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1. [TowerTalk] Voltage at feedpoint (score: 1): Author: "N2TK, Tony" <tony.kaz@verizon.net>; Date: Tue, 05 Jun 2007 16:00:33 -0400; Is there a simple way to calculate the voltage at the feedpoint? As an example, say I wanted to find out what kind of voltage I should expect at the feedpoint of a 40M dipole when it is being driven; /archives//html/Towertalk/2007-06/msg00098.html (7,101 bytes)
2. Re: [TowerTalk] Voltage at feedpoint (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 05 Jun 2007 13:39:35 -0700; The stress on the balun is due to IMBALANCE in your antenna, NOT due to SWR. See my tutorial on baluns. http://audiosystemsgroup.com/RFI-Ham.pdf Tom Rauch, W8JI, has also written about this. Jim Brow; /archives//html/Towertalk/2007-06/msg00099.html (6,885 bytes)
3. Re: [TowerTalk] Voltage at feedpoint (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 5 Jun 2007 17:03:49 -0700 (PDT); The stress on the balun is also due to the severe mismatch of a 40 meter dipole on 60 meters. This results in high currents and voltages for a given power. The currents and voltages are manageable at; /archives//html/Towertalk/2007-06/msg00105.html (8,574 bytes)
4. Re: [TowerTalk] Voltage at feedpoint (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Tue, 5 Jun 2007 19:55:45 -0600; Tony, I cant think of a simple way... I modeled it on Eznec and came up with a feedpoint Z of 22.37 -j442. From some software of my own, that Z with 50 watts applied will have a voltage = 661.65, cur; /archives//html/Towertalk/2007-06/msg00108.html (8,281 bytes)
5. Re: [TowerTalk] Voltage at feedpoint (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 06 Jun 2007 06:49:30 -0700; This would be true of a transformer balun, but not a choke balun. And most dipole baluns are choke baluns. Jim _______________________________________________ ________________________________________; /archives//html/Towertalk/2007-06/msg00110.html (7,383 bytes)
6. Re: [TowerTalk] Voltage at feedpoint (score: 1): Author: "Mark Robinson" <markrob@mindspring.com>; Date: Wed, 6 Jun 2007 10:07:35 -0400; Is it true to say that 4:1 baluns are not choke baluns and are therefore more prone to overload damage? Mark N1UK G3ZZM _______________________________________________ _______________________________; /archives//html/Towertalk/2007-06/msg00111.html (8,516 bytes)
7. Re: [TowerTalk] Voltage at feedpoint (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 06 Jun 2007 12:36:09 -0700; Yes Yes, the core of transformer balun carries the full transmitted power, while the core of a choke balun carries only the common mode current. Jim _______________________________________________ __; /archives//html/Towertalk/2007-06/msg00115.html (7,629 bytes)

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