Calculating uH for baluns.... - elmers Forum at eHam.net

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Calculating uH for baluns....	Reply
by KI6LNG on November 6, 2009	Mail this to a friend!
I'm trying to understand the theory and the calculations used for matching cores to turns to frequencies....... Can some of you guys point me in the right direction for these calculations? I'm sure it's pretty basic but after a few hours of search I have nothing to show for it. Thanks!

RE: Calculating uH for baluns....	Reply
by AD5LT on November 7, 2009	Mail this to a friend!
http://my.integritynet.com.au/purdic/basic-electronic-units.htm some good reading here'

RE: Calculating uH for baluns....	Reply
by W5DXP on November 7, 2009	Mail this to a friend!
This BK01-FLYER from Amidon contains a lot of good information: https://www.amidoncorp.com/items/55 -- 73, Cecil, w5dxp.com

RE: Calculating uH for baluns....	Reply
by K6AER on November 7, 2009	Mail this to a friend!
The inductance of a toroid depends on several factors. Wire size, number of turns, toroid permeability and to a degree the toroid size. Given all of that, I would suggest you buy the following books; Building and Using Baluns and Unins by Jerry Sevick and Ferromagnetic Core Design Application and Handbook by M.F. "Doug" DeMaw Both are excellent references and great guides in learning about toroid use.

RE: Calculating uH for baluns....	Reply
by W5FYI on November 7, 2009	Mail this to a friend!
I would suggest the Amidon web site, the ARRL Handbook,chapters 4 and 28 (I believe), and Jerry Sevick's books. You might also find what you're looking for by searching the "Search Elmers" window on this page. Be careful of what you find on the Internet, thought--some of the "expert" knowledge is bogus, even on eHam.

RE: Calculating uH for baluns....	Reply
by HFRF on November 7, 2009	Mail this to a friend!
<<<<<The inductance of a toroid depends on several factors. Wire size, number of turns, toroid permeability and to a degree the toroid size. Given all of that, I would suggest you buy the following books; Building and Using Baluns and Unins by Jerry Sevick and Ferromagnetic Core Design Application and Handbook by M.F. "Doug" DeMaw Both are excellent references and great guides in learning about toroid use.>>>>> The above answer is ridiculous. All you have to do is find the AL value associated with a specific toroid from Amidon, Fair Rite, or Micrometals. Simple formulas use the AL value to calculate turns that produce a certain inductance or calculate inductance when knowing the number of turns. For the formulas, go to: http://hfvhf.noip.us/al.pdf

RE: Calculating uH for baluns....	Reply
by KI6LNG on November 7, 2009	Mail this to a friend!
How can I calculate the inductance required to use with those formulas?

RE: Calculating uH for baluns....	Reply
by VK1OD on November 7, 2009	Mail this to a friend!
Rob, It helps to understand how a balun works. A balun in an antenna system has different requirements to a balun coupling stages inside a box of electronics. Practical baluns for HF antennas will often use a magnetic core of some kind. Powdered iron is regarded as superior by some, others have a deeper understanding and recognise that ferrites, even lossy ferrites can be optimal for the purpose. Lossy cores require treatment of the inductors as more than a pure inductance. Formulas based on Al typically regard permeability as constant, and the inductor as lossless. Permeability varies with frequency, expecially for lossy ferrites, a further reason why simplistic inductance based design is very limited, and permeability can be regarded as a complex quantity (ie real and imaginary parts) to account for core loss. Others have given you some references, some are regarded by some readers as bibles... but as you read widely, you may change your mind. Owen

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