11,635 bytes)

262. Re: [Amps] construct ferrite "line isolator" (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 27 Oct 2010 10:59:02 -0700
I forgot to mention that it is also often possible to find Pin 1 Problems in an active demo with a 2M and 440 talkie. I use a Kenwood TH-F6A. I key the radio off and on, moving it along the interconn
/archives//html/Amps/2010-10/msg00418.html (10,989 bytes)

263. Re: [Amps] Pin 1 (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 27 Oct 2010 16:34:04 -0700
That's exactly right. AES Standards call for the shield to go ONLY to pin 1 of a cable-mounted connector, but to for pin 1 of connectors within EQUIPMENT to go to the shielding enclosure. There are V
/archives//html/Amps/2010-10/msg00421.html (9,127 bytes)

264. Re: [Amps] construct ferrite "line isolator" (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 28 Oct 2010 04:41:52 -0700
When you wind a choke or transformer on Fair-Rite #61 or #67, you are depending on that core having low loss. How many times must I recommend that you STUDY THE FAIR-RITE CATALOG and STUDY MY TUTORIA
/archives//html/Amps/2010-10/msg00423.html (10,399 bytes)

265. Re: [Amps] use or not coaxial audio cable to transmitter's modulation? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 29 Oct 2010 09:14:39 -0700
I wrote those words, so I will try to help say it better. I'm sorry that my words are not clear enough. The words you are reading are written about audio cables with two wires inside the shield. Some
/archives//html/Amps/2010-10/msg00427.html (9,877 bytes)

266. Re: [Amps] use or not coaxial audio cable to transmitter's modulation? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 29 Oct 2010 12:11:47 -0700
Understood. But more questions. You say 500 watt transmitter. Most ham transmitters are 100W output, and if you want more power, you add a power amplifier. Is this a 500W transmitter all in one box,
/archives//html/Amps/2010-10/msg00430.html (8,223 bytes)

267. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 09 Nov 2010 20:16:04 -0800
I know this may come as a shock to some folks on this list, I know MANY honorable contesters, including some with big time reputations, who play by the rules. There are certainly some who think that
/archives//html/Amps/2010-11/msg00127.html (10,707 bytes)

268. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 09 Nov 2010 20:22:48 -0800
WONDERFUL! That gives the guys who play fair a better chance. 73, Jim K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li
/archives//html/Amps/2010-11/msg00128.html (9,606 bytes)

269. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 10 Nov 2010 13:04:24 -0800
Of course not -- only the laws of your country. 73, Jim K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-11/msg00142.html (8,475 bytes)

270. Re: [Amps] WTB RJ1A vacuum relay (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Sun, 14 Nov 2010 10:15:38 -0800
Gigavac sells their version of these relays to hams at good discounts (about $75 when I last bought about two years ago). One of the Alpha engineers told me that they've been using Gigavac for some t
/archives//html/Amps/2010-11/msg00214.html (7,912 bytes)

271. Re: [Amps] Attenuator needed (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 15 Nov 2010 13:50:18 -0800
Another downside to using an attenuator between the rig and the amp is that unless you provide bypass switching, it's still inline when you want to operate without the amp. W8JI has noted the importa
/archives//html/Amps/2010-11/msg00262.html (7,944 bytes)

272. Re: [Amps] Attenuator needed (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 16 Nov 2010 10:47:21 -0800
Very interesting, Uwe. Many thanks for the great work. It would be nice to have English text. Sadly, like most Americans, I have no German. 73, Jim K9YC ______________________________________________
/archives//html/Amps/2010-11/msg00267.html (8,652 bytes)

273. Re: [Amps] T-T Titan 425 Q's (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 02 Dec 2010 10:36:29 -0800
I own three Titan 425s of various vintages, all bought used. The differences between them are minor. The tubes can last a VERY long time if not abused, which mainly means keeping the grid current low
/archives//html/Amps/2010-12/msg00009.html (7,934 bytes)

274. Re: [Amps] W3NQN bandpass filters, question. (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 06 Dec 2010 12:43:26 -0800
It's important to remember that a filter is a passive network, and like ALL passive networks, its behavior depends on the source impedance and load impedance AT THE FREQUENCY OF INTEREST. Bench measu
/archives//html/Amps/2010-12/msg00042.html (8,228 bytes)

275. Re: [Amps] Fan for SB220 (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 17 Dec 2010 10:06:45 -0800
Tubes and transistors are like batteries in parallel, sort of. They contain an AC voltage or current generator that multiplies the AC input voltage or current by some number that is a function of the
/archives//html/Amps/2010-12/msg00191.html (9,420 bytes)

276. Re: [Amps] TenTec Centurion - 422 tuning question (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 23 Dec 2010 08:43:32 -0800
That's a good move. I also strongly suggest proceeding on the assumption that the amp works as designed, and that something is BROKEN. In addition to Carl's suggestion, I'd also look for a problem wi
/archives//html/Amps/2010-12/msg00316.html (8,634 bytes)

277. Re: [Amps] TenTec Centurion - 422 tuning question (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 23 Dec 2010 15:29:08 -0800
This seems to be the way Ten Tec power amps are set up. My Titans, vintage 1980, are also set up that way. So take the cover off and look at it! That's what I did. End of confusion. :) It's also quit
/archives//html/Amps/2010-12/msg00326.html (9,372 bytes)

278. Re: [Amps] TenTec Centurion - 422 tuning question (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 23 Dec 2010 18:02:41 -0800
Yeah, I wrote that badly. What I meant was the impedance of the line as it reflects the antenna at the other end. :) 73, Jim K9YC _______________________________________________ Amps mailing list Amp
/archives//html/Amps/2010-12/msg00331.html (9,276 bytes)

279. Re: [Amps] What to buy? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 28 Jan 2011 16:22:15 -0800
It's a discredit to the narrow focus of this list that no one has asked you how you want to use this amp, what else is in your station, what sort of operating you do, and so on. What bands? CW? SSB?
/archives//html/Amps/2011-01/msg00390.html (9,321 bytes)

280. Re: [Amps] What to buy? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Sat, 29 Jan 2011 10:12:32 -0800
Of course -- only a fool would argue otherwise! But antennas (and especially towers) aren't cheap -- I could buy a couple of the latest Alphas for what I've invested in antennas! And once you've done
/archives//html/Amps/2011-01/msg00401.html (8,886 bytes)

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