I used to think that, but I was mistaken. #43 is NiZn, #31 is a very
special MnZn material. NiZn materials are relatively high-Q as compared
to #31, which is a very special MnZn formulation.
Once we realize that 1) #43 is designed for mid-to-high VHF to get
products through EMC testing; 2) Rs in a choke is far superior to Zmag,
3) much higher Rs values can be obtained by winding turns to move the
VHF resonance down to HF, and that the higher Q of the NiZn material
exacerbates tolerance issues, #31 is actually moderately superior to #43.
73, Jim K9YC
On 10/13/2021 11:43 AM, David Eckhardt wrote:
If it ever becomes a problem, again, 43 material would better serve
10-meters than 31 material. The difference is small, but if needed, it
could be useful.
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