The best way to determine the core performance is to do what the manufacturer does.
Use an analyzer to look a Ui and U''i over frequency to get an idea of the material type. The 2nd best way is to wind a few turns to see what the Rs is over the frequency of interest. The best is to build an actual unit and measure the parameters listed above AND resonant frequencies of the unit. What you think is happening, most likely is not. The "wives" tale associated with the Ugly Balun is just that. Put an Ugly Balun on an analyzer, and very few would use them. Jim W6AIM -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of Martin Sent: Saturday, June 6, 2015 3:25 AM To: [email protected] Subject: Re: [Elecraft] OT: Ferrite Identification Question Elecrafters, If you have totally unknown toroids, this useful program should help: Download , copy to your favourite folder and run (linux users run it under wine). miniRingkernRechner.exe (miniToroidCalculator)from here: http://www.df7sx.de/?page_id=212 Read HELP Set your language , then klick on TOOLS. Measure ID OD and height of your toroid. Enter the data. Wind some windings of wire onto the toroid ,measure the inductance and enter the measured data. Now klick Unknown Toroids and take over the measured data from TOOLS. The program will not tell you the manufacturer or type, but it will tell you what you can expect from the toroid. With the knowledge of the calculated data you might now be able to identify the toroid by searching through manufacturers lists. There are other useful tools on this site, e.g. a dB-Calculator and a Coax Stub Calculator. Enjoy. -- Ohne CW ist es nur CB.. 73, Martin DM4iM ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
