Is somewhere available a list of ferrite mixes indicating the frequency
where R=X?
73,
Martin, OK1RR
Dne 1.6.2015 v 17:31 Tom W8JI napsal(a):
You really need to do a single loop through the core windows and measure
the impedance with some sort of analyzer. Even an MFJ259B with a short
connection to the jack will work well for this.
If the resistance equals the reactance down somewhere around 2 MHz, it
is 73 material.
If R=X someplace much higher, you can be sure it is a different mix. The
Q=1 frequency, where R=X or where loss tangent crosses reactance, tells
you the material better than anything else you can do.
That is how I quickly sort unknown cores.
73 Tom
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