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1. [Amps] RF in the Audio (score: 1): Author: "Robert Kirkland" <alpha76@triton.net>; Date: Fri, 23 Sep 2011 11:41:20 -0400; hi, There have been several posts on rf in the audio recently, this is for info, it happened to me. When I fired up my Ten-Tec Jupiter one morning the guys complained. Checking the TT diagram showed; /archives//html/Amps/2011-09/msg00154.html (7,322 bytes)
2. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 23 Sep 2011 14:38:26 -0700; It is generally a good thing to seriously choke all feedlines to keep common mode RF off of them. Not only does common mode current conduct into the shack and excite Pin One problems like you have de; /archives//html/Amps/2011-09/msg00155.html (7,859 bytes)
3. [Amps] RF in the Audio (score: 1): Author: "Robert Kirkland" <alpha76@triton.net>; Date: Fri, 23 Sep 2011 18:08:59 -0400; Jim, I think your quite right in "seriously choking off your feeders". But please tell me how to use toroids on a 600 ohm open wire line. tnx, Bob,w5pvr No virus found in this outgoing message. Check; /archives//html/Amps/2011-09/msg00156.html (7,093 bytes)
4. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 23 Sep 2011 15:27:53 -0700; Wind a bifilar choke using 12-14 bifilar turns of #12 THHN on a #31 2.4-in o.d. toroid. It introduces a small mismatch (Zo approx 100 ohms), but only about two feet of line. Photos and details in the; /archives//html/Amps/2011-09/msg00157.html (7,080 bytes)
5. Re: [Amps] RF in the Audio (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 23 Sep 2011 20:03:16 -0500; You don't wind your balanced feed on a torroid for crying out loud, a method I find preposterous, and probably subject to heating and loss; you employ a link coupled balanced tuner and float the bala; /archives//html/Amps/2011-09/msg00158.html (8,042 bytes)
6. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 23 Sep 2011 18:50:23 -0700; You may not have heard about the concept, but it works quite well. DX Engineering has done similar things, but don't publish it. I've done considerable work on the topic, and published both the theor; /archives//html/Amps/2011-09/msg00159.html (7,813 bytes)
7. Re: [Amps] RF in the Audio (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 23 Sep 2011 21:54:04 -0400; Run another line in parallel and call it "Pin One" _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-09/msg00160.html (7,004 bytes)
8. Re: [Amps] RF in the Audio (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 24 Sep 2011 09:31:44 -0400; is far from a perfect solution in a real world enviroment. What works in a lab doesnt mean its good elsewhere. Carl KM1H _______________________________________________ Amps mailing list Amps@contes; /archives//html/Amps/2011-09/msg00161.html (8,716 bytes)
9. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sat, 24 Sep 2011 08:18:22 -0700; If you think there's a difference between theory and practice, you don't know enough about one or the other. 73, Jim K9YC _______________________________________________ Amps mailing list Amps@contes; /archives//html/Amps/2011-09/msg00162.html (7,645 bytes)
10. Re: [Amps] RF in the Audio (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 24 Sep 2011 11:51:42 -0400; I believe it is you who is seriously lacking in much of anything away from the PC and test equipment. The average ham doesnt have a clue what is happening at any point along his OWL much less an appr; /archives//html/Amps/2011-09/msg00165.html (8,703 bytes)
11. Re: [Amps] RF in the Audio (score: 1): Author: "Mitch Cox" <ww4cox@embarqmail.com>; Date: Sat, 24 Sep 2011 12:47:40 -0400; Well I see nothing ever changes here. I have been watching this site for years and it seems that the resident Ogre is trying to spread his bitterness yet again this morning. I have watched as the sch; /archives//html/Amps/2011-09/msg00166.html (12,862 bytes)
12. Re: [Amps] RF in the Audio (score: 1): Author: Commander John <crazytvjohn@yahoo.com>; Date: Sat, 24 Sep 2011 10:32:58 -0700 (PDT); Hi Suggest you wind a choke with Mix 31 RF suppression cores using RG 8u or Equivalent. Place it between the tuner and the radio or Amplifier. I made one with 5 fair rite 2631803802 rf suppression c; /archives//html/Amps/2011-09/msg00167.html (9,412 bytes)
13. Re: [Amps] RF in the Audio (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sat, 24 Sep 2011 14:07:37 -0500; I may have missed something but I was unable to find any sort of common mode choke on the DX Engineering website, designed to be inserted in a near or perfectly balanced parallel wire feedline. I am; /archives//html/Amps/2011-09/msg00168.html (9,846 bytes)
14. Re: [Amps] RF in the Audio (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Sat, 24 Sep 2011 14:17:00 -0500; Rob, If you would agree that "balanced" feeds are never idea, then a common mode choke is going to be of benefit. And when you find one of those ideal balanced feed lines, let me know. I could use so; /archives//html/Amps/2011-09/msg00169.html (10,409 bytes)
15. Re: [Amps] RF in the Audio (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sat, 24 Sep 2011 16:39:41 -0400; while you are at it show me an ideal "common mode choke" or BALUN. 73 Bill wa4lav Rob, If you would agree that "balanced" feeds are never idea, then a common mode choke is going to be of benefit. And; /archives//html/Amps/2011-09/msg00170.html (11,608 bytes)
16. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sat, 24 Sep 2011 13:50:16 -0700; MANY of the DX Engineering so-called baluns are common mode chokes -- indeed, what is commonly called a "current balun" IS a common mode choke. Many DXE baluns that transform impedance are ARRAYS of; /archives//html/Amps/2011-09/msg00171.html (10,771 bytes)
17. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sat, 24 Sep 2011 14:04:39 -0700; The one of whom you speak reminds me of the observation that a certain guy had "a mind like a steel trap -- rusted shut." I long ago stopped wasting my time with folks like that. It's like arguing wi; /archives//html/Amps/2011-09/msg00172.html (9,679 bytes)
18. Re: [Amps] RF in the Audio (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sun, 25 Sep 2011 00:47:41 +0200; What for? Nobody would buy or need one. How could common mode current appear on a near or perfectly balanced parallel wire feedline? I may have missed something but I was unable to find any sort of c; /archives//html/Amps/2011-09/msg00173.html (8,484 bytes)
19. Re: [Amps] RF in the Audio (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 24 Sep 2011 19:35:48 -0400; There is certainly nothing new under the sun about a transmission line balun (I hope that you are not claiming discovery) but why anyone would want to connect one between an amp and a tuner is hard f; /archives//html/Amps/2011-09/msg00174.html (12,339 bytes)
20. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sat, 24 Sep 2011 16:55:32 -0700; Common mode current results from imbalance at either end of the feedline. Most ham antennas are unbalanced to at least some extent by their surroundings -- trees, buildings, sloping earth, sloping an; /archives//html/Amps/2011-09/msg00175.html (9,422 bytes)

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