Hi all,
I am always interested in toroid comments. I have been successfully cleaning
up a lot of my long-standing RFI problems with them. My question. Ignoring the
economics, as I have both types available, what would be the results of
stacking one each of type 43 and 77 toroids? Would this make a toroid with the
combined bandwidth of both and the combined choking impedance of both? And
would
this result be the same with the same two toroids in series? Type 31 material
seems like the ultimate weapon but doesn't seem to be readily available yet.
Terry Baxter/N6CW
In a message dated 3/21/05 10:53:58 PM Pacific Daylight Time,
W4EF@dellroy.com writes:
<< I just made some measurements
on a 2.4 inch O.D. type 31 Fair-Rite Products core that K9YC
sent me. 7 turns on this core will give you >1000 ohms choking
impedance from 1.8 to 30 MHz. My data shows that the
type 31 material is much better than type 77 material in the
same form factor (2.4 inch O.D. toroid). The impedance of
the type 77 material falls off pretty rapidly above 2 MHz,
whereas the 31 material seems to provide good series
impedance well past 30 MHz. >>
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