rsgb_lf_group@blacksheep.org schrieb am 29.11.02 15:54:03:
G0MRF@aol.com wrote:
> A short note for any home constructors.
>
> Micrometals, producers of the popular T-200-2 and other toroids, have
> introduced a new series called the 200C series.
>
does anyone know of a table of equivalency between the Philips cores and
the Micrometal ones?
André N4ICK
Dear Andre,
there is no table of equivalency. Philips, Valvo, Ferroxcube (all the same company) produce ferrites, meanwhile Micrometals is manufacturing iron-powder cores.
Amidon ferrites You can also find at Fair-Rite in US, Amidon powder cores at Micrometals.
Have a look to the survey or selector chart in the manufacturer`s catalog to find out the fitting material for long-wave or short wave application.
As a rule of thumb is the material permeability is a hint for the desired frequency range.
urel = 80 f= 3...30 MHz 73kHz....3 MHz also possible
400...1000 f= 73 kHz....7 MHz
2700 f=20 kHz...300kHz
5000...10 000 Audio frequency
More upon request.
55,
Hans-Albrecht
DK 8 ND
for a
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