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Old 12-31-2018, 05:03 AM
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spacecase0 spacecase0 is online now
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Join Date: Nov 2014
Posts: 366
velocity factor of black iron oxide ?

anyone know velocity factor of black iron oxide powder ?
I am trying to design something and can't seem to figure out how fast radio waves go through the iron oxide powder, like the kind you find in copy toner.
I know some of you have made your own transformer cores,
and hope someone already knows this answer.
I have searched the web for a few weeks now and just can't find the answer.
thinking about a frequency in the 146MHz range
but would be up for data for any frequency
seems like some of the ferrite cores might be similar, but not sure about that.
I just don't want to have to measure this for myself as I don't think I have the hardware to do it accurately.

Last edited by spacecase0; 12-31-2018 at 05:08 AM.
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Old 01-01-2019, 08:43 PM
RAMSET RAMSET is offline
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Join Date: Mar 2009
Location: NYC and Conn USA
Posts: 1,366
been asking around

Have had suggestions on how to check this on the bench
however as you most likely know the variables would be or could be an issue [quality data or ? inaccurate ?

still asking ,its a cool question IMO and actually fits [the answer]
with some other ideas and potential experiments.

Chet K
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Old 01-01-2019, 11:05 PM
mikrovolt mikrovolt is offline
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Absorbing can be related to Suppressing (EMI). Making epoxy bead, T-37 toroid with silicon mold as inductor or inverse relation
as suppressor with bead cylinder shape and very small toroids for quantitative measurements.
After 100 Mhz a typical ferrite bead stops being inductive and starts being resistive (heat).
Making a T-37 toroid with silicon mold as inductor or inverse relation as suppressor with cylinder shape.
Testing ferrite beads is shown in the video, filtering a spectral line or one of the frequency bands.
Murata application manual.

Also link below that in the section subtitled "Short history of ferrites." the soft magnetics in the lab proved to be elusive.
I think that might be something like the frequency vs impedance chart for ferrite ceramic cores. Epoxy cores is an interesting subject.


Last edited by mikrovolt; 01-02-2019 at 12:10 AM.
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