On Sat, 18 Dec 2004 09:14:14 -0700, Richard Zalewski wrote:
>I continue to do research on selecting the correct ferrite for HF RFI
>problems. What I have found so far is that it appears that Type 31
>material is best suited for 1-30 Mhz. This is not the usual 43 or 77
>material sold by most. 43 and 77 have a wider range but not the
>impedance in the 10mhz range as 31. Before I go order up a bunch of
>31 material stuff does anyone have any experience using 31 material?
I agree with your assessment. In general, you will achieve higher R over
the broadest frequency range in the HF spectrum with #31 than with 43,
44, 77, or 78. You can "tune" the peak attenuation by varying the number
of turns.
Jim Brown K9YC
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