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21. Re: [Amps] RF in the Audio (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sun, 25 Sep 2011 02:20:20 +0200; Hi Jim, That is not something new to me ;-)) But the question concerned that perfectly! balanced open feeder which certainly carries no common mode current. 73 Peter Common mode current results from; /archives//html/Amps/2011-09/msg00176.html (10,069 bytes)
22. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sat, 24 Sep 2011 21:07:04 -0700; Ah, but it DOES, because the feedline is part of a complete circuit. If the rest of the circuit is unbalanced, it causes current in the feedline to be unbalanced. That's why I do not use the words "b; /archives//html/Amps/2011-09/msg00181.html (8,845 bytes)
23. Re: [Amps] RF in the Audio (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sat, 24 Sep 2011 23:13:29 -0600; From Wikipedia: In telecommunications <http://en.wikipedia.org/wiki/Telecommunication> and professional audio <http://en.wikipedia.org/wiki/Professional_audio>, a *balanced line* or *balanced signal; /archives//html/Amps/2011-09/msg00182.html (9,501 bytes)
24. Re: [Amps] RF in the Audio (score: 1): Author: Tom Thompson <tlthompson@qwest.net>; Date: Sat, 24 Sep 2011 23:24:00 -0600; On second thought, if all the impedances are equal, the currents are equal but I doubt that can really occur in the real world. Tom W0IVJ _______________________________________________ Amps mailing; /archives//html/Amps/2011-09/msg00183.html (9,916 bytes)
25. Re: [Amps] RF in the Audio (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Sun, 25 Sep 2011 02:01:34 -0400; It's highly unlikely as open wire/ ladder line/ window line is highly sensitive to nearby objects. It could be a perfect balanced match at the antenna, and still end up unbalanced by the time it reac; /archives//html/Amps/2011-09/msg00184.html (12,726 bytes)
26. Re: [Amps] RF in the Audio (score: 1): Author: "Jeff Blaine" <keepwalking188@yahoo.com>; Date: Sun, 25 Sep 2011 01:15:44 -0500; Roger, you better keep your head down. I'm not sure who it will be (the G5RV crowd or the "open wire is perfect" crowd), but the chances of you meeting a bad ending from this statement is high! You a; /archives//html/Amps/2011-09/msg00185.html (13,442 bytes)
27. [Amps] RF in the Audio (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 24 Sep 2011 23:29:32 -0700; I HAVE inserted the bifilar chokes between the output of a Titan 425 and the antenna tuner and tested at 1.5kW keydown for several minutes from 1.8 MHz to 28MHz. At that point, the choke sees ONLY th; /archives//html/Amps/2011-09/msg00186.html (12,673 bytes)
28. [Amps] RF in the Audio (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 24 Sep 2011 23:48:20 -0700; Roger, you better keep your head down. I'm not sure who it will be (the G5RV crowd or the "open wire is perfect" crowd), but the chances of you meeting a bad ending from this statement is high! You a; /archives//html/Amps/2011-09/msg00187.html (8,500 bytes)
29. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 25 Sep 2011 00:10:47 -0700; Exactly. There is an excellent AES paper from 1994, published in the June 1995 Journal of the AES (Audio Engineering Society) by Bill Whitlock analyzing a balanced interface as a Wheatstone Bridge. T; /archives//html/Amps/2011-09/msg00188.html (10,803 bytes)
30. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 25 Sep 2011 00:12:24 -0700; Yes, that's the rub. :) Jim _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-09/msg00189.html (9,074 bytes)
31. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 25 Sep 2011 00:51:59 -0700; It was a TEST -- i wanted to know the extent of heating by a differential field, which turned out to be small. I don't use open wire line. Not bad, but BETTER would be a string two-turn chokes throug; /archives//html/Amps/2011-09/msg00190.html (13,071 bytes)
32. Re: [Amps] RF in the Audio (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 25 Sep 2011 00:55:19 -0700; I completely agree. When someone tells me they're using a G5RV (or a 43 ft vertical), I catalog them as "I'm a sucker who hasn't bothered to learn how antennas work, and fell for a good sales pitch."; /archives//html/Amps/2011-09/msg00191.html (8,109 bytes)
33. Re: [Amps] RF in the Audio (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Sun, 25 Sep 2011 05:19:44 -0400; 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-09/msg00192.html (15,177 bytes)
34. Re: [Amps] RF in the Audio (score: 1): Author: dalej <dj2001x@comcast.net>; Date: Sun, 25 Sep 2011 06:06:01 -0500; I can say for my own experience that this technique does work. I have a Palstar BT1500A double L network balanced line tuner and I added a choke balun as per your suggestion above, about 4 feet from; /archives//html/Amps/2011-09/msg00193.html (8,832 bytes)
35. Re: [Amps] RF in the Audio (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Sun, 25 Sep 2011 07:27:04 -0500; The perceived problem with parallel balanced feedline has nothing to do with the ability to achieve an acceptable balance in the system and everything to do with the way most hams use the line and ty; /archives//html/Amps/2011-09/msg00194.html (14,347 bytes)
36. Re: [Amps] RF in the Audio (score: 1): Author: "W5CUL" <w5cul@sbcglobal.net>; Date: Sun, 25 Sep 2011 10:21:58 -0500; Not to agree or disagree with any of the statements thus far on this subject, I would like to add a real-world application that does seem to be working fine with no RFI issues at legal limit. This is; /archives//html/Amps/2011-09/msg00195.html (17,732 bytes)
37. Re: [Amps] RF in the Audio (score: 1): Author: Commander John <crazytvjohn@yahoo.com>; Date: Sun, 25 Sep 2011 08:43:11 -0700 (PDT); I remember in a older handbook that inserting reactance in series with or across a open wire feeder near the tuner would change its properties to allow a antenna to tune where it did not tune before.; /archives//html/Amps/2011-09/msg00196.html (9,727 bytes)
38. Re: [Amps] RF in the Audio (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 25 Sep 2011 12:14:16 -0400; The last place I would insert a balun is at any point in a OWL fed antenna. Do the twists as have been the norm since the 30's and live with whatever unbalance remains. Since OWL theses days assumes; /archives//html/Amps/2011-09/msg00197.html (20,923 bytes)
39. Re: [Amps] RF in the Audio (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 25 Sep 2011 13:15:33 -0400; Does anyone make a real balanced line antenna tuner? No toroidal transformer. If I built one I would couple link couple the TX into a tank and link couple the output with a swinging link with Fariday; /archives//html/Amps/2011-09/msg00198.html (21,951 bytes)
40. Re: [Amps] RF in the Audio (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 25 Sep 2011 13:20:50 -0400; We can perhaps this forum to come up with some ideas on how to achieve a goal by new design instead of going back and forth with old ideas and currently available equipment. bill wa4lav _____________; /archives//html/Amps/2011-09/msg00199.html (22,716 bytes)

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