In this discussion two different ferrite mixes are mentioned: #31 and #61.
From the descriptions of these on the Fair-Rite web page, it appears that 31
would be more suitable for lower frequency applications. >>>>
Core selection can be fairly complex in transmitting systems. I've yet to
see a case where one core mix is the be all end all for the range of things
you run into in the field. Especially at high common mode impedances.
Receiving is a completely different story, because core stresses are always
low.
73 Tom
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