Also the difference between Mix 31 and 43 is not great and was used for
decades successfully before 31 was introduced.
For a non-critical application like this almost anything would work with
enough core depth and/or turns, but they are not nearly the same. There is a
large difference between 43 and 31 material.
31 has an initial perm of 1500 and slopes down with increasing frequency,
with a Q of unity at around 3 MHz.
43 has an initial perm of 900 and slopes down at 1 MHz, with a Q of 1 at
around 15 MHz.
Both have a curie temp of around 130 C.
About half the permeability is not the same, and the Q=1 being five times
higher in frequency is certainly not the same. 31, with lower Q across
HF, is a significantly better suppression material.
_______________________________________________
Topband reflector - topband@contesting.com
