On 8/6/2014 8:31 AM, Carl wrote:
31 and 43 mix are the popular ones in the 2-30 MHz range for common
mode suppression; 31 wins at 160 and 80, but 43 is better in the 7-30
range.
I would amend that only to say that #31 and #43 are roughly equivalent
in the 5-15 MHz, range, #43 is slightly better above 15 MHz. #43 is a
bit less expensive than #31, but the cost difference disappears if you
buy #31 in quantity. My last group purchase of #31 2.4-in cores was for
1,100 pieces, about two years ago. We paid about $4.
Because #31 is so much better on 80 and 160, because it is more
broadband below 15 MHz, and because it remains effective through the HF
range, I long ago made the engineering decision to buy #31 in quantity
for ham HF applications. If I were ONLY working above 80M, I would look
at pricing on #43 in the quantities I needed.
73, Jim K9YC
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