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How good is ferrite 75 material for crystal AM radio?
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January 23rd 04, 07:37 PM
Fred Bartoli
Posts: n/a
"John Popelish" a écrit dans le message news:
...
beginner wrote:
I made an inductor by winding 14 turns on T82-75 torroid.
Using 180 pF variable capacitor, in a crystal radio circuit I could not
pick up any signal but even with a 470 uH modded inductor I picked up a
few
signals.
Is this material not suitable for this appication?
Thanks
I am not familiar with this core number, but if it is actually made of
Fair-Rite type 75 ferrite, it is not very good for making 1 MHz
inductors. It is low resistivity (acts as a loaded turn in parallel
with your inductance) and quite a bit of hysterisis loss. Are you
sure it is ferrite? Can you measure the contact resistance between
two points on the core with your ohm meter?
--
Whatever the material, a core shape is not well suited to pickup fields.
Instead, use an opened one, like ferrite sticks. Unfortunately you'll have
to have many more turns.
Fred.
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