[Elecraft] OT: Ferrite Identification Question

jim jbollit at outlook.com
Sat Jun 6 11:48:47 EDT 2015


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:elecraft-bounces at mailman.qth.net] On Behalf Of Martin
Sent: Saturday, June 6, 2015 3:25 AM
To: elecraft at mailman.qth.net
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
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